Acanthite (Silver Sulfide) Ag2S
Imiter Mine, Morocco
Acanthite crystallizes in the monoclinic system and is the stable form of silver sulfide below 173 °C. It is the only stable form in normal air temperature. It is about 65% pure silver.
Acanthite is a common silver mineral in moderately low-temperature hydrothermal veins and in zones of supergene enrichment. It occurs in association with native silver, pyrargyrite, proustite, polybasite, stephanite, aguilarite, galena, chalcopyrite, sphalerite, calcite and quartz.
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