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Stannite

Type Locality
West Wheal Kitty (Wheal Rock), West Wheal Kitty group, St Agnes, St Agnes District, Cornwall, England, UK
Mineral Data
Cu2(Fe,Zn)SnS4
Strunz: 
2.CB.15a
Physical Properties
Crystal System: 
Tetragonal
Streak: 
Black
Hardness: 
4.0