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[O_5.5(OH,F)_3.5]F₂.^[4]

References

1. ↑ Mindat.org - Tienshanite
2. ↑ Webmineral.com - Tienshanite
3. ↑ Handbook of Mineralogy - Tienshanite
4. ↑ 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