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Mineralpedia Details for Cobaltaustinite

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Cobaltaustinite

Cobaltaustinite

Named as the cobalt analogue to the mineral austinite. Cobaltaustinite is a rare mineral that occurs as a secondary mineral in oxidized copper deposits as an alteration product of arsenides in localities in Australia including at its type locality at Dome Rock in South Australia, in Germany, at Laurion in Greece, and in Morocco at Bou Azzer. Minerals associated with cobaltaustinite include erythrite, roselite-beta, arthurite, conichalcite, chenevixite, scorodite, and heterogenite.

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

Formula
CaCoAsO4(OH) 
Crystal System
Orthorhombic 
Cleavage
None, None, None 
Luster
Earthy (Dull) 
Color
green 
Streak
light green 
Class
Orthorhombic - Disphenoidal 
Hardness
4.5 
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Cobaltaustinite from Dome Rock mine, Olary, South Australia, Australia

Cobaltaustinite
            from Dome Rock mine, Olary, South Australia, Australia

Dome Rock is now a nature preserve and collecting at this locality is illegal. This specimen shows excellent crystal aggregates to 1mm. Cobaltaustinite forms a solid solution with Conichalcite by ionic substitution and is the cobalt analogue. It is shown here with Erythrite. Heterogenite occurs as a jet black coating.

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Cobaltaustinite from Bou Azzer dist., Anti-Atlas, Morocco

Cobaltaustinite
            from Bou Azzer dist., Anti-Atlas, Morocco

Green spherical crystals of rare Cobaltaustinite to 1mm