Home Page About Mindat The Mindat Manual History of Mindat Copyright Status Who We Are Our Science Mindat Newsletter [Free Download]Contact Us

Donate to Mindat Sponsor a Page Corporate Sponsorship Sponsored Pages

Learning Center What Is a Mineral?The Most Common Minerals on Earth Information for Educators Mindat Articles Mindat Newsletter [Free Download]The Elements The Mineral Quiz

Search Form Minerals by Properties Minerals by Chemistry Mineral Visual Explorer Advanced Locality Search Random Mineral Random Locality Search by minID Minerals by Country Alphabetical Mineral Index Alphabetical Locality Search Mineral Association Search List of Countries Localities Near Me Photo Search Search Articles Search Glossary The Rock H. Currier Digital Library More Search Options

The Mindat Manual Add a New Photo Rate Photos Locality Edit Report Coordinate Completion Report Add Glossary Item

Minerals Petrology Fossils Meteorites Geologic Time

Mining Companies Statistics Mineral Museums Clubs & Organizations Mineral Shows & Events Device Settings Time Machine

Read Discussions Identification Request

Photo Search Photo Galleries Search by Colour Photo Colour Explorer New Photos Today New Photos Yesterday Members' Photo Galleries Past Photo of the Day Gallery Photography

Piemontite

A valid IMA mineral species - grandfathered

This page is currently not sponsored. Click here to sponsor this page.

Photos of Piemontite (201)Discuss Piemontite View 'Best Of' Article

Piemontite Gallery Search Photos of Piemontite

Edit Piemontite Add Synonym Edit CIF structures Clear Cache

Piemontite

Praborna Mine, Servette-Chuc mining complex, Saint-Marcel, Aosta Valley, Italy

Piemontite

Yuba Cañon, Peavine Peak, Peavine Mining District, Washoe County, Nevada, USA

Piemontite

Picuris District, Taos County, New Mexico, USA

Piemontite

Praborna Mine, Servette-Chuc mining complex, Saint-Marcel, Aosta Valley, Italy

Piemontite

Yuba Cañon, Peavine Peak, Peavine Mining District, Washoe County, Nevada, USA

Piemontite

Picuris District, Taos County, New Mexico, USA

Piemontite

Praborna Mine, Servette-Chuc mining complex, Saint-Marcel, Aosta Valley, Italy

Piemontite

Yuba Cañon, Peavine Peak, Peavine Mining District, Washoe County, Nevada, USA

Hide all sections | Show all sections

About PiemontiteHide

Flag of Piedmont, Italy

Formula:

(CaCa)(AlAlMn³⁺)O[Si₂O₇][SiO₄](OH)

Colour:

Red, red-violet, red-brown to reddish black

Lustre:

Vitreous

Hardness:

6 - 6½

Specific Gravity:

3.46 - 3.54

Crystal System:

Monoclinic

Member of:

Epidote Group > Epidote Supergroup

Name:

Piemontite was first described from the Prabornaz mine, Saint-Marcel, Aosta Valley (until 1946 Aosta Valley was a province of Piedmont), Italy in 1758 by Cronstedt as "röd Magnesia", and again as “Manganèse rouge” by Chevalier Napione in 1790. He also provided a chemical analysis. On the basis of Napione's chemical data, Haüy designated the substance as “Manganèse oxidé violet silicifère” in 1801. Cordier (1803) did a new analysis and acknowledged the similarities between piemontite and epidote and named the mineral “Èpidote manganésifere.” A name that was used both by German and English-speaking scientists (Manganepidot and manganesian epidote, respectively). Also, Haüy (1822) adopted the name “Èpidote manganésifere” in his grand work Traité de Minéralogie. Werner (1817) chose the name "Piemontischer Braunstein", which was shortened to piedmontite in 1853 by Kenngott, using the English name for the region. Today, the Italian spelling is used: piemontite.

Type Locality:

ⓘ Praborna Mine, Servette-Chuc mining complex, Saint-Marcel, Aosta Valley, Italy

"Piemontite" has two different uses: Piemontite (sensu stricto) is the mineral species described here, but informally "piemontite" may also refer incorrectly to deep red colored, Mn³⁺-bearing epidotes that are really varieties of the species epidote, and not strictly speaking piemontite. "Piemontites" rarely contain more than 40% of the piemontite molecule, so many "piemontites" in collections (and pictured here in Mindat) are really Mn-rich red varieties of epidote. (See for example: Ashley (1984), Kawachi et al. (1983), and Martin & Lombardo (1995).)

May be confused with namansilite.

Unique IdentifiersHide

Mindat ID:

3208

Long-form identifier:

mindat:1:1:3208:3

Similar NamesHide

Piemontite-(Pb)	A valid IMA mineral species	(CaPb)(AlAlMn³⁺)O[Si₂O₇][SiO₄](OH)
Piemontite-(Sr)	A valid IMA mineral species	(CaSr)(AlAlMn³⁺)O[Si₂O₇][SiO₄](OH)
Spiemontite	A rock subtype

IMA Classification of PiemontiteHide

IMA status:

Approved, 'Grandfathered' (first described prior to 1959)

IMA Formula:

Ca₂(Al₂Mn³⁺)(Si₂O₇)(SiO₄)O(OH)

Classification of PiemontiteHide

Strunz-mindat (2026):

9.BG.05a

9 : SILICATES (Germanates)
B : Sorosilicates
G : Sorosilicates with mixed SiO₄ and Si₂O₇ groups; cations in octahedral [6] and greater coordination

Dana 8th ed.:

58.2.1a.11

58 : SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
2 : Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in [6] and higher coordination; single and double groups (n = 1, 2)

Hey's CIM Ref.:

16.16.22

16 : Silicates Containing Aluminum and other Metals
16 : Aluminosilicates of Mn

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.

Symbol	Source	Reference for Standard
Pmt	IMA–CNMNC	Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43
Pmt	Whitney & Evans (2010)	Whitney, D.L. and Evans, B.W. (2010) Abbreviations for names of rock-forming minerals. American Mineralogist, 95, 185–187 doi:10.2138/am.2010.3371
Pie	The Canadian Mineralogist (2019)	The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download

Physical Properties of PiemontiteHide

Lustre:

Vitreous

Transparency:

Translucent, Opaque

Colour:

Red, red-violet, red-brown to reddish black

Streak:

Reddish

Hardness:

6 - 6½ on Mohs scale

Tenacity:

Brittle

Cleavage:

Perfect
Perfect on {001}
Poor on {100}

Fracture:

Irregular/Uneven

Density:

3.46 - 3.54 g/cm³ (Measured) 3.45 g/cm³ (Calculated)

Optical Data of PiemontiteHide

Type:

Biaxial (+)

RI values:

n_α = 1.725 - 1.756 n_β = 1.73 - 1.789 n_γ = 1.75 - 1.832

2V:

Measured: 50° to 86°, Calculated: 54° to 86°

Max. Birefringence:

δ = 0.025 - 0.076
Based on recorded range of RI values above.

Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.

Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.

Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.

Thickness: 30 µm Order divisions

Rotation:

Surface Relief:

Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).

This shows the grain boundary and Becke line effect under plane-polarised light, based on the contrast between this mineral's average refractive index and the mounting medium. It does not take into account mineral colouration.

Focus:

In focus

Interference Figure:

This shows the idealized biaxial acute bisectrix (Bxa) interference figure - the conoscopic view for a grain cut perpendicular to the acute bisectrix, using this mineral's 2V. The two small white dots mark the melatopes - the points where the two optic axes emerge - and are shown only when they fall within the field of view. The coloured bands are isochromatics, and the dark bands are isogyres.

Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.

Thickness: 30 µm

Stage rotation: 0°

Dispersion:

r > v strong

Pleochroism:

Visible

Comments:

X= light yellow, orange to pink
Y= pale violet to deep lavender
Z= pink to deep red

Chemistry of PiemontiteHide

Mindat Formula:

(CaCa)(AlAlMn³⁺)O[Si₂O₇][SiO₄](OH)

Element Weights:

Element	% weight
O	43.124 %
Si	17.469 %
Ca	16.619 %
Mn	11.391 %
Al	11.188 %
H	0.209 %

Calculated from ideal end-member formula.

Elements listed:

Al, Ca, H, Mn, O, Si - search for minerals with similar chemistry

Common Impurities:

Fe,Ti,Na,K,H₂O

Crystallography of PiemontiteHide

Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

Space Group:

P2₁/m

Cell Parameters:

a = 8.878(10) Å, b = 5.692(5) Å, c = 10.201(10) Å
β = 115.25°

Ratio:

a:b:c = 1.56 : 1 : 1.792

Unit Cell V:

466.24 Å³ (Calculated from Unit Cell)

Morphology:

Prismatic, bladed or acicular crystals.

Twinning:

