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Polybasite

Mineral Data
[(Ag,Cu)6(Sb,As)2S7][Ag9CuS4]
Strunz: 
2.GB.15
Physical Properties
Crystal System: 
Monoclinic - Prismatic
Streak: 
black
Hardness: 
2.5 - 3.0
Tenacity: 
very brittle
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