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Mimetite-M
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About Mimetite-M
Formula:
Pb5(AsO4)3Cl
Colour:
Pale greenish yellow, white.
Lustre:
Sub-Adamantine, Vitreous, Sub-Vitreous, Resinous, Waxy
Hardness:
4
Specific Gravity:
7.36
Crystal System:
Monoclinic
Name:
Originally named clinomimetite in 1991 by Yongshan Dai, John M. Hughes, and Paul Brian Moore for its monoCLINic structure and chemical identity with mimetite. Renamed by Pasero et al. (2010).
First Recorded Locality:
Dimorph of:
Unique Identifiers
Mindat ID:
1080
Long-form identifier:
mindat:1:1:1080:7
Similar Names
| Mimetite | A valid IMA mineral species - grandfathered | Pb5(AsO4)3Cl |
| Mimetite-2M |
IMA Classification of Mimetite-M
IMA status notes:
Redefined by the IMA
Approval history:
Redefined as a Polymorphic Variant of mimetite in 2010.
Classification of Mimetite-M
8.BN.05
8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
N : With only large cations, (OH, etc.):RO4 = 0.33:1
8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
N : With only large cations, (OH, etc.):RO4 = 0.33:1
Dana 7th ed.:
41.8.6.1
41.8.6.1
41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
8 : A5(XO4)3Zq
41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
8 : A5(XO4)3Zq
22.2.11
22 : Phosphates, Arsenates or Vanadates with other Anions
2 : Phosphates, arsenates or vanadates with chloride
22 : Phosphates, Arsenates or Vanadates with other Anions
2 : Phosphates, arsenates or vanadates with chloride
Physical Properties of Mimetite-M
Sub-Adamantine, Vitreous, Sub-Vitreous, Resinous, Waxy
Transparency:
Transparent, Translucent
Colour:
Pale greenish yellow, white.
Streak:
White
Hardness:
4 on Mohs scale
Tenacity:
Brittle
Density:
7.36 g/cm3 (Measured) 7.37 g/cm3 (Calculated)
Optical Data of Mimetite-M
Type:
Biaxial (-)
RI values:
nα = 2.129 nβ = 2.144 nγ = 2.144
2V:
Measured: 8°
Birefringence:
0.025
Max. Birefringence:
δ = 0.015
Based on recorded range of RI values above.
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.
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.
Surface Relief:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
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.
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.
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.
Dispersion:
extreme
Optical Extinction:
Y,Z ^ b ~ 30°
Pleochroism:
Non-pleochroic
Chemistry of Mimetite-M
Mindat Formula:
Pb5(AsO4)3Cl
Element Weights:
Elements listed:
Common Impurities:
Ca,Si,S,P
Crystallography of Mimetite-M
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/c
Setting:
P21/b
Cell Parameters:
a = 10.189 Å, b = 20.372 Å, c = 7.461 Å
β = 119.88°
β = 119.88°
Ratio:
a:b:c = 0.5 : 1 : 0.366
Unit Cell V:
1,342.82 ų (Calculated from Unit Cell)
Z:
2
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.342 Å | (50) |
| 3.048 Å | (100) |
| 3.008 Å | (70) |
| 2.947 Å | (70) |
| 2.106 Å | (60) |
| 1.961 Å | (50) |
| 1.903 Å | (50) |
Geological Environment
Geological Setting:
Polymetallic ore deposits
First Recorded Occurrence of Mimetite-M
General Appearance of First Recorded Material:
Hexagonal prismatic crystals
Geological Setting of First Recorded Material:
Polymetallic ore deposit.