{100} uncommon, lamellar

Crystal StructureHide

Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4

View
CIF File Best | x | y | z | a | b | c

Rotation
Stop | Start

Labels
Console Off | On | Grey | Yellow

Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure

ID	Species	Reference	Year	Locality	Temp (K)
0018299	Piemontite	Nagashima M, Armbruster T, Akasaka M, Minakawa T (2010) Crystal chemistry of Mn2+-, Sr-rich and REE-bearing piemontite from the Kamisugai mine in the Sambagawa metamorphic belt, Shikoku, Japan Journal of Mineralogical and Petrological Sciences 105 142-150	2010	Kamisugai mine, Sambagawa metamorphic belt, Shikoku, Japan	293
0016954	Piemontite	Nagashima M, Akasada M (2010) X-ray Rietveld and 57Fe Mossbauer studies of epidote and piemontite on the join Ca2Al2FeSi3O12(OH) - Ca2Al2MnSi3O12(OH) formed by hydrothermal synthesis American Mineralogist 95 1237-1246	2010	synthetic	293
0016953	Piemontite	Nagashima M, Akasada M (2010) X-ray Rietveld and 57Fe Mossbauer studies of epidote and piemontite on the join Ca2Al2FeSi3O12(OH) - Ca2Al2MnSi3O12(OH) formed by hydrothermal synthesis American Mineralogist 95 1237-1246	2010	synthetic	293
0006437	Piemontite	Bonazzi P, Garbarino C, Menchetti S (1992) Crystal chemistry of piemontites: REE-bearing piemontite from Monte Brugiana, Alpi Apuane, Italy European Journal of Mineralogy 4 23-33	1992	Monte Brugiana, Alpi Apuane, Italy	293
0006436	Piemontite	Bonazzi P, Garbarino C, Menchetti S (1992) Crystal chemistry of piemontites: REE-bearing piemontite from Monte Brugiana, Alpi Apuane, Italy European Journal of Mineralogy 4 23-33	1992	Monte Brugiana, Alpi Apuane, Italy	293
0006435	Piemontite	Bonazzi P, Garbarino C, Menchetti S (1992) Crystal chemistry of piemontites: REE-bearing piemontite from Monte Brugiana, Alpi Apuane, Italy European Journal of Mineralogy 4 23-33	1992	Monte Brugiana, Alpi Apuane, Italy	293
0006434	Piemontite	Bonazzi P, Garbarino C, Menchetti S (1992) Crystal chemistry of piemontites: REE-bearing piemontite from Monte Brugiana, Alpi Apuane, Italy European Journal of Mineralogy 4 23-33	1992	Monte Brugiana, Alpi Apuane, Italy	293
0003596	Piemontite	Nagashima M, Akasaka M (2004) An X-ray Rietveld study of piemontite on the join Ca2Al3Si3O12(OH) - Ca2Mn3+3Si3O12(OH) formed by hydrothermal synthesis American Mineralogist 89 1119-1129	2004		293
0003595	Piemontite	Nagashima M, Akasaka M (2004) An X-ray Rietveld study of piemontite on the join Ca2Al3Si3O12(OH) - Ca2Mn3+3Si3O12(OH) formed by hydrothermal synthesis American Mineralogist 89 1119-1129	2004		293
0003594	Piemontite	Nagashima M, Akasaka M (2004) An X-ray Rietveld study of piemontite on the join Ca2Al3Si3O12(OH) - Ca2Mn3+3Si3O12(OH) formed by hydrothermal synthesis American Mineralogist 89 1119-1129	2004		293
0003593	Piemontite	Nagashima M, Akasaka M (2004) An X-ray Rietveld study of piemontite on the join Ca2Al3Si3O12(OH) - Ca2Mn3+3Si3O12(OH) formed by hydrothermal synthesis American Mineralogist 89 1119-1129	2004		293
0003592	Piemontite	Nagashima M, Akasaka M (2004) An X-ray Rietveld study of piemontite on the join Ca2Al3Si3O12(OH) - Ca2Mn3+3Si3O12(OH) formed by hydrothermal synthesis American Mineralogist 89 1119-1129	2004		293
0003591	Piemontite	Nagashima M, Akasaka M (2004) An X-ray Rietveld study of piemontite on the join Ca2Al3Si3O12(OH) - Ca2Mn3+3Si3O12(OH) formed by hydrothermal synthesis American Mineralogist 89 1119-1129	2004		293
0003590	Piemontite	Nagashima M, Akasaka M (2004) An X-ray Rietveld study of piemontite on the join Ca2Al3Si3O12(OH) - Ca2Mn3+3Si3O12(OH) formed by hydrothermal synthesis American Mineralogist 89 1119-1129	2004		293
0003589	Piemontite	Nagashima M, Akasaka M (2004) An X-ray Rietveld study of piemontite on the join Ca2Al3Si3O12(OH) - Ca2Mn3+3Si3O12(OH) formed by hydrothermal synthesis American Mineralogist 89 1119-1129	2004		293
0003588	Piemontite	Nagashima M, Akasaka M (2004) An X-ray Rietveld study of piemontite on the join Ca2Al3Si3O12(OH) - Ca2Mn3+3Si3O12(OH) formed by hydrothermal synthesis American Mineralogist 89 1119-1129	2004		293
0003587	Piemontite	Nagashima M, Akasaka M (2004) An X-ray Rietveld study of piemontite on the join Ca2Al3Si3O12(OH) - Ca2Mn3+3Si3O12(OH) formed by hydrothermal synthesis American Mineralogist 89 1119-1129	2004		293
0003586	Piemontite	Nagashima M, Akasaka M (2004) An X-ray Rietveld study of piemontite on the join Ca2Al3Si3O12(OH) - Ca2Mn3+3Si3O12(OH) formed by hydrothermal synthesis American Mineralogist 89 1119-1129	2004		293
0001798	Piemontite	Bonazzi P, Menchetti S, Reinecke T (1996) Solid solution between piemontite and androsite-(La), a new mineral of the epidote group from Andros Island, Greece American Mineralogist 81 735-742	1996		293
0001203	Piemontite	Catti M, Ferraris G, Ivaldi G (1988) Thermal behavior of the crystal structure of strontian piemontite American Mineralogist 73 1370-1376	1988		293
0001202	Piemontite	Catti M, Ferraris G, Ivaldi G (1988) Thermal behavior of the crystal structure of strontian piemontite American Mineralogist 73 1370-1376	1988		293
0000191	Piemontite	Dollase W A (1969) Crystal structure and cation ordering of piemontite American Mineralogist 54 710-717	1969		293

CIF Raw Data - click here to close

data_global
_chemical_name_mineral 'Piemontite'
loop_
_publ_author_name
'Nagashima M'
'Armbruster T'
'Akasaka M'
'Minakawa T'
_journal_name_full 'Journal of Mineralogical and Petrological Sciences'
_journal_volume 105 
_journal_year 2010
_journal_page_first 142
_journal_page_last 150
_publ_section_title
;
 Crystal chemistry of Mn2+-, Sr-rich and REE-bearing piemontite from the
 Kamisugai mine in the Sambagawa metamorphic belt, Shikoku, Japan
;
_database_code_amcsd 0018299
_chemical_compound_source 'Kamisugai mine, Sambagawa metamorphic belt, Shikoku, Japan'
_chemical_formula_sum 'Ca1.3 Mn1.13 Sr.19 La.03 Ce.05 Nd.02 Al1.83 Fe1.11 Si3 O12.87 H.87'
_cell_length_a 8.8673
_cell_length_b 5.6747
_cell_length_c 10.1594
_cell_angle_alpha 90
_cell_angle_beta 114.719
_cell_angle_gamma 90
_cell_volume 464.371
_exptl_crystal_density_diffrn      3.914
_symmetry_space_group_name_H-M 'P 1 21/m 1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  'x,1/2-y,z'
  '-x,1/2+y,-z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
_atom_site_U_iso_or_equiv
CaAl   0.75740   0.75000   0.15270   0.59000   0.01570
MnAl   0.75740   0.75000   0.15270   0.41000   0.01570
CaA2   0.59500   0.75000   0.42469   0.71000   0.00870
SrA2   0.59500   0.75000   0.42469   0.19000   0.00870
LaA2   0.59500   0.75000   0.42469   0.03000   0.00870
CeA2   0.59500   0.75000   0.42469   0.05000   0.00870
NdA2   0.59500   0.75000   0.42469   0.02000   0.00870
AlMl   0.00000   0.00000   0.00000   0.72000   0.00850
MnMl   0.00000   0.00000   0.00000   0.17000   0.00850
FeMl   0.00000   0.00000   0.00000   0.77000   0.00850
AlM2   0.00000   0.00000   0.50000   1.00000   0.00880
AlM3   0.29990   0.25000   0.21930   0.11000   0.00960
MnM3   0.29990   0.25000   0.21930   0.55000   0.00960
FeM3   0.29990   0.25000   0.21930   0.34000   0.00960
Sil   0.34330   0.75000   0.04280   1.00000   0.01020
Si2   0.68900   0.25000   0.27570   1.00000   0.01030
Si3   0.18540   0.75000   0.31930   1.00000   0.00970
O1   0.23680   0.99270   0.03470   1.00000   0.01650
O2   0.30660   0.97820   0.35450   1.00000   0.01480
O3   0.80090   0.01430   0.33400   1.00000   0.01650
O4   0.05630   0.25000   0.13050   1.00000   0.01270
O5   0.04110   0.75000   0.14920   1.00000   0.01360
O6   0.07420   0.75000   0.41400   1.00000   0.01250
O7   0.51700   0.75000   0.17850   1.00000   0.01900
O8   0.53400   0.25000   0.32010   1.00000   0.02000
O9   0.61630   0.25000   0.09990   1.00000   0.02400
O10   0.08850   0.25000   0.43290   0.87000   0.01170
H10   0.03000   0.25000   0.32700   0.87000   0.05000
loop_
_atom_site_aniso_label
_atom_site_aniso_U_11
_atom_site_aniso_U_22
_atom_site_aniso_U_33
_atom_site_aniso_U_12
_atom_site_aniso_U_13
_atom_site_aniso_U_23
CaAl 0.02120 0.01280 0.01710 0.00000 0.01190 0.00000
MnAl 0.02120 0.01280 0.01710 0.00000 0.01190 0.00000
CaA2 0.00690 0.01240 0.00560 0.00000 0.00150 0.00000
SrA2 0.00690 0.01240 0.00560 0.00000 0.00150 0.00000
LaA2 0.00690 0.01240 0.00560 0.00000 0.00150 0.00000
CeA2 0.00690 0.01240 0.00560 0.00000 0.00150 0.00000
NdA2 0.00690 0.01240 0.00560 0.00000 0.00150 0.00000
AlMl 0.00900 0.00560 0.01030 -0.00050 0.00330 0.00040
MnMl 0.00900 0.00560 0.01030 -0.00050 0.00330 0.00040
FeMl 0.00900 0.00560 0.01030 -0.00050 0.00330 0.00040
AlM2 0.00860 0.00620 0.01190 -0.00020 0.00450 -0.00070
AlM3 0.00870 0.00820 0.00960 0.00000 0.00150 0.00000
MnM3 0.00870 0.00820 0.00960 0.00000 0.00150 0.00000
FeM3 0.00870 0.00820 0.00960 0.00000 0.00150 0.00000
Sil 0.01000 0.00890 0.01140 0.00000 0.00430 0.00000
Si2 0.01060 0.00840 0.01250 0.00000 0.00560 0.00000
Si3 0.01000 0.00970 0.01070 0.00000 0.00570 0.00000
O1 0.01800 0.00900 0.02600 0.00200 0.01200 0.00100
O2 0.01400 0.01600 0.01500 -0.00300 0.00700 -0.00100
O3 0.01300 0.00800 0.02200 0.00100 0.00100 0.00000
O4 0.01500 0.01100 0.01300 0.00000 0.00700 0.00000
O5 0.01200 0.01300 0.01500 0.00000 0.00500 0.00000
O6 0.01500 0.00900 0.01800 0.00000 0.01200 0.00000
O7 0.01600 0.01700 0.01600 0.00000 0.00100 0.00000
O8 0.01700 0.02500 0.02600 0.00000 0.01600 0.00000
O9 0.02800 0.03300 0.01400 0.00000 0.01100 0.00000
O10 0.01300 0.01000 0.01600 0.00000 0.01000 0.00000

Geological EnvironmentHide

Paragenetic Mode(s):

Paragenetic Mode	Earliest Age (Ga)
Stage 4a: Earth’s earliest continental crust	>4.4-3.0
20 : Acidic volcanic rocks
High-𝑇 alteration and/or metamorphism
31 : Thermally altered carbonate, phosphate, and iron formations
32 : Ba/Mn/Pb/Zn deposits, including metamorphic deposits

Geological Setting:

Greenschist to amphibolite grade regional metamorphism, metasomatised manganese deposits, low temperature hydrothermal veins.

Type Occurrence of PiemontiteHide

Type Locality:

ⓘ Praborna Mine, Servette-Chuc mining complex, Saint-Marcel, Aosta Valley, Italy

Place of Conservation of Type Material:

No designated type material.

