Proustite

sulfosalt

silver

Formula: Ag3AsS3 sulfosalt
Specific gravity: 5.5 to 5.7
Hardness: 2½;
Streak: Scarlet red
Colour: Red
Solubility: Slightly soluble in nitric acid
Environments:

Hydrothermal environments

Proustite is a late forming mineral in the oxidation and enriched zone in epithermal (low temperature) hydrothermal veins, associated with other silver minerals and sulphides.

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