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.[2][3][4] 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.[5]
| 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 |
| IMA symbol | Tsh[1] |
| 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 | [2][3] |