Synonyms of PiemontiteHide

Piedmontite

Manganepidote (in part)

Other Language Names for PiemontiteHide

Dutch:Piemontiet

French:Epidote Manganèsifère

German:Piemontit
Piedmontit

Russian:Пьемонтит

Simplified Chinese:红帘石

Spanish:Piedmontita
Piemontita

Varieties of PiemontiteHide

Strontium-bearing Piemontite

A strontian variety of Piemontite.

Relationship of Piemontite to other SpeciesHide

Member of:

Epidote Group > Epidote Supergroup

Other Members of Epidote Group:

Clinozoisite	(CaCa)(AlAlAl)O[Si₂O₇][SiO₄](OH)	Mon. 2/m : P2₁/m
Epidote	(CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)	Mon. 2/m : P2₁/m
Epidote-(Sr)	(CaSr)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)	Mon. 2/m : P2₁/m
Hancockite	(CaPb)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)	Mon. 2/m : P2₁/m
Heflikite	(CaCa)(AlAlSc)O[Si₂O₇][SiO₄](OH)	Mon. 2/m : P2₁/m
Mukhinite	(CaCa)(AlAlV³⁺)O[Si₂O₇][SiO₄](OH)	Mon.
Niigataite	(CaSr)(AlAlAl)O[Si₂O₇][SiO₄](OH)	Mon. 2/m : P2₁/m
Piemontite-(Pb)	(CaPb)(AlAlMn³⁺)O[Si₂O₇][SiO₄](OH)	Mon. 2/m : P2₁/m
Piemontite-(Sr)	(CaSr)(AlAlMn³⁺)O[Si₂O₇][SiO₄](OH)	Mon. 2/m : P2₁/m
Tweddillite	(CaSr)(Mn³⁺AlMn³⁺)O[Si₂O₇][SiO₄](OH)	Mon. 2/m : P2₁/m
'Unnamed (Fe3+ analogue of Piemontite-(Pb))'	(CaPb)(Fe³⁺AlMn³⁺)O[Si₂O₇][SiO₄](OH)
'Unnamed (Fe3+-analogue of Piemontite)'	(CaCa)(Fe³⁺AlMn³⁺)O[Si₂O₇][SiO₄](OH)
'Unnamed (Fe3+-analogue of Piemontite-(Sr))'	(CaSr)(Fe³⁺AlMn³⁺)O[Si₂O₇][SiO₄](OH)
'Unnamed (Ga-analogue of Epidote)'	(CaCa)(AlAlGa³⁺)O[Si₂O₇][SiO₄](OH)

Forms a series with:

Epidote

Piemontite-Epidote Series

Common AssociatesHide

Associations Based on Photo Data:

43 photos of Piemontite associated with Quartz	SiO₂
23 photos of Piemontite associated with Braunite	Mn²⁺Mn³⁺₆(SiO₄)O₈
20 photos of Piemontite associated with Calcite	CaCO₃
16 photos of Piemontite associated with Roméite Group	A₂(Sb⁵⁺)₂O₆Z
11 photos of Piemontite associated with Epidote	(CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
9 photos of Piemontite associated with 'Thulite'	(Ca₂)(Al,Mn³⁺)₃(Si₂O₇)(SiO₄)O(OH)
6 photos of Piemontite associated with Albite	Na(AlSi₃O₈)
6 photos of Piemontite associated with 'Tungsten-powellite'	Ca(Mo,W)O₄
5 photos of Piemontite associated with Ardennite-(V)	Mn²⁺₄Al₄(AlMg)(VO₄)(SiO₄)₂(Si₃O₁₀)(OH)₆
5 photos of Piemontite associated with Grossular	Ca₃Al₂(SiO₄)₃

