Formula: Ag2S sulphide
Specific gravity: 7.3
Colour: Lead grey
Solubility: Acanthite is slightly soluble in hydrochloric acid and sulphuric acid.
Acanthite is a primary silver mineral that occurs in
epithermal (low temperature) hydrothermal silver ore
veins. It may also be of secondary origin.
pressure, acanthite is stable below 173°C. Above 173°C the
structure changes to produce crystals of twinned acanthite, known as argentite. Argentite is unstable
and if the temperature drops below this level it will change back to acanthite.
Common impurities: Se
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