Tienshanite
Tienshanite, named for the Tian Shan Range in Mongolia, is a rare borosilicate mineral, though rock-forming in some parts of its original locality at the Dara-i-Pioz Glacier in Tajikistan.[1][2][3] Its formula is extremely complex: KNa3(Na,K,[])6(Ca,Y,RE)2Ba6(Mn2+,Fe2+,Zn,Ti)6(Ti,Nb)6Si36B12O114[O5.5(OH,F)3.5]F2.[4]
| Tienshanite | |
|---|---|
 | |
| General | |
| Category | Cyclosilicate |
| Formula (repeating unit) | KNa3(Na,K,[])6(Ca,Y,RE)2Ba6(Mn2+,Fe2+,Zn,Ti)6 (Ti,Nb)6Si36B12O114[O5.5(OH,F)3.5]F2 |
| Strunz classification | 9.CL.05 |
| Crystal system | Hexagonal |
| Crystal class | Dipyramidal (6/m) H-M symbol: (6/m) |
| Space group | Hexagonal Space group: P6/m |
| Identification | |
| Color | olive-green |
| Mohs scale hardness | 6 - 6 1⁄2 |
| Luster | vitreous |
| References | [1][2] |
References
- Mindat.org - Tienshanite
- Webmineral.com - Tienshanite
- Handbook of Mineralogy - Tienshanite
- Cooper M. A., Hawthorne F. C. and Grew E. S. 1998: Refinement of the crystal structure of tienshanite: short-range-order constrains on chemical composition. The Canadian Mineralogist, 36, pp. 1305-1310
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