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Millerite

Type Locality
Jáchymov (St Joachimsthal), Jáchymov District (St Joachimsthal), Krušné Hory Mts (Erzgebirge), Karlovy Vary Region, Bohemia (Böhmen; Boehmen), Czech Republic
Mineral Data
NiS
Strunz: 
2.CC.20
Physical Properties
Crystal System: 
Trigonal
Hardness: 
3.0 - 3.5
Tenacity: 
brittle