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Freibergite

Type Locality
Reiche Zeche Mine, Himmelfahrt Mine, Freiberg, Freiberg District, Erzgebirge, Saxony, Germany
Mineral Data
Ag6[Cu4Fe2]Sb4S13-x
Strunz: 
2.GB.05
Physical Properties
Colour: 
Grey
Hardness: 
3.5 - 4.0