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Mineralpedia Details for Capgaronnite

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Capgaronnite

Capgaronnite

Named after the type locality at the Cap Garonne mine in Var, France. Additional localities for Capgaronneite include in the Broken Hill mine in New South Wales, Australia, at Chanarcillo near Copiapo in Atacama, Chile, at the Frischer Mut Mine in Rhineland-Palatinate in Germany, at Adolf mine in Borsod-Abauj-Zemplen Co. in Hungary, and at Cerro Minado in Andalusia, Spain. Capgaronneits forms likely as an oxidation product of mercury and silver rich tennantite that has been exposed to seawater.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/capgaronnite.pdf

Formula
AgHgClS 
Crystal System
Orthorhombic 
Cleavage
Perfect, None, None 
Luster
Subadamantine 
Color
brownish black, black 
Streak
brownish black 
Class
Orthorhombic - Disphenoidal 
Hardness
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Capgaronnite from Broken Hill, New South Wales, Australia

Capgaronnite
            from Broken Hill, New South Wales, Australia

White Kaolinite with good coverage of soft grey Capgarronite and yellow waxy Iodargyrite. Scratching a fresh surface of the Capgarronite reveals a dark red to sometimes greenish color.

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