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Formula: AuAgS
Sulphide of gold and silver
Specific gravity: 9.5 calculated
Hardness: 2 to 2½
Streak: Dark grey, sometimes with reddish brown tint
Colour: Dark grey to nearly black
Solubility: Does not react with FeCl3, KOH, or hydrochloric acid. A brown film is formed with 1:1
nitric acid (AM 70.1331)
Common impurities: Minor Se may replace S
Environments
Petrovskaite occurs in
sulphide/arsenide/selenide veins
(Mindat).
Localities
At the type locality, the Maikain Au deposit, Bayanaul, Pavlodar Region, Kazakhstan, petrovskaite occurs in
lower part (depth 60-65 m) of the gold deposit as fine-grained rims (10-20 mm) on
native gold, and also associated with
chlorargyrite
(AM 70.1331).
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