Related Minerals - Strunz-mindat Grouping Hide

9.BG.	Alumovesuvianite	Ca₁₉AlAl₄(Al₆Mg₂)(◻₄)◻[Si₂O₇]₄[(SiO₄)₁₀]O(OH)₉	Tet. 4/m : P4/n
9.BG.	Alnaperbøeite-(Ce)	Ca(Ce_2.5Na_0.5)(AlAl₂Al)[Si₂O₇][SiO₄]₃O(OH)₂	Mon. 2/m : P2₁/m
9.BG.	Zilbermintsite-(La)	(CaLa₅)(Fe³⁺Al₃Fe²⁺)[Si₂O₇][SiO₄]₅O(OH)₃	Mon. 2/m : P2₁/m
9.BG.	Aluminomacfallite	Ca₂Mn³⁺AlMn³⁺(SiO₄)(Si₂O₇)(OH)₃	Mon. 2/m : P2₁/m
9.BG.	Heflikite	(CaCa)(AlAlSc)O[Si₂O₇][SiO₄](OH)	Mon. 2/m : P2₁/m
9.BG.	Magnesiovesuvianite	Ca₁₉MgAl₄(Al₆Mg₂)(◻₄)◻[Si₂O₇]₄[(SiO₄)₁₀](OH)(OH)₉	Tet. 4/m : P4/n
9.BG.	Zoisite-(Pb)	(CaPb)(AlAlAl)O[Si₂O₇][SiO₄](OH)	Orth. mmm(2/m2/m2/m) : Pnma
9.BG.	Shuiskite-(Cr)	Ca₂Cr³⁺Cr³⁺₂[Si₂O₆OH][SiO₄](OH)₂O	Mon. 2/m : B2/m
9.BG.	Radekškodaite Group
9.BG.05	Dissakisite-(La)	(CaLa)(AlAlMg)O[Si₂O₇][SiO₄](OH)	Mon. 2/m : P2₁/m
9.BG.05	Manganiandrosite-(Ce)	(Mn²⁺Ce)(Mn³⁺AlMn²⁺)O[Si₂O₇][SiO₄](OH)	Mon. 2/m : P2₁/m
9.BG.05b	Dissakisite-(Ce)	(CaCe)(AlAlMg)O[Si₂O₇][SiO₄](OH)	Mon. 2/m : P2₁/m
9.BG.05b	Allanite-(Sm)	(CaSm)(AlAlFe²⁺)O[Si₂O₇][SiO₄](OH)	Mon. 2/m : P2₁/m
9.BG.05a	Hancockite	(CaPb)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)	Mon. 2/m : P2₁/m
9.BG.05	Dollaseite-(Ce)	(CaCe)(MgAlMg)F[Si₂O₇][SiO₄](OH)	Mon. 2/m : P2₁/m
9.BG.05a v	'Unnamed (Ga-analogue of Epidote)'	(CaCa)(AlAlGa³⁺)O[Si₂O₇][SiO₄](OH)
9.BG.05a	Clinozoisite	(CaCa)(AlAlAl)O[Si₂O₇][SiO₄](OH)	Mon. 2/m : P2₁/m
9.BG.05a	Epidote-(Sr)	(CaSr)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)	Mon. 2/m : P2₁/m
9.BG.05	Vanadoandrosite-(Ce)	(Mn²⁺Ce)(V³⁺AlMn²⁺)O[Si₂O₇][SiO₄](OH)	Mon. 2/m : P2₁/m
9.BG.05b	Vanadoallanite-(La)	(CaLa)(V³⁺AlFe²⁺)O[Si₂O₇][SiO₄](OH)	Mon. 2/m : P2₁/m
9.BG.05b	'Unnamed (Mg-analogue of Ferriallanite-(Ce))'	(CaCe)(Fe³⁺AlMg)O[Si₂O₇][SiO₄](OH)
9.BG.05b	Ferriallanite-(La)	(CaLa)(Fe³⁺AlFe²⁺)O[Si₂O₇][SiO₄](OH)	Mon. 2/m : P2₁/m
9.BG.05	Uedaite-(Ce)	(Mn²⁺Ce)(AlAlFe²⁺)O[Si₂O₇][SiO₄](OH)	Mon. 2/m : P2₁/m
9.BG.05a	Epidote	(CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)	Mon. 2/m : P2₁/m
9.BG.05	Tweddillite	(CaSr)(Mn³⁺AlMn³⁺)O[Si₂O₇][SiO₄](OH)	Mon. 2/m : P2₁/m
9.BG.05b	Åskagenite-(Nd)	(Mn²⁺Nd)(AlAlFe³⁺)O[Si₂O₇][SiO₄]O	Mon. 2/m : P2₁/m
9.BG.05	Piemontite-(Pb)	(CaPb)(AlAlMn³⁺)O[Si₂O₇][SiO₄](OH)	Mon. 2/m : P2₁/m
9.BG.05b	Allanite-(Ce)	(CaCe)(AlAlFe²⁺)O[Si₂O₇][SiO₄](OH)	Mon. 2/m : P2₁/m
9.BG.05b	Allanite-(La)	(CaLa)(AlAlFe²⁺)O[Si₂O₇][SiO₄](OH)	Mon. 2/m : P2₁/m
9.BG.05b	Allanite-(Y)	(CaY)(AlAlFe²⁺)O[Si₂O₇][SiO₄](OH)	Mon. 2/m : P2₁/m
9.BG.05b	Akasakaite-(Ce)	(CaCe)(AlAlMn²⁺)O[Si₂O₇][SiO₄](OH)	Mon. 2/m : P2₁/m
9.BG.05b	Manganiandrosite-(La)	(Mn²⁺La)(Mn³⁺AlMn²⁺)O[Si₂O₇][SiO₄](OH)	Mon. 2/m : P2₁/m
9.BG.05b	Akasakaite-(La)	(CaLa)(AlAlMn²⁺)O[Si₂O₇][SiO₄](OH)	Mon. 2/m : P2₁/m
9.BG.05b	Vanadoakasakaite-(La)	(CaLa)(V³⁺AlMn²⁺)O[Si₂O₇][SiO₄](OH)	Mon. 2/m : P2₁/m
9.BG.05	Khristovite-(Ce)	(CaCe)(MgAlMn²⁺)F[Si₂O₇][SiO₄](OH)	Mon. 2/m : P2₁/m
9.BG.05b	Ferriakasakaite-(La)	(CaLa)(Fe³⁺AlMn²⁺)O[Si₂O₇][SiO₄](OH)	Mon. 2/m : P2₁/m
9.BG.05	Ferriandrosite-(La)	(Mn²⁺La)(Fe³⁺AlMn²⁺)O[Si₂O₇][SiO₄](OH)	Mon. 2/m : P2₁/m
9.BG.05	'Androsite-(Ce)'	(Mn²⁺Ce)(AlAlMn²⁺)O[Si₂O₇][SiO₄](OH)
9.BG.05	Vielleaureite-(Ce)	Mn²⁺Ce(MgAlMn²⁺)(Si₂O₇)(SiO₄)F(OH)	Mon. 2/m : P2₁/m
9.BG.05	Ferriandrosite-(Ce)	(Mn²⁺Ce)(Fe³⁺AlMn²⁺)O[Si₂O₇][SiO₄](OH)	Mon. 2/m : P2₁/m
9.BG.05b	Ferriallanite-(Ce)	(CaCe)(Fe³⁺AlFe²⁺)O[Si₂O₇][SiO₄](OH)	Mon. 2/m : P2₁/m
9.BG.05b	'Unnamed (Mn3+-analogue of Ferriakasakaite-(Ce))'	(CaCe)(Mn³⁺AlMn²⁺)O[Si₂O₇][SiO₄](OH)
9.BG.05b	Vanadoakasakaite-(Ce)	(CaCe)(V³⁺AlMn²⁺)O[Si₂O₇][SiO₄](OH)	Mon. 2/m : P2₁/m
9.BG.05	Piemontite-(Sr)	(CaSr)(AlAlMn³⁺)O[Si₂O₇][SiO₄](OH)	Mon. 2/m : P2₁/m
9.BG.05	Niigataite	(CaSr)(AlAlAl)O[Si₂O₇][SiO₄](OH)	Mon. 2/m : P2₁/m
9.BG.05b	Ferriakasakaite-(Ce)	(CaCe)(Fe³⁺AlMn²⁺)O[Si₂O₇][SiO₄](OH)	Mon. 2/m : P2₁/m
9.BG.05b	Vanadoandrosite-(La)	Mn²⁺La(V³⁺AlMn²⁺)(Si₂O₇)(SiO₄)O(OH)	Mon. 2/m : P2₁/m
9.BG.05b	Allanite-(Nd)	(CaNd)(AlAlFe²⁺)O[Si₂O₇][SiO₄](OH)	Mon. 2/m : P2₁/m
9.BG.05b	'UM1989-32-SiO:AlCaFeHREE'	(Ca_0.5◻_0.5REE)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
9.BG.05a	Mukhinite	(CaCa)(AlAlV³⁺)O[Si₂O₇][SiO₄](OH)	Mon.
9.BG.05b	Manganiakasakaite-(La)	(CaLa)(Mn³⁺AlMn²⁺)O[Si₂O₇][SiO₄](OH)	Mon. 2/m : P2₁/m
9.BG.10	Zoisite	(CaCa)(AlAlAl)O[Si₂O₇][SiO₄](OH)	Orth. mmm(2/m2/m2/m) : Pnma
9.BG.15	Macfallite	Ca₂Mn³⁺₃(SiO₄)(Si₂O₇)(OH)₃	Mon. 2/m : P2₁/m
9.BG.15	Sursassite	Mn²⁺₂Al₃(SiO₄)(Si₂O₇)(OH)₃	Mon. 2/m : P2₁/m
9.BG.20	Pumpellyite-(Al)	Ca₂AlAl₂[Si₂O₆OH][SiO₄](OH)₂O	Mon. 2/m
9.BG.20	Shuiskite-(Mg)	Ca₂MgCr³⁺₂[Si₂O₆OH][SiO₄](OH)₂(OH)	Mon. 2/m
9.BG.20	Julgoldite-(Fe2+)	Ca₂Fe²⁺Fe³⁺₂[Si₂O₆OH][SiO₄](OH)₂(OH)	Mon. 2/m
9.BG.20	Okhotskite	Ca₂Mn²⁺Mn³⁺₂[Si₂O₆OH][SiO₄](OH)₂(OH)	Mon. 2/m
9.BG.20	Julgoldite-(Mg)	Ca₂MgFe³⁺₂[Si₂O₆OH][SiO₄](OH)₂(OH)	Mon.
9.BG.20	Poppiite	Ca₂V³⁺V³⁺₂[Si₂O₆OH][SiO₄](OH)₂O	Mon. 2/m : B2/m
9.BG.20	Julgoldite-(Fe3+)	Ca₂Fe³⁺Fe³⁺₂[Si₂O₆OH][SiO₄](OH)₂O	Mon.
9.BG.20	Pumpellyite-(Fe2+)	Ca₂Fe²⁺Al₂[Si₂O₆OH][SiO₄](OH)₂(OH)	Mon. 2/m
9.BG.20	Pumpellyite-(Fe3+)	Ca₂Fe³⁺Al₂[Si₂O₆OH][SiO₄](OH)₂O	Mon. 2/m
9.BG.20	Pumpellyite-(Mg)	Ca₂MgAl₂[Si₂O₆OH][SiO₄](OH)₂(OH)	Mon. 2/m
9.BG.20	Pumpellyite-(Mn2+)	Ca₂Mn²⁺Al₂[Si₂O₆OH][SiO₄](OH)₂(OH)	Mon. 2/m
9.BG.25	Ganomalite	Pb₉Ca₅Mn(Si₂O₇)₄(SiO₄)O	Hex. 6 : P6
9.BG.25	Wayneburnhamite	Pb₉Ca₆(Si₂O₇)₃(SiO₄)₃	Hex. 6 : P6
9.BG.30	Rustumite	Ca₁₀(Si₂O₇)₂(SiO₄)(OH)₂Cl₂	Mon. 2/m : B2/b
9.BG.35	Modraite	Ca₁₉Fe²⁺Al₄(Al₆Fe²⁺₂)(◻₄)◻[Si₂O₇]₄[(SiO₄)₁₀](OH)(OH)₉	Tet. 4/mmm(4/m2/m2/m) : P4/nnc
9.BG.35	Fluorvesuvianite	Ca₁₉Fe³⁺Al₄(Al₆Mg₂)(◻₄)◻[Si₂O₇]₄[(SiO₄)₁₀]O(F,OH)₉	Tet. 4/mmm(4/m2/m2/m) : P4/nnc
9.BG.35	Vesuvianite	Ca₁₉Fe³⁺Al₄(Al₆Mg₂)(◻₄)◻[Si₂O₇]₄[(SiO₄)₁₀]O(OH)₉	Tet. 4/mmm(4/m2/m2/m) : P4/nnc
9.BG.35	Milanriederite	(Ca₁₈[REE])Fe³⁺Al₄(Mg₄Al₄)(◻₄)◻[Si₂O₇]₄[(SiO₄)₁₀](OH)(OH)₉	Tet. 4/mmm(4/m2/m2/m) : P4/nnc
9.BG.35	Manaevite-(Ce)	(Ca₁₃Ce₄[H₂O]₂)Mg(Al₃Mg)(Mg₃Ti₃Fe³⁺₂)(◻₄)◻[Si₂O₇]₄[(SiO₄)₈(H₄O₄)₂]O(OH)₉	Tet. 4/mmm(4/m2/m2/m) : P4/nnc
9.BG.35	Hongheite	Ca₁₉Fe²⁺Al₄(Fe³⁺,Mg)₈(◻₄)B[Si₂O₇]₄[(SiO₄)₁₀]O(OH,O)₉	Tet. 4/mmm(4/m2/m2/m) : P4/nnc
9.BG.35	Wiluite	Ca₁₉MgAl₄(Al,Mg)₈(B,◻)₄◻[Si₂O₇]₄[(SiO₄)₁₀]O(O,OH)₉	Tet. 4/mmm(4/m2/m2/m) : P4/nnc
9.BG.35	Cyprine	Ca₁₉Cu²⁺Al₄(Al₆Mg₂)(◻₄)◻[Si₂O₇]₄[(SiO₄)₁₀](OH)(OH)₉	Tet. 4/m : P4/n
9.BG.35	Manganvesuvianite	Ca₁₉Mn³⁺Al₄(Al₆Mg₂)(◻₄)◻[Si₂O₇]₄[(SiO₄)₁₀]O(OH)₉	Tet. 4/m : P4/n
9.BG.40	Vyuntspakhkite-(Y)	(Y,Yb)₄Al_2.5-1.5(Si,Al)_1.5-2.5(SiO₄)₄O(OH)₇	Mon. 2/m : P2₁/c
9.BG.45	Dellaite	Ca₆Si₃O₁₁(OH)₂	Tric.
9.BG.50	Ferriperbøeite-(Ce)	CaCe₃(Fe³⁺Al₂Fe²⁺)[Si₂O₇][SiO₄]₃O(OH)₂	Mon. 2/m : P2₁/m
9.BG.50	Perbøeite-(La)	CaLa₃(AlAl₂Fe²⁺)[Si₂O₇][SiO₄]₃O(OH)₂	Mon. 2/m : P2₁/m
9.BG.50	Perbøeite-(Ce)	CaCe₃(AlAl₂Fe²⁺)[Si₂O₇][SiO₄]₃O(OH)₂	Mon. 2/m : P2₁/m
9.BG.50	Gatelite-(Ce)	CaCe₃(AlAl₂Mg)[Si₂O₇][SiO₄]₃O(OH)₂	Mon. 2/m : P2₁/c
9.BG.50	Ferriperbøeite-(La)	CaLa₃(Fe³⁺Al₂Fe²⁺)[Si₂O₇][SiO₄]₃O(OH)₂	Mon. 2/m : P2₁/m
9.BG.55	Västmanlandite-(Ce)	CaCe₃(MgAl₂Mg)[Si₂O₇][SiO₄]₃F(OH)₂	Mon. 2/m : P2₁/m
9.BG.60	Radekškodaite-(La)	(CaLa₅)(Al₄Fe²⁺)[Si₂O₇][SiO₄]₅O(OH)₃	Mon. 2/m : P2₁/m
9.BG.60	Radekškodaite-(Ce)	(CaCe₅)(Al₄Fe²⁺)[Si₂O₇][SiO₄]₅O(OH)₃	Mon. 2/m : P2₁/m

Other InformationHide

Health Risks:

No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for PiemontiteHide

mindat.org URL:

https://www.mindat.org/min-3208.html
Please feel free to link to this page.

Search Engines:

Look for Piemontite on Google

Look for Piemontite images on Google

Look for Piemontite on Bing

Look for Piemontite images on Bing

Look for Piemontite on DuckDuckGo

Look for Piemontite images on DuckDuckGo

Look for Piemontite in the Rock H. Currier Digital Library

External Links:

Look for Piemontite on Webmineral

Look for Piemontite on Wikipedia

Look for Piemontite on Mineralien Atlas

Raman and XRD data at RRUFF project

References and PDF downloads at RRUFF project

American Mineralogist Crystal Structure Database

Handbook of Mineralogy page PDF

Mineral Dealers:

Buy from D. Joyce minerals

References for PiemontiteHide

Reference List:

Cordier, L. (1803) Analyse du Mineral connu sous le nom de Mine de Manganese violet du Piemont, faite au Labratoire del'Ecole de Mines. Journal des mines: 13(74): 135-142.

Kenngott, A. (1853) Piemontit. in Das Mohs’sche Mineralsystem, Verlag und Druck (Wien): 74-75.

Short, Allan M. (1933) A chemical and optical study of piedmontite from Shadow Lake, Madera Co., California. American Mineralogist, 18 (11) 493-500

Marmo, V., Neuvonen, K.J., Ojanperä, P. (1959) The piedmontites of piedmont (Italy), Kajlidongri (India), and Marampa (Sierra Leone). Bulletin de la Commission Géologique de Findlande: 184: 11-20.

