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Grundmannite

Type Locality
El Dragón Mine, Potosí Department, Bolivia
Mineral Data
CuBiSe2
Isostructural with: 
Emplectite
Physical Properties
Colour: 
Black
Crystal System: 
Orthorhombic
Streak: 
Black
Hardness: 
2 - 2½
Tenacity: 
Brittle
Synonyms
Synonyms: 
IMA2015-038