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Berzelianite

Type Locality
Skrikerum Mine (Skrickerum Mine), Valdemarsvik, Östergötland, Sweden
Mineral Data
Cu2Se
Strunz: 
2.BA.20
Physical Properties
Crystal System: 
Isometric
Streak: 
Shining
Hardness: 
2.0
Tenacity: 
malleable