Tienshanite

Tienshanite

Tienshanite structure
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
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 - 6½
Luster vitreous
References [1][2]

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[O5.5(OH,F)3.5]F2.[4]

References

  1. 1 2 Mindat.org - Tienshanite
  2. 1 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


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