Acanthite
Acanthite is the stable form of Ag2S,
a silver sulphide, at temperatures below 177ºC. Many reports in
the literature of argentite are actually acanthite after argentite.
Acanthite crystals are somewhat rare in silver-lead deposits.
Links:
Census
- where acanthite has been recorded in Australia and New Zealand
Acanthite on
Mindat
Mindat
acanthite gallery - Australia
Acanthite
on Webmineral
Acanthite, Magnet Mine, Waratah, Tasmania, FOV 2mm (B.
Carney Collection)