Associated Minerals at First Recorded Locality:
Synonyms of Mimetite-M
Other Language Names for Mimetite-M
Related Minerals - Strunz-mindat Grouping
| 8.BN. | Fluoralforsite | Ba5(PO4)3F |
| 8.BN. | Aradite | BaCa6[(SiO4)(VO4)](VO4)2F |
| 8.BN. | Magganasite | CuFe3+3O(AsO4)3 |
| 8.BN. | Fluorpyromorphite | Pb5(PO4)3F |
| 8.BN. | Fluorsigaiite | Ca2Sr3(PO4)3F |
| 8.BN.05 | Pieczkaite | Mn5(PO4)3Cl |
| 8.BN.05 | Fluorapatite | Ca5(PO4)3F |
| 8.BN.05 | Fluorcaphite | SrCaCa3(PO4)3F |
| 8.BN.05 | Vanadinite | Pb5(VO4)3Cl |
| 8.BN.05 | Hedyphane | Ca2Pb3(AsO4)3Cl |
| 8.BN.05 | Hydroxylhedyphane | Ca2Pb3(AsO4)3(OH) |
| 8.BN.05 | Johnbaumite | Ca5(AsO4)3(OH) |
| 8.BN.05 | Pliniusite | Ca5(VO4)3F |
| 8.BN.05 | 'Hydroxylapatite-M' | Ca5(PO4)3OH |
| 8.BN.05 | Hydroxylpyromorphite | Pb5(PO4)3(OH) |
| 8.BN.05 | Miyahisaite | (Sr,Ca)2Ba3(PO4)3F |
| 8.BN.05 | Carlgieseckeite-(Nd) | NaNdCa3(PO4)3F |
| 8.BN.05 | Belovite-(Ce) | NaCeSr3(PO4)3F |
| 8.BN.05 | Kuannersuite-(Ce) | NaCeBa3(PO4)3F0.5Cl0.5 |
| 8.BN.05 | Alforsite | Ba5(PO4)3Cl |
| 8.BN.05 | 'Unnamed (OH-analogue of Mimetite)' | Pb5(AsO4)3(OH) |
| 8.BN.05 | Stronadelphite | Sr5(PO4)3F |
| 8.BN.05 | Parafiniukite | Ca2Mn3(PO4)3Cl |
| 8.BN.05 | Mimetite | Pb5(AsO4)3Cl |
| 8.BN.05 va | 'Germanate-pyromorphite' | Pb5(PO4)2GeO4 |
| 8.BN.05 | Belovite-(La) | NaLaSr3(PO4)3F |
| 8.BN.05 | Fluorphosphohedyphane | Ca2Pb3(PO4)3F |
| 8.BN.05 | Fluorstrophite | SrCaSr3(PO4)3F |
| 8.BN.05 | Hydroxylapatite | Ca5(PO4)3(OH) |
| 8.BN.05 | 'Johnbaumite-M' | Ca5(AsO4)3OH |
| 8.BN.05 | Phosphohedyphane | Ca2Pb3(PO4)3Cl |
| 8.BN.05 | Turneaureite | Ca5(AsO4)3Cl |
| 8.BN.05 | Morelandite | Ca2Ba3(AsO4)3Cl |
| 8.BN.05 | 'Oxypyromorphite' | Pb10(PO4)6O |
| 8.BN.05 | Deloneite | (Na0.5REE0.25Ca0.25)(Ca0.75REE0.25)Sr1.5(CaNa0.25REE0.25)(PO4)3F0.5(OH)0.5 |
| 8.BN.05 | Chlorapatite | Ca5(PO4)3Cl |
| 8.BN.05 | Pyromorphite | Pb5(PO4)3Cl |
| 8.BN.05 | Vanackerite | Pb4Cd(AsO4)3Cl |
| 8.BN.05 | Svabite | Ca5(AsO4)3F |
| 8.BN.10 | Arctite | Na2Ca4(PO4)3F |
| 8.BN.10 | Krügerite | BaCa6(SiO4)2[(P0.5S0.5)O4]2F |
| 8.BN.15 | Goryainovite | Ca2(PO4)Cl |
Other Information
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 Mimetite-M
mindat.org URL:
https://www.mindat.org/min-1080.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Mimetite-M
Localities for Mimetite-M
Showing 14 localities.
symbol to view information about a locality.
The Locality List
- 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).
All localities listed without proper references should be considered as questionable.
France | |
| Le cahier des Micromonteurs |
Germany | |
| Dai (1993) |
| Dai (1993) +1 other reference |
Greece | |
| |
| |
| |
| Rieck et al. (1999) | |
| |
| Wendel et al. (1999) |
Poland | |
| Macioch et al. (2018) |
USA | |
| various added photos |
| Rick Dalrymple Collection | |
| Bullock (1981) +1 other reference | |
| Collection of Rick Dalrymple |
Quick NavTopAbout Mimetite-MUnique IdentifiersSimilar NamesIMA Classification Classification Physical Properties Optical Data Chemistry Crystallography X-Ray Powder DiffractionGeological EnvironmentFirst Recorded Occurrence SynonymsOther LanguagesStrunz-MindatOther InformationInternet Links References Localities Locality List
Eureka Hill Mine, Eureka, Juab County, Utah, USA