  Proustite.
Description from the source:
Proustite (Ag3 AsS3 trig.) and Acanthite (Ag2 S mon.), Uchucchacua Mine, Lima, Peru. Extremely good ruby red crystals with massive Acanthite and Calcite. 6x4,5x2,7 cm; 87 g.
Source: Simone Citon
Contributor: John Gray
Acquired: 30 September, 2008
Text Updated: 1 October, 2008
Price: Trade
Size: 2.4"
Composition: Ag3AsS3
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