(1962) International Mineralogical Association: Commission on New Minerals and Mineral Names. Mineralogical Magazine and Journal of the Mineralogical Society, 33 (258) 260-263 doi:10.1180/minmag.1962.033.258.09

STRENS, R. G. J. (1964) Synthesis and Properties of Piemontite. Nature, 201 (4915). 175-176 doi:10.1038/201175a0

Strens, R. G. J. (1966) Properties of the Al–Fe–Mn epidotes. Mineralogical Magazine and Journal of the Mineralogical Society, 35 (275) 928-944 doi:10.1180/minmag.1966.035.275.04

Welin, E. (1969) Notes on the mineralogy of Sweden 6. X-ray powder data for minerals from Långban and the related mineral deposits of Central Sweden. Arkiv för Mineralogi och Geologi, 4 (6, nr 30). 499-541

Dollase, W. A. (1969) Crystal structure and cation ordering of piemontite. American Mineralogist, 54 (5-6) 710-717

(1980) International Mineralogical Association: Commission on New Minerals and Mineral Names. Mineralogical Magazine, 43 (332) 1053-1055 doi:10.1180/minmag.1980.043.332.17

KAWACHI, YOSUKE, GRAPES, RODNEY H., COOMBS, DOUGLAS S., DOWSE, MARTIN (1983) Mineralogy and petrology of a piemontite-bearing schist, western Otago, New Zealand. Journal of Metamorphic Geology, 1 (4) 353-372 doi:10.1111/j.1525-1314.1983.tb00280.x

Ashley, P. M. (1984) Piemontite‐bearing rocks from the Olary District, South Australia. Australian Journal of Earth Sciences, 31 (2) 203-216 doi:10.1080/08120098408729292

Akasaka, M., Sakakibara, M., Togari, K. (1988) Piemontite from the manganiferous hematite ore deposits in the Tokoro Belt, Hokkaido, Japan. Mineralogy and Petrology, 38 (2) 105-116 doi:10.1007/bf01164315

Catti, M., Ferraris, G., Ivaldi, G. (1989) On the crystal chemistry of strontian piemontite with some remarks on the nomenclature of the epidote group. Neues Jahrbuch für Mineralogie, Monatshefte: 1989: 357-366.

Bonazzi, Paola, Garbarino, Carlo, Menchetti, Silvio (1992) Crystal chemistry of piemontites: REE-bearing piemontite from Monte Brugiana, Alpi Apuane, Italy. European Journal of Mineralogy, 4 (1) 23-34 doi:10.1127/ejm/4/1/0023

Jiménez-Millán, Juan, Velilla, Nicolas (1993) Compositional variation of piemontites from different Mn-rich rock-types of the Iberian Massif (SW Spain) European Journal of Mineralogy, 5 (5) 961-970 doi:10.1127/ejm/5/5/0961

Bermanec, V., Armbruster, T., Oberhänsli, R. (1994) Crystal chemistry of Pb- and REE-rich piemontite from Nezilovo, Macedonia. Schweizerische mineralogische und petrographische Mitteilungen, 74. 321-328

Bonazzi, Paola, Menchetti, Silvio (1994) Structural variations induced by heat treatment in allanite and REE-bearing piemontite. American Mineralogist, 79 (11-12) 1176-1184

Martin, L. (1995) Museo Regionale Di Scienze Naturali: 13: 103-126.

Bonazzi, Paola, Menchetti, Silvio, Reinecke, Thomas (1996) Solid solution between piemontite and androsite-(La), a new mineral of the epidote group from Andros Island, Greece. American Mineralogist, 81 (5) 735-742 doi:10.2138/am-1996-5-620

Della Ventura, Giancarlo, Mottana, Annibale, Parodi, Gian Carlo, Griffin, William L. (1996) FTIR spectroscopy in the OH-stretching region of monoclinic epidotes from Praborna (St. Marcel, Aosta valley, Italy) European Journal of Mineralogy, 8 (4) 655-666 doi:10.1127/ejm/8/4/0655

Deer, W. A., Howie, R. A., Zussman, J. (1997) Rock-Forming Minerals (2nd ed.) Vol. 1b - Disilicates and Ring Silicates. The Geological Society.

Izadyar, J. (2000) Chemical compositon of piemontites and reaction relations of piemontite and spessartine in piemontite-quartz schists of central Shikoku, Sanbagawa metomorphic belt, Japan. Schweizerische mineralogische und petrographische Mitteilungen: 80(2): 199-211.

(2001) Piemontite. Handbook of Mineralogy. Mineralogical Society of America

Langer, K., Tillmanns, E., Kersten, M., Almen, H., Arni, R. K. (2002) The crystal chemistry of Mn³⁺ in the clino- and orthozoisite structure types, Ca₂M₃³⁺[OH|O|SiO₄|Si₂O₇]: A structural and spectroscopic study of some natural piemontites and “thulites” and their synthetic equivalents. Zeitschrift für Kristallographie - Crystalline Materials, 217 (11). 563-580 doi:10.1524/zkri.217.11.563.20780

Liebscher, A. (2004) Spectroscopy of Epidote Minerals, in Epidotes. Reviews in Mineralogy and Geochemistry, 56. Mineralogical Society of America. 125-170 doi:10.2138/gsrmg.56.1.125

Bonazzi, P., Menchetti, S. (2004) Manganese in Monoclinic Members of the Epidote Group: Piemontite and Related Minerals. In Reviews in Mineralogy and Geochemistry Vol. 56. Mineralogical Society of America. p.495-552. doi:10.2138/gsrmg.56.1.495

Armbruster, Thomas, Bonazzi, Paola, Akasaka, Masahide, Bermanec, Vladimir, Chopin, Christian, Gieré, Reto, Heuss-Assbichler, Soraya, Liebscher, Axel, Menchetti, Silvio, Pan, Yuanming, Pasero, Marco (2006) Recommended nomenclature of epidote-group minerals. European Journal of Mineralogy, 18 (5) 551-567 doi:10.1127/0935-1221/2006/0018-0551

NAGASHIMA, Mariko (2006) Hydrothermal syntheses of epidote and piemontites on the join Ca2Al2Fe3+Si3O12(OH)-Ca2Al2Mn3+Si3O12(OH) at relatively low pressures of 200-400 MPa. Journal of Mineralogical and Petrological Sciences, 101 (1) 1-9 doi:10.2465/jmps.101.1

Izadyar, J. (2007) The analysis of paragenesis of Mn-Silicate bearing quartzites and schists in highly oxidized blueschist facies by Korzhinsky and Schrienemakers. Methods. Journal of Sciences, Islamic Republic of Iran: 18(3): 239-251.

NAGASHIMA, Mariko, ARMBRUSTER, Thomas, AKASAKA, Masahide, MINAKAWA, Tetsuo (2010) Crystal chemistry of Mn2+-, Sr-rich and REE-bearing piemontite from the Kamisugai mine in the Sambagawa metamorphic belt, Shikoku, Japan. Journal of Mineralogical and Petrological Sciences, 105 (3) 142-150 doi:10.2465/jmps.090709

Nagashima, M., Akasaka, M. (2010) X-ray Rietveld and 57Fe Mössbauer studies of epidote and piemontite on the join Ca2Al2Fe3+Si3O12(OH)-Ca2Al2Mn3+Si3O12(OH) formed by hydrothermal synthesis. American Mineralogist, 95 (8-9). 1237-1246 doi:10.2138/am.2010.3418

NAGASHIMA, Mariko, SANO, Yuko, KOCHI, Takako, AKASAKA, Masahide, SANO–FURUKAWA, Asami (2020) Crystal chemistry of Sr–rich piemontite from manganese ore deposit of the Tone mine, Nishisonogi Peninsula, Nagasaki, southwest Japan. Journal of Mineralogical and Petrological Sciences, 115 (5) 391-406 doi:10.2465/jmps.191122

Localities for PiemontiteHide

Showing 339 localities.

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the

symbol to view information about a locality. The

symbol next to localities in the list can be used to jump to that position on the map.

Hide all sections | Show all sections

Locality ListHide

- This locality has map coordinates listed.

- This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality.

- Good crystals or important locality for species.

- World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). ~~Struck out~~ - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.


Algeria
Skikda Province Azzaba District Es Sebt ⓘ Djebel Guettara Mn deposit	Heflik (1989)

Antarctica


Argentina
Córdoba Province Sierra de Córdoba El Pilón complex ⓘ Tamain quarries	Rapela et al. (2002)

Australia
Queensland Gympie Region Amamoor Creek ⓘ Amamoor Mine	Brooks (1962)
North Burnett Region Mount Biggenden ⓘ Biggenden Mine	Edraki et al. (2025)
South Australia Pastoral Unincorporated Area Bimbowrie Conservation Park ⓘ Old Boolcoomata Station	Noble et al. (1983)
ⓘ White Rock Feldspar Mine	Bosworth et al. (2001)
Iron Knob ⓘ Iron Monarch Main Pit	Francis (2010)

Austria
Salzburg Tamsweg District Tweng ⓘ Fuchs Alp - Fuchs lake area	Kolitsch et al. (2015) +3 other references
ⓘ Radiolarite outcrop (incl. Gfrererloch)	Strasser (1989)
ⓘ Lagler	Kolitsch et al. (2025)
ⓘ Lapernigspitze	Kolitsch et al. (2025)
Zell am See District Bramberg am Wildkogel Larmkogel ⓘ West slope	Strasser (1989)
ⓘ West slope of Schafkopf	Exel (1993)
Hollersbach im Pinzgau Scharnbachgraben ⓘ Achsel Alp mine	Strasser (1989)
Kaprun Mooserboden reservoir ⓘ Mooser dam	Strasser (1989)
Maishofen Forsthof ⓘ Diabase outcrops	Strasser (1989)
Tyrol Innsbruck-Land District Navis ⓘ Navis stream (Navis creek) ?	Kolitsch et al. (2019)
Obernberg am Brenner ⓘ Obernberger Tribulaun	Kolitsch et al. (2018)
Lienz District Kals am Großglockner Kals valley ⓘ Ködnitz valley	Neinaveie (1979)
Prägraten am Großvenediger Timmelbach valley ⓘ Wunwand (Wunspitze)	Kolitsch et al. (2019)
Schwaz District Gerlos ⓘ Grund hut (Grund huts)	Schmidegg (1963) +1 other reference
Schönach valley ⓘ Plattenscharte - Mitterkopf area	Lapis 34 (7-8)
Zillertal ⓘ Gerlos valley	Exel (1993)

Belgium
Wallonia Liège ⓘ Lienne valley	Schreyer et al. (1986) +2 other references
Luxembourg Vielsalm Salmchâteau ⓘ Le Coreux	Kramm (1979) +1 other reference

Canada
British Columbia Golden Mining Division ⓘ Ice River Alkaline Complex
Québec Abitibi-Témiscamingue Témiscamingue RCM ⓘ Rémigny armenite occurrence	Sabina (2000) +1 other reference

Chile
Antofagasta El Loa Province San Jose ⓘ Tuina Mine (Tuina SX-EX Copper Mine)	Robert Jenkins
Coquimbo Elqui Province La Serena Talcuna mining district ⓘ Balcanes Mine	Oyarzun et al. (1998)
ⓘ Placetas Mine	Oyarzun et al. (1998)
Limarí Province Fragua district ⓘ Fragua mine	C. Ruiz Fuller/F. Peebles (1988)

