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Kirchhoffite

Type Locality
Darai-Pioz Glacier (Dara-i-Pioz; Dara-Pioz), Alai Range (Alayskiy), Tien Shan Mtn, Region of Republican Subordination, Tajikistan
Mineral Data
Cs(BSi2O6)
Strunz: 
9.GB.05
Physical Properties
Colour: 
Colorless
Hardness: 
6.0 - 6.5
Tenacity: 
brittle