Acanthite
Monoclinic crystal system, Silver sulfide, Argentite, Hydrothermal circulation, Supergene (geology), Pyrargyrite
978-613-9-77166-0
6139771668
92
2013-01-10
29,00 €
eng
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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Acanthite, Ag2S, crystallizes in the monoclinic system and is the stable form of silver sulfide below 173 °C. Argentite is the stable form above that temperature. As argentite cools below that temperature its cubic form is distorted to the monoclinic form of acanthite. Below 173 °C acanthite forms directly. Acanthite is the only stable form in normal air temperature. 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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