China
ⓘ Hainan	Mingsheng Peng et al. (1982)
Qinghai Haibei Tibetan Autonomous Prefecture Qilian Co. ⓘ Qingshuigou	Yong-Jiang Liu et al. (2006)
Sichuan Ngawa Autonomous Prefecture (Aba Autonomous Prefecture) Heishui Co. Hongyan ⓘ Hongyan Mn deposit	Chengzhong Zhang and Zengda Liu (2006)
ⓘ Xugu Mn deposit	Bing Zhou et al. (2007)

Finland
North Karelia Joensuu ⓘ Valkeavaara	Hyvärineb

France
Auvergne-Rhône-Alpes Savoie Saint-Jean-de-Maurienne Bessans ⓘ Le Coin	Chopin (1978)
Bonneval-sur-Arc ⓘ Ouille du Midi	Chopin (1978) +1 other reference
Brittany Morbihan Lorient Groix Primiture ⓘ Les Saisies	Chauris (2014)
Occitanie Ariège Foix Artigues ⓘ Laurenti Lake ?	Christian Berbain collection
Saint-Girons Seix Salau ⓘ Anglade Mine	Zahm (1987)
Pyrénées-Orientales Céret Prats-de-Mollo-la-Preste ⓘ Costabonne mines (Costabona mines)	Dubru. M (1986)
Provence-Alpes-Côte d'Azur Var Toulon Le Pradet ⓘ Cap Garonne Mine ?	David Hospital collection +1 other reference

Germany
Bavaria Lower Bavaria Freyung-Grafenau District Saldenburg Matzersdorf ⓘ Krenn Quarry	Habel (2000) +1 other reference
Passau District Tittling Tittling Hötzendorf ⓘ Granodiorite quarries (incl. Kusser Quarry)	Weiß (1990)
Lower Franconia Aschaffenburg District Haibach Dörrmorsbach ⓘ Stahl quarry	Wittern (2001)
Hesse Darmstadt Bergstraße Bensheim Auerbach ⓘ Linck marble works	Weiß (1990)
Darmstadt-Dieburg Mühltal Nieder-Ramstadt Kirchberg ⓘ Manganese mines	Weiß (1990)
Lower Saxony Goslar District Harz (Landkreis Goslar) ⓘ Huneberg Quarry	Baumgärtl (2014)
Schleswig-Holstein Dithmarschen Buchholz ⓘ Gravel pit Lucht	Wittern (2001)

Greece
Attica East Attica Lavreotiki ⓘ Lavrion Mining District	FITROS et al. (2014)
Marathon ⓘ Varnavas	Stouraiti et al. (2022) +1 other reference
Central Greece Euboea ⓘ Chalcis	Michael Samouhos specimen
ⓘ Karystos	Brian Kosnar
ⓘ Myloi (Myli)	Pasero et al. (1991)
Eastern Macedonia and Thrace Thasos ⓘ Kathares	Vason et al. (1993)
Theologos ⓘ Trikorfo	Su +17 other references
South Aegean Andros Vasiliko Mountain ⓘ Apikia	Reinecke et al. (1991)
ⓘ Vourkoti	Reinecke et al. (1985)
ⓘ Vitali Mine	Reinecke (1982) +1 other reference
Syros-Ermoupoli Syros Gria Spilia ⓘ Palos Hill	Altherr et al. (2013)

India
Jharkhand East Singhbhum District Jadugora ⓘ Narwapahar–Garadih–Turamdih–Nandup Sector U-deposits	Dhana Raju (2019)
Madhya Pradesh Jabalpur Division Chhindwara District ⓘ Gowari Wadhona Mine	Roy et al. (1968) +1 other reference
Jhabua District ⓘ Kajlidongri Mine	Fermor et al. (1906) +1 other reference
Maharashtra Nagpur Division Bhandara District ⓘ Sitasaongi mine	Bilgrami (1955)
West Bengal Purulia District ⓘ Manbazar gondites	Mukherjee et al. (1975) +1 other reference

Iran
Sistan and Baluchestan Province Zahedan County Dehoo ⓘ Dehoo manganese deposit	Lotfi et al. (2017)

Italy
Aosta Valley Fénis Clavalité Valley ⓘ Chez Botz (Chez Boche)	Castello (1981) +2 other references
Nus Saint-Barthélemy ⓘ Varenche Mine	Pelloux (1946) +2 other references
Rhêmes-Notre-Dame Rifugio Gian Federico Benevolo (Rifugio Benevolo) ⓘ Piemontite occurrence	Alessandro Cantamessa collection
Saint-Marcel ⓘ Servette-Chuc mining complex	Martin et al. (2004)
ⓘ Praborna Mine (TL)	[var: Strontium-bearing Piemontite] Das Mohs'sche Mineralsystem +1 other reference
Valtournenche Breuil-Cervinia ⓘ Motta di Pletè	Piccoli et al. (2007)
ⓘ Plan Tendre	Piccoli et al. (2007)
ⓘ Plateau Rosa Pass	Piccoli et al. (2007)
ⓘ Cignana Lake (Tsignanaz Lake)	Piccoli et al. (2007)
Calabria Cosenza Province Mormanno ⓘ Monte Cerviero mines (Mormanno mines)	Sinisi et al. (2018)
Liguria Genoa Genoa Varenna Valley ⓘ Case Scotti	Antofilli et al. (1983)
Ne ⓘ Cassagna Mine	Redazionale (2005)
ⓘ Molinello Mine	Balestra (2016)
Reppia ⓘ Gambatesa Mine	Redazione (2005)
Statale ⓘ Scrava Mine (Statale Mine)	Castellaro et al. (2023)
La Spezia Province Borghetto di Vara ⓘ Cerchiara Mine	Palenzona et al. (1988)
Maissana Monte Alpe ⓘ Monte Alpe Mine	Castellaro et al. (2011)
Savona Province Magliolo ⓘ Costa Balzi Rossi	Castellaro-Kampf
Lombardy Sondrio Province Lanzada ⓘ Scerscen Valley
ⓘ Lower Scerscen Glacier	Bedogné et al. (1993)
Torre di Santa Maria ⓘ Val Sora manganese outcrop	Bedogné et al. (1993)
ⓘ Val Sora Quarry	G.Guicciardi : Guida ai minerali della Val Malenco (1980)
Piedmont Cuneo Province Bellino ⓘ Maniglia Mt. Mine	Piccoli et al. (2007) +1 other reference
Pontechianale ⓘ Lago Blu	Piccoli (2002) +1 other reference
Metropolitan City of Turin Ceres ⓘ Vernetto Mine	Zambonini (1922) +1 other reference
Voragno ⓘ Ladant	Maletto et al. (2014)
ⓘ Monte di Voragno manganese occurrence	Piccoli et al. (2007)
Corio ⓘ Colle Forcola	Piccoli et al. (2007)
ⓘ Rio Bana	Piccoli et al. (2007)
Lanzo Valleys Mezzenile ⓘ Rio Cenere	Deidda et al. (2022)
Mattie ⓘ Sant'Anna	Franchi (1897)
Mezzenile ⓘ Catelli	Piccoli et al. (2007) +1 other reference
ⓘ Mompantero	Pognante (1983)
Pragelato Troncea Valley ⓘ Beth Mine (Beth-Ghinivert deposit)	Piccoli et al. (2007)
ⓘ Sparone	Barresi et al. (2007)
ⓘ Apparè	M.E. Ciriotti +1 other reference
ⓘ Feilongo	Pognante et al. (1988)
ⓘ Rio dei Piani	M.E. Ciriotti (05/04/2008)
Usseaux ⓘ Vallone dei Morti (Gran Serin)	Piccoli et al. (2007)
Usseglio ⓘ Punta Chestassa	Deidda et al. (2022)
Viù ⓘ Biolay	Giovanni Fraccaro collection
ⓘ Col San Giovanni	Piccoli et al. (2007)
ⓘ Punta Gensane	Piccoli et al. (2007)
Verbano-Cusio-Ossola Province Valstrona Forno ⓘ Ravinella di Sotto Mine	Savia et al. (2023)
Vercelli Province ⓘ Alagna Valsesia	Piccoli et al. (2007)
Otro Valley ⓘ Feglierec Mine	Bonino A. (1965) +1 other reference
Sardinia Sassari Province Calangianus ⓘ Furru e Conca Quarries	Orlandi (2011)
Tuscany Lucca Province Stazzema ⓘ Mount Corchia	Battaglia S. et al. (1977)
ⓘ Vagli Sotto	Biagioni C. (Alpi Apuane, Lucca)
ⓘ Arnetola Valley	Biagioni C. (Alpi Apuane, Lucca)
ⓘ Castagnola	Biagioni C. (Alpi Apuane, Lucca)
ⓘ Eremo di San Viano	Biagioni C. (Alpi Apuane, Lucca)
Massa-Carrara Province Carrara Monte Brugiana north slope ⓘ Monte Brugiana manganese mineralisation (Artana Mn deposit; Monte Brugiana - La Rocchetta)	Bonazzi et al. (1992)

Japan
Ehime Prefecture Iyo district Tobe-cho ⓘ Furumiya mine	Nakagawa et al. (2009)
Niihama City Besshi ⓘ Besshi mine (Bessi mine)	Introduction to Japanese Minerals (Geological Survey of Japan, 1970) +1 other reference
Ikadazu ⓘ Piemontite exposure	Tsuboi (1936)
Ouzu City ⓘ Kamisugai mine	Fukushima et al. (2005) +2 other references
ⓘ Mt Kannan	Nishio-Hamane et al. (2016) +1 other reference
Saijo City ⓘ Kamogawa (Kamo river)	MINAKAWA et al. (1987)
Shikokuchuo City Doi ⓘ Irazuyama (Iratsuyama)	Introduction to Japanese Minerals (Geological Survey of Japan, 1970) +1 other reference
Iyomishima ⓘ Sarutagawa (Sarutasawa)	- (n.d.)
ⓘ Sazare mine	- (n.d.)
Gunma Prefecture Fujioka City ⓘ Tsukiyoshi ?	Ohe Rikosha specimens
Hokkaidō Prefecture Okhotsk Subprefecture Kitami City ⓘ Kokuriki mine	Togari et al. (1987)
Iwate Prefecture Kuji City Yamagata ⓘ Takamatsu mine	- (n.d.)
Kanagawa Prefecture Hadano City ⓘ Dainichi mine	Mineralogical Journal Vol. 17 (1994)
Kochi Prefecture Agawa District Ino ⓘ Kamoyama mine	Nishio-Hamane et al. (2016)
ⓘ Asemi-gawa River area	Masaki Enami (1986)
Nankoku city Ananai mine ⓘ Fukinaro deposit	Nakagawa et al. (2009)
ⓘ Honomori deposit	Nakagawa et al. (2009)
ⓘ Nagakawara deposit	Nakagawa et al. (2009)
Nagasaki Prefecture Nagasaki City Kinkai-Tone-machi ⓘ Tone mine	Masutomi Museum specimens +3 other references
Nishisonogi District ⓘ Muramatsu-mura	Mem. Fac. Sci. et al. (1957)
Saitama Prefecture Chichibu City ⓘ Oyahana	- (n.d.)
Chichibu District ⓘ Nagatoro	- (n.d.) +1 other reference
ⓘ Arakawa River	Yano et al. (2027)
ⓘ Sanbagawa metamorphic belt	Banno (2000) +1 other reference
Shimane Prefecture Ochi District ⓘ Dohgamaru mine	Chihiro Fukuda and Masahide Akasaka (2005)
Tokushima Prefecture ⓘ Hakuryu mine	MINAKAWA et al. (1987)
Tokushima City ⓘ Bizan (Otakiyama)	Masutomi Museum specimens +1 other reference
ⓘ Otakiyama manganese deposit	Sadanaga et al. (1974)
Yoshinogawa City ⓘ Yamakawa-cho	Yuuki Hasegawa specimen
Yamaguchi Prefecture Iwakuni City ⓘ Nishiki-cho	Nishimura (1971)
Yamanashi Prefecture Minami-Alps City Kohsai ⓘ Ochiai mine	Kato et al. (1981)

