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.^[2][3][4] 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.^[5]

Tienshanite
General
Category	Cyclosilicate
Formula	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]