Chlorargyrite

Formula: AgCl chloride
Specific gravity: 5.5 to 5.6
Hardness: 1½
Streak: White to grey
Colour: Colourless, white, yellowish, brownish, grey, black
Melts at 455°
Environments:

Hydrothermal environments

Chlorargyrite is a secondary mineral found in the oxidation zone of silver deposits, especially in arid regions, and in epithermal (low temperature) veins. It is found associated with native silver, cerussite and other secondary minerals.

At Broken Hill, New South Wales, Australia, chlorargyrite occurs in vuggy coronodite Pb(Mn4+6Mn3+2)O16 with goethite, sometimes associated with smithsonite. It is also found with cerussite, dolomite and malachite. At deeper levels it is a late-stage mineral in the arsenate zones, associated with carminite PbFe3+2(AsO4)2(OH)2 and members of the segnitite to beudantite series.

Chlorargyrite and bromargyrite AgBr occur sparingly at the San Rafael Mine, Nevada, USA, associated with mimetite, anglesite and bayldonite.

Common impurities: I