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Bornite

Type Locality
Jáchymov (St Joachimsthal), Jáchymov District (St Joachimsthal), Krušné Hory Mts (Erzgebirge), Karlovy Vary Region, Bohemia (Böhmen; Boehmen), Czech Republic
Mineral Data
Cu5FeS4
Strunz: 
2.BA.15
Physical Properties
Crystal System: 
Tetragonal
Hardness: 
3.0
Tenacity: 
brittle