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Tsepinite-Sr
A valid IMA mineral species
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About Tsepinite-Sr
Formula:
Sr(Ti,Nb)2(Si4O12)(OH,O)2 · 3H2O
Colour:
Clear to white
Lustre:
Vitreous
Hardness:
5
Specific Gravity:
2.67
Crystal System:
Monoclinic
Member of:
Name:
Named for its relationship to other tsepinite species, with Sr dominant over Na, Ca, and K. The root name is for Anatoliy Ivanovich Tsepin (b. 1946), physicist of the Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry of the Russian Academy of Sciences (IGEM), specialist in X-ray spectroscopy and the electron-microprobe analysis of minerals, who initiated in the 1970s an electron-microprobe investigation of Labuntsovite Group minerals.
Unique Identifiers
Mindat ID:
27458
Long-form identifier:
mindat:1:1:27458:6
IMA Classification of Tsepinite-Sr
Approved
IMA Formula:
(Sr,Ba,K)(Ti,Nb)2(Si4O12)(OH,O)2 · 3H2O
Approval year:
2004
First published:
2005
Classification of Tsepinite-Sr
9.CE.30b
9 : SILICATES (Germanates)
C : Cyclosilicates
E : [Si4O12]8- 4-membered single rings (vierer-Einfachringe), without insular complex anions
9 : SILICATES (Germanates)
C : Cyclosilicates
E : [Si4O12]8- 4-membered single rings (vierer-Einfachringe), without insular complex anions
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 |
|---|---|---|
| Tsp-Sr | 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 Tsepinite-Sr
Vitreous
Transparency:
Transparent, Translucent
Colour:
Clear to white
Streak:
White
Hardness:
5 on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Irregular/Uneven
Density:
2.67(2) g/cm3 (Measured) 2.63(1) g/cm3 (Calculated)
Optical Data of Tsepinite-Sr
Type:
Biaxial (+)
RI values:
nα = 1.649(2) nβ = 1.652 nγ = 1.770(4)
2V:
Measured: 20° (5), Calculated: 16°
Max. Birefringence:
δ = 0.121
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:
Weak r < v
Pleochroism:
Non-pleochroic
Eveslogchorr Mt, Murmansk Oblast, Russia