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Teruggite
A valid IMA mineral species
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About Teruggite
Mario E. Teruggi
Formula:
Ca4Mg[AsO4]2[B6O7(OH)6]2 · 12H2O
Colour:
Colourless to white
Lustre:
Vitreous
Hardness:
2½
Specific Gravity:
2.149 - 2.20
Crystal System:
Monoclinic
Name:
Named in honor of Mario Egidio Teruggi (18 February 1919, Dolores, Argentina - 22 August 2002, La Plata, Argentina), professor of Geology, Universidad Nacional La Plata, Argentina. He made significant contributions to the sedimentology and petrology of Argentina. Pronounced tay-roo-gite.
This page provides mineralogical data about Teruggite.
Unique Identifiers
Mindat ID:
3917
Long-form identifier:
mindat:1:1:3917:4
IMA Classification of Teruggite
Approved
IMA Formula:
Ca4Mg[As5+B6O11(OH)6]2·14H2O
Approval year:
1968
First published:
1968
Classification of Teruggite
6.FA.25
6 : BORATES
F : Hexaborates
A : Neso-hexaborates
6 : BORATES
F : Hexaborates
A : Neso-hexaborates
27.1.6.1
27 : COMPOUND BORATES
1 : Miscellaneous
27 : COMPOUND BORATES
1 : Miscellaneous
10.2.3
10 : Borates with other anions
2 : Borates with phosphate or arsenate
10 : Borates with other anions
2 : Borates with phosphate or arsenate
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Tgg | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Teruggite
Vitreous
Transparency:
Transparent
Colour:
Colourless to white
Hardness:
2½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Distinct/Good
On {001}, good; on {110}, fair.
On {001}, good; on {110}, fair.
Density:
2.149 - 2.20 g/cm3 (Measured) 2.192 g/cm3 (Calculated)
Optical Data of Teruggite
Type:
Biaxial (+)
RI values:
nα = 1.526(1) nβ = 1.528(1) nγ = 1.551(1)
2V:
Measured: 33° , Calculated: 34°
Max. Birefringence:
δ = 0.025
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:
None to Very Low
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:
relatively weak
Chemistry of Teruggite
Mindat Formula:
Ca4Mg[AsO4]2[B6O7(OH)6]2 · 12H2O
Element Weights:
Crystallography of Teruggite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/c
Setting:
P21/a
Cell Parameters:
a = 15.675(13) Å, b = 19.920(14) Å, c = 6.255(4) Å
β = 99.33(7)°
β = 99.33(7)°
Ratio:
a:b:c = 0.787 : 1 : 0.314
Unit Cell V:
1,927.26 ų (Calculated from Unit Cell)
Z:
2
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Show
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
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Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Display Options
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
View
CIF File Best | x | y | z | a | b | c
CIF File Best | x | y | z | a | b | c
Rotation
Stop | Start
Stop | Start
Labels
Console Off | On | Grey | Yellow
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 | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0000390 | Teruggite | Dal Negro A, Kumbasar I, Ungaretti L (1973) The crystal structure of teruggite American Mineralogist 58 1034-1043 |  | 1973 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 12.13 Å | (100b) |
| 2.785 Å | (30) |
| 9.98 Å | (22b) |
| 3.577 Å | (22b) |
| 4.65 Å | (21b) |
| 8.37 Å | (20b) |
| 4.571 Å | (17) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 25 : Evaporites (prebiotic) |
Type Occurrence of Teruggite
General Appearance of Type Material:
white cauliflower-shaped nodules
Place of Conservation of Type Material:
Harvard University, Cambridge, Massachusetts, 109056; National Museum of Natural History, Washington, D.C., USA, 145925.
Associated Minerals at Type Locality:
Synonyms of Teruggite
Other Language Names for Teruggite
Related Minerals - Strunz-mindat Grouping
| 6.FA.05 | Aksaite | Mg[B6O7(OH)6] · 2H2O |
| 6.FA.10 | Mcallisterite | Mg2[B6O7(OH)6]2 · 9H2O |
| 6.FA.15 | Admontite | MgB6O10 · 7H2O |
| 6.FA.20 | Rivadavite | Na6Mg[B6O7(OH)6]4 · 10H2O |
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 Teruggite
mindat.org URL:
https://www.mindat.org/min-3917.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Teruggite
Reference List:
Aristarain, L. F., Hurlbut, C. S. (1968) Teruggite, 4CaO·MgO·6B2O3·As2O5·18H2O, a new mineral from Jujuy, Argentina. American Mineralogist, 53 (11-12) 1815-1827
Localities for Teruggite
Showing 3 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.
Argentina (TL) | |
| Aristarain et al. (1968) +3 other references |
Chile | |
| MinMag 66:253 |
Turkey | |
| American Mineralogist +5 other references |
Quick NavTopAbout TeruggiteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography Crystal StructureX-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesStrunz-MindatOther InformationInternet Links References Localities Locality List
Loma Blanca borate deposit, Coranzuli, Susques Department, Jujuy Province, Argentina