Kazakhstan
Akmola Region Bulandy District ⓘ Raigorodok deposit	Kovalev et al. (2018)
Ulytau Region Karazhal ⓘ Ushkatyn deposits (Ushkatan)	Evseev (1995)

Kosovo
Ferizaj District Štrpce (Shtërpcë) ⓘ Brezovica	ABRAHAM et al. (1976)

Morocco
Drâa-Tafilalet Region ⓘ Bou Azzer mining district	Leblanc et al. (1988)
Zagora Province Agdz Cercle Tansifte Caïdat ⓘ Tachgagalt Mine	FAVREAU G. & DIETRICH J.E. (2006)

New Zealand
Otago Region Queenstown-Lakes District Arrow Junction ⓘ Arrow Junction Quarry	C. Lemanski (6782CL) +1 other reference
Arrow River (Arrow Valley) ⓘ Manganese occurrences	Hutton (1957)
West Coast Region Westland District ⓘ Haast River	Cooper (1971)

North Macedonia
Čaška Municipality ⓘ Nežilovo	Estep (1977) +1 other reference
Jakupica Mountains Babuna Valley ⓘ Babunaite-(Nd) type locality	Galuskina et al. (2026)
ⓘ Kalugeri Hill	Bermanec et al +2 other references
Prilep Municipality ⓘ Vitolište	Altherr et al. (2017)

Norway
Agder Birkenes Herefoss ⓘ Unnamed pegmatite	Morton et al. (1963) +1 other reference
Bykle ⓘ Hovden	Larsen (1978)
ⓘ Breivevatnet Pump Station	Knut Edvard Larsen collection # MM-3779
ⓘ Hovdenuten manganese deposit	Nordrum et al. (1981) +1 other reference
Grimstad Landvik ⓘ Hafsåsen	Neumann (1985)
Innlandet Lom Otta River ⓘ Søre Lia Quarry	Raade (1972) +2 other references
Skjåk Dønfoss ⓘ Øyberget Hydropower Station	Garmo (2006)
Stange ⓘ ~~Orrkjølen~~	Garmo et al. (2017) +1 other reference
Møre og Romsdal Kristiansund ⓘ Frei	Garmo et al. (2017)
Nordland Hamarøy ⓘ Sørfjord I Hydropower Station	Garmo et al. (2017)
Østfold Halden Fjell ⓘ Korsetgangen Mine ?	Hansen (1985)
Rogaland Lund Heskestad ⓘ ~~Askekor~~	Morton et al. (1963)
Sandnes Seldal ⓘ Piemontite occcurrence	Knut Edvard Larsen collection # 726 (analyzed, Tony Doré pers.com May 1985)
Telemark Hjartdal Sauland Kleppan ⓘ Øvstebø	Neumann et al. (1955)
Tokke Botnedal ⓘ Brandsnuten manganese deposit	van der Wel (1999)
Tjostolvflaten ⓘ Roadcut near Tjostolvflaten	Garmo et al. (2017)
Trøndelag Indre Fosen Leksvik Hindremseter ⓘ Leksvik Thulite Quarry	Nordrum (2005)
Oppdal ⓘ Åmotsdalen	Witsø (1995)
ⓘ Lønset	Witsø (1995)
Orkland Snillfjord Åstfjorden ⓘ ~~Mjønes Tunnel~~	Størseth (2019) +1 other reference
Vestland Luster Ornes ⓘ Piemontite locality	Dalen et al. (2008)

Poland
Lower Silesian Voivodeship Kłodzko County Gmina Bystrzyca Kłodzka ⓘ Marcinków ?	Lis et al. (1986)
Zgorzelec County Gmina Zgorzelec ⓘ Zgorzelec ?	Lis et al. (1986)

Romania
Caraş-Severin County Brebu ⓘ Delineşti deposit	Hîrtopanu et al. (2003)
Maramureș County Târgu Lăpuș ⓘ Răzoare	Udubasa et al. (1996) +1 other reference

Russia
Bashkortostan ⓘ Bikkulovskoe deposit	Brusnitsyn et al. (2009)
Sibay ⓘ Yuzhno-Faizulinskoe Mn deposit (South Faizuly deposit; South Faizulino deposit)	Brusnitsyn (2006)
Khakassia (Republic of Khakassia) Askizsky Rayon Askiz ore district ⓘ Chapsordag deposit	Kassandrov et al. (2009)
ⓘ Malosyrsky deposit	Kassandrov et al. (2009)
Khanty-Mansi Autonomous Okrug Berezovo district Saranpaul ⓘ Dodo Mine	Burlakov (1995)
Komi Republic Kozhim River Basin Maldynyrd range (Maldy-nyrd range) ⓘ Al'kesvozh river canyon (Al'kes-vozh)	Pavel M. Kartashov (n.d.)
ⓘ Chudnoe Pd-Au deposit	Pavel M. Kartashov (n.d.)
Grubependity Lake ⓘ Grubependity Lake cirque	Pavel M. Kartashov (n.d.)
ⓘ Sakha	[World of Stones 12:49]
Tyumen Oblast Tel'pos-Iz Mt ⓘ Nyarta-Syu-Yu River	Pekov (1998)
Ural Mountains ⓘ Polar Urals	Hyršl (1992)

Slovakia
Košice Region Spišská Nová Ves District Rudňany ⓘ RHV-1 borehole	Myšľan et al. (2026)

South Africa
Gauteng City of Tshwane Metropolitan Municipality ⓘ Mamelodi Quarry	Wilson
Limpopo Mopani District Municipality Ba-Phalaborwa Local Municipality Murchison Range Gravelotte ⓘ Consolidated Murchison Mines	Jako Schonken Collection
ⓘ Murchison Mine	Jako Schonken specimen
Vhembe District Municipality Musina Local Municipality ⓘ Musina	Cairncross (1991)
ⓘ Messina Mine	Cairncross et al. (1995)
Northern Cape John Taolo Gaetsewe District Municipality Joe Morolong Local Municipality Hotazel ⓘ Hotazel Mine	Wilson et al. (1978)
ⓘ Wessels Mine	Cairncross et al. (1995)
ZF Mgcawu District Municipality Tsantsabane Local Municipality Postmasburg ⓘ Kolomela Mine	Kumba Iron Ore
ⓘ Unnamed borehole	Costin et al. (2014) +1 other reference

Spain
Andalusia Huelva Los Marines ⓘ Sierra de Aracena	Jiménez-Millán et al. (1993) +1 other reference
Málaga ⓘ Ojén	www.lrz.de (n.d.)
Canary Islands Santa Cruz de Tenerife Province Tenerife Granadilla de Abona ⓘ ~~La Mareta~~	Dill et al. (2023)

Sweden
Gävleborg County Ljusdal ⓘ Los
Norrbotten County Jokkmokk ⓘ Ultevis	Roy (1972)
ⓘ Rakten	Collection of Naturhistoriska Riksmuseet i Stockholm (The Natural History Museum)
ⓘ Sörhårås	Ödman (1950)
ⓘ Stuor-Njåske	Wilke Band 4 Skandinavien
ⓘ Upper manganese ravine	Sandström (1997)
ⓘ Tjaktjajaure	Augsten (2010)
ⓘ Tjålme	Wilke Band 4 Skandinavien
Tjatisvare ⓘ Tjatjisvaratj beach	Nysten et al. (2021)
Örebro County Hällefors Grythyttan ⓘ Sjögruvan
Lindesberg Nyberget ⓘ Nyberget ore field	Roy (1972)
ⓘ Mangruvan
ⓘ Slöjdartorp	Koark (1970)
Skåne County Bromölla Näsum ⓘ Västanå Iron Mine (Westanå Mine)	Gatedal (n.d.)
Uppsala County Östhammar Dannemora ⓘ Dannemora Mine	Åberg (2015)
Värmland County Filipstad Långban Ore District ⓘ Långban Mine	Holtstam et al. (1999)
ⓘ Garden dump	Nysten (2003)
Nordmark mining district Jakobsberg ore field ⓘ Jakobsberg Mine	Holtstam et al. (1993)
Västernorrland County Kramfors ⓘ Berghamn	Sandström (1999)
ⓘ Norrklippen	Alan Goldstein photo & specimen (collected by Axel Österlöf)

Switzerland
Grisons Albula Region Surses Tinizong (Tinzen) ⓘ Alp digl Plaz deposit	Geiger T. (1948) +1 other reference
Err valley ⓘ Parsettens Alp	Stalder et al. (1998)
ⓘ Falotta	[var: Strontium-bearing Piemontite] Roth et al. (2013)
Maloja Region Bregaglia Upper Val Bregaglia Maroz Valley ⓘ Piz Cam	Wenk et al. (1978) +2 other references
Val Forno ⓘ Pizzi dei Rossi	Stalder et al. (1998)
Plessur Region Arosa Langwies ⓘ Litzirüti	Geiger T. (1948)
Viamala Region Rheinwald Splügen ⓘ Tanatz Alp	Roth et al. (2011)
Ticino Vallemaggia Cerentino ⓘ Maurino Quarry	Stalder et al. (1998)
Cevio ⓘ Pizzo Alzasca	...
Valais Entremont Val de Bagnes Mauvoisin ⓘ Lancey bridge	Stalder et al. (1998)
ⓘ Mont Durand	Ansermet et al. (2025)
Goms Binn Gischi glacier (incl. Gischihorn) ⓘ Gischi glacier REE-mineralization	Cuchet et al. (2023)
Visp Saas-Fee Fee Glacier ⓘ Felskinn	Stalder et al. (1998)
Täsch Täsch Valley ⓘ Sparrenflue	Stalder et al. (1998)

Tajikistan
Sughd Mastchoh District Altyn-Topkan ore field (Zarnisor ore field) ⓘ Altyn-Topkan deposit (Altyntopkan deposit; Altyn-Topkan Mine; Zarnisor deposit; Zarnisori Shimoli deposit; Northern Zarnisor deposit)	Xinjiang Tacheng International Resources Ltd.

