Category Cyclosilicate Crystal system Hexagonal | Strunz classification 9.CL.05 | |
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Formula(repeating unit) KNa3(Na,K,[])6(Ca,Y,RE)2Ba6(Mn,Fe,Zn,Ti)6(Ti,Nb)6Si36B12O114[O5.5(OH,F)3.5]F2 Crystal class Dipyramidal (6/m)H-M symbol: (6/m) Space group HexagonalSpace group: P6/m | ||
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. 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.
References
Tienshanite Wikipedia(Text) CC BY-SA