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Tienshanite

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Tienshanite
General
CategoryCyclosilicate
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
IMA symbolTsh
Strunz classification9.CL.05
Crystal systemHexagonal
Crystal classDipyramidal (6/m)
H-M symbol: (6/m)
Space groupHexagonal
Space group: P6/m
Identification
Colorolive-green
Mohs scale hardness6 – 6+1⁄2
Lustervitreous
References

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(Mn,Fe,Zn,Ti)6(Ti,Nb)6Si36B12O114[O5.5(OH,F)3.5]F2.

References

  1. Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  2. ^ Mindat.org – Tienshanite
  3. ^ Webmineral.com – Tienshanite
  4. Handbook of Mineralogy – Tienshanite
  5. 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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