Tanzania
Dodoma Region Kongwa District Kongwa ⓘ Mautia Hill	...

Turkey
Bursa Province Harmancık District ⓘ Bektaşlar	Okay (1997)
Kütahya Province Emet District Kayi Köy ⓘ Mn deposit	Müller (1954)
Niğde Province Ulukisla District ⓘ Horoz	Sunkari et al. (2025)

UK
Wales Gwynedd Aberdaron Rhiw ⓘ Benallt Mine	BMS Collection
Llanddeiniolen ⓘ Dinorwic Quarry ?

USA
Arizona Cochise County ⓘ Ash Canyon	Garske (n.d.)
Sulphur Springs Valley Pearce area ⓘ Pat Hills	Lausen (1927) +2 other references
Maricopa County Phoenix Phoenix Mountains ⓘ Piestewa Peak area	Anthony et al. (1995)
Pima County Comobabi Mountains Kovaya Hills ⓘ Kovaya Hills area	Bideaux et al. (1960) +1 other reference
ⓘ Northern Comobabi Mountains	Bideaux et al. (1960) +1 other reference
Old Baldy Mining District ⓘ Madera Canyon area	Guild (1935) +2 other references
Tucson Mountains Amole Mining District ⓘ Tucson Mountain Park	Guild (1935) +2 other references
ⓘ Juan Santa Cruz picnic grounds	Guild (1935) +1 other reference
Vail ⓘ Vail area	Anthony et al. (1995)
Pinal County Casa Grande Mining District Casa Grande ⓘ Casa Grande area	Anthony et al. (1995)
Yavapai County Bradshaw Mountains (Bradshaw Range) Prescott Mining District ⓘ Prescott - NW of	Krieger (1965) +1 other reference
ⓘ Prescott area	Boyd (2025)
Highway 89 ⓘ Piemontite occurrence
Williamson Valley Road ⓘ Piemontite occurrence	Boyd (2025)
California Kern County Lost Hills (Lost Hill) ⓘ Lazard area [1]	Reed (1927) +2 other references
ⓘ Lazard area [2]	Reed (1927) +1 other reference
Lassen County Haskell Peak ⓘ Unspecified Mn occurrence [2]	Murdoch (1966)
ⓘ Los Angeles County	AmMin 20:737
Big Pines Mine Gulch ⓘ Unnamed Mn occurrence	Sharp (1959) +3 other references
Mount Baldy District Big Pines San Gabriel River Prairie Fork ⓘ Unnamed ravine	Murdoch (1966) +2 other references
Newhall ⓘ Bouquet Canyon-Texas Canyon junction area	Simonson (1935) +1 other reference
Santa Catalina Island Escondido Canyon ⓘ North of Orizaba Peak (Mount Orizaba)	Bailey (1940) +3 other references
Madera County Agnew Meadows Olaine Lake ⓘ Agnew Meadow Mine (Agnew Meadow Manganese prospect/deposit; Mammoth Lakes)	Trask (1950) +2 other references
Ritter Range Garnet Lake ⓘ Unnamed Mn-Garnet occurrence (1)	Murdoch (1966) +2 other references
Minarets Mining District (Mountain Mining District; Raymond Mining District; Minaret Mining District) ⓘ Shadow Lake	Am Min 18:493
ⓘ Unnamed Mn-Asbestos-Zeolite occurrence (1)	Mayo (1932) +4 other references
ⓘ Unnamed Mn occurrence (2)	Mayo (1932) +2 other references
Mariposa County West Belt Granite Springs Mining District Granite Springs ⓘ Caldwell Mine (Daly Mine)	Taliaferro (1943a) +3 other references
Monterey County ⓘ Monterey Bay	Bradley (1933) +1 other reference
Orange County San Juan Capistrano ⓘ San Juan Capistrano Point area	its nature and origin: University of ... +2 other references
Plumas County Moccasin ⓘ Lakeview Valley VI Mine (Western Manganese Mine; Noble lease; EW; Braito Mine; Dixie Creek; Feather River; Iron Dyke Mine)	Taliaferro (1943) +4 other references
Riverside County Big Maria Mountains Black Hill ⓘ Lion's Den Copper claim (Little Mountain claims)	CDMG OFR 94-11 " Mineral Land ...
ⓘ Palen Mountains	Alfors (1964) +3 other references
Whitewater (White Water) Painted Hill ⓘ Unnamed Mn occurrence [3]	Bradley (1942) +3 other references
ⓘ Unnamed Piemontite occurrence [1] (San Gorgonio Pass)	Smith et al. (1967)
San Bernardino County Belleville Mining District Rodman Mountains Sidewinder Mountain ⓘ Unnamed Mn occurrence [4]	Bowen et al. (1954) +2 other references
Cajon Cajon Pass ⓘ Unnamed Mn occurrence [13]	Webb (1939) +2 other references
Lucerne Valley Limestone District Lucerne Valley ⓘ White Knob Quarry	Howard H. J. (2011)
Lytle Creek District Lytle Creek [town] Coldwater Canyon ⓘ Unnamed Mn occurrence [2]	Mayo (1933) +3 other references
Victorville East of Victorville ⓘ Unspecified Mn occurrence [3]	Bowen et al. (1954) +1 other reference
San Diego County ⓘ Pacific Beach	Rogers (1912) +1 other reference
Tulare County Lindsay ⓘ East of Lindsay [2 miles]	Alfors (1964) +1 other reference
ⓘ East of Lindsay [2½ miles]	Alfors (1964) +1 other reference
Colorado Boulder County Wallstreet ⓘ Unnamed pegmatite	Eckel et al. (1997)
Gunnison County Dorchester Mining District Taylor Park ⓘ Italian Mountain	Eckel et al. (1997)
White Earth Mining District (Powderhorn Mining District) ⓘ Iron Hill deposit	Larsen (1942)
Jefferson County Bergen Park area ⓘ Creswell Mine	Eckel et al. (1997)
Ouray County ⓘ Idarado Mine	Rocks & Min.:59:34 & 64:144.
Sneffels Mining District Imogene Basin ⓘ Camp Bird Mine	Rocks & Min.:62:9 +3 other references
Routt County Clark ⓘ Greenville Mine (Greenville Shaft prospect)	Eckel et al. (1997)
Connecticut Middlesex County Haddam ⓘ Hazen quarry (Epidote locality)	Davis (1901) +1 other reference
ⓘ District of Columbia (Washington D.C.)	Bernstein (1976)
Georgia ⓘ Gwinnett County	gamineral.org (2000)
Maryland ⓘ Washington County	Stuart Herring Collection
Massachusetts Middlesex County ⓘ Newton	Gleba (2008)
Norfolk County ⓘ Brookline	Gleba (2008)
Missouri Iron County Annapolis ⓘ Annapolis Roofing Granule Plant	Sherwood et al. (1998)
Nevada Humboldt County Osgood Mountains Potosi Mining District Adam Peak ⓘ Getchell Mine	Castor et al. (2004)
Lyon County Singatse Range Yerington Mining District Ludwig ⓘ Ludwig Gypsum Mine	Castor et al. (2004)
Mineral County Rawhide Mining District ⓘ Grutt Brothers mine	Castor et al. (2004)
Pershing County Black Diablo Mining District ⓘ Black Diablo Mine	- (2005)
Washoe County Hallelujah Junction area Petersen Mountain ⓘ Piemontite occurrence (1)	Castor et al. (2004)
Peavine Mining District Peavine Peak ⓘ Yuba Cañon	Mineralogical Society of America - ... +1 other reference
New Jersey Sussex County Ogdensburg Sterling Hill ⓘ Sterling Mine	Jenkins et al. (1) +1 other reference
New Mexico Grant County ⓘ Hanover-Fierro Mining District	Northrop et al. (1996)
Sierra County ⓘ Iron Mountain No. 2 District	Northrop et al. (1996)
Taos County ⓘ Glenwoody District	Northrop et al. (1996)
Pilar ⓘ Pilar Cliffs	New Mexico Bureau of Geology Mineral ...
Picuris District ⓘ ~~Harding Mine~~	Northrop et al. (1996)
ⓘ Pilar Wall Mine	New Mexico Bureau of Geology Mineral ...
ⓘ North Carolina
Chatham County Chestnut Hill Quarry ⓘ Silk Hope zone	Stoddard
Pennsylvania Adams County Hamiltonban Township ⓘ Glatfelter Farm	A.Mathauser collection
ⓘ Culp Ridge	Stuart Herring
ⓘ Russel and Bechtel Mines	Peter Cristofono collection
Iron Springs ⓘ Pine Mountain	Gordon (1922)
Menallen Township ⓘ Wenksville	The Geology and Mineral Resources of ...
Rhode Island Providence County ⓘ Cumberland	Miller (1971)
ⓘ San Juan Mountains	Eckel et al. (1997)
South Dakota Lawrence County Galena Mining District Roubaix ⓘ Obsidian	Roberts et al. (1965)
Texas Llano County ⓘ Horse Mountain	Smith (1991)
Virginia Halifax County ⓘ Hyco Formation	Dietrich (1990)
Washington King County Snoqualmie Mining District Hansen Creek area ⓘ Scout Patrol Peak	self collected

Mindat.org® is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Mindat® and mindat.org® are registered trademarks of the Hudson Institute of Mineralogy.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2026, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 by Jolyon Ralph and Ida Chau.
Content on this site may not be used to train, fine-tune, or otherwise develop artificial intelligence or machine learning models without prior written permission - see our Terms & Conditions.
To cite: Ralph, J., Von Bargen, D., Martynov, P., Zhang, J., Que, X., Prabhu, A., Morrison, S. M., Li, W., Chen, W., & Ma, X. (2025). Mindat.org: The open access mineralogy database to accelerate data-intensive geoscience research. American Mineralogist, 110(6), 833–844. doi:10.2138/am-2024-9486.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: October 29, 2026 14:36:33 Page updated: October 26, 2026 17:04:03

Go to top of page

Piemontite

About PiemontiteHide

Unique IdentifiersHide

Similar NamesHide

IMA Classification of PiemontiteHide

Classification of PiemontiteHide

Mineral SymbolsHide

Physical Properties of PiemontiteHide

Optical Data of PiemontiteHide

Chemistry of PiemontiteHide

Crystallography of PiemontiteHide

Crystal StructureHide

Geological EnvironmentHide

Type Occurrence of PiemontiteHide

Synonyms of PiemontiteHide

Other Language Names for PiemontiteHide

Varieties of PiemontiteHide

Relationship of Piemontite to other SpeciesHide

Common AssociatesHide

Related Minerals - Strunz-mindat GroupingHide

Other InformationHide

Internet Links for PiemontiteHide

References for PiemontiteHide

Localities for PiemontiteHide

Locality ListHide

Related Minerals - Strunz-mindat Grouping Hide