Domeykite

arsenide

algodonite

Formula: Cu3As
Arsenide
Specific gravity: 7.2 to 7.9
Hardness: 3 to 3½
Streak: black-grey
Colour: Tin white - steel grey
Solubility: Soluble in nitric acid (Dana)
Environments:

Hydrothermal environments

Domeykite is of hydrothermal origin, associated with copper (typically arsenian), silver and algodonite (HOM, mindat).

Common impurities: Sb,S



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