Tyretskite
A valid IMA mineral species
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About Tyretskite
Formula:
Ca2B5O9OH · H2O
Colour:
White, light brown
Lustre:
Vitreous
Hardness:
5
Specific Gravity:
2.189
Crystal System:
Triclinic
Member of:
Name:
Named after its discovery locality, Tyret' station, Irkutian region, Russia.
Unique Identifiers
Mindat ID:
4069
Long-form identifier:
mindat:1:1:4069:9
IMA Classification of Tyretskite
Approved
IMA Formula:
Ca2B5O9(OH) · H2O
Classification of Tyretskite
6.ED.05
6 : BORATES
E : Pentaborates
D : Tekto-pentaborates
6 : BORATES
E : Pentaborates
D : Tekto-pentaborates
26.5.15.1
26 : HYDRATED BORATES CONTAINING HYDROXYL OR HALOGEN
5 : Pentaborates
26 : HYDRATED BORATES CONTAINING HYDROXYL OR HALOGEN
5 : Pentaborates
9.3.9
9 : Borates
3 : Borates of Ca and Sr
9 : Borates
3 : Borates of Ca and Sr
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 |
|---|---|---|
| Tyr | 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 Tyretskite
Vitreous
Transparency:
Translucent
Colour:
White, light brown
Streak:
White
Hardness:
5 on Mohs scale
Density:
2.189 g/cm3 (Measured) 2.57 g/cm3 (Calculated)
Optical Data of Tyretskite
Type:
Biaxial (+)
RI values:
nα = 1.637 nβ = 1.65 nγ = 1.670
2V:
Measured: 46° , Calculated: 80°
Max. Birefringence:
δ = 0.033
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.
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.
Surface Relief:
Moderate
Dispersion:
r > v or r < v
Chemistry of Tyretskite
Mindat Formula:
Ca2B5O9OH · H2O
Element Weights:
Elements listed:
Crystallography of Tyretskite
Polytype:
Formula:
Crystal System:
Class (H-M)
Space Group:
Space Group Setting:
Cell Parameters:
Ratio:
Unit Cell Volume (calc):
Z:
Comment:
| Tyretskite-1A |
|---|
| Ca2B5O9OH · H2O |
| Triclinic |
| 1 - Pedial |
| P1 |
| a = 6.44 Å, b = 6.45 Å, c = 6.41 Å α = 61.76°, β = 60.25°, γ = 73.50° |
| a:b:c = 0.998 : 1 : 0.994 |
| V 203.23 ų (Calculated from Unit Cell) |
| 1 |
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.93 Å | (10) |
| 2.86 Å | (10) |
| 2.14 Å | (9) |
| 1.846 Å | (9) |
| 2.06 Å | (8) |
| 2.80 Å | (7) |
| 3.23 Å | (6) |
| 1.985 Å | (6) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 25 : Evaporites (prebiotic) |
Type Occurrence of Tyretskite
Place of Conservation of Type Material:
A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia, 76340.
Associated Minerals at Type Locality:
Other Language Names for Tyretskite
Dutch:Tyretskiet
German:Tyretskit
Simplified Chinese:三斜氯羟硼钙石
Spanish:Tyretskita
Traditional Chinese:三斜氯羥硼鈣石
Relationship of Tyretskite to other Species
Member of:
Other Members of Hilgardite Group:
| Hilgardite | Ca2B5O9Cl · H2O | Tric. 1 : P1 |
| Kurgantaite | CaSr[B5O9]Cl · H2O | Tric. 1 : P1 |
| Leucostaurite | Pb2[B5O9]Cl · 0.5H2O | Orth. mm2 : Pnn2 |
Related Minerals - Strunz-mindat Grouping
| 6.ED.05 | Kurgantaite | CaSr[B5O9]Cl · H2O |
| 6.ED.05 | Hilgardite | Ca2B5O9Cl · H2O |
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 Tyretskite
mindat.org URL:
https://www.mindat.org/min-4069.html
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Please feel free to link to this page.
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External Links:
Mineral Dealers:
References for Tyretskite
Localities for Tyretskite
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.
Kazakhstan | |
| - (1993) +1 other reference |
Russia | |
| Museum Victoria Registration Number: M ... |
| Pekov (1998) |
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Tyret' railway station, Lena-Angara salt Basin, Irkutsk Oblast, Russia