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Pearceite

Type Locality
Mollie Gibson Mine (Molly Gibson Mine), Aspen, Aspen District (Roaring Fork District), Pitkin Co., Colorado, USA
Mineral Data
[(Ag,Cu)6(As,Sb)2S7][Ag9CuS4]
Strunz: 
2.GB.15
Physical Properties
Streak: 
black
Hardness: 
2.5 - 3.0