Argentite

minerals

acanthite

Formula: Ag2S
Sulphide, isometric paramorph of acanthite, which is monoclinic.
Argentite is not recognised by the IMA as a distinct mineral species. It is the high-temperature form of silver sulphide, only stable over 177oC. Below this temperature, argentite converts to acanthite.

At the Mount Lyell Mines, Queenstown district, West Coast municipality, Tasmania, Australia, acanthite pseudomorphs after argentite have been found in a vein of chalcocite, bornite and tetrahedrite between massive pyrite and hematite bodies (AJM 21.2.21).

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