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Crookesite

Type Locality
Skrikerum Mine (Skrickerum Mine), Valdemarsvik, Östergötland, Sweden
Mineral Data
Cu7(Tl, Ag)Se4
Strunz: 
2.BD.50
Physical Properties
Colour: 
Lead Grey
Crystal System: 
Tetragonal
Hardness: 
2.5 - 3.0
Tenacity: 
brittle