Tienshanite

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] 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^[3].

References

^ http://www.mindat.org/min-3958.html

^ http://webmineral.com/data/Tienshanite.shtml

^ 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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