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Argentopyrite

Type Locality
Jáchymov (St Joachimsthal), Jáchymov District (St Joachimsthal), Krušné Hory Mts (Erzgebirge), Karlovy Vary Region, Bohemia (Böhmen; Boehmen), Czech Republic
Mineral Data
AgFe2S3
Strunz: 
2.CB.65
Physical Properties
Crystal System: 
Orthorhombic
Streak: 
Grey.
Hardness: 
3.5 - 4.0
Tenacity: 
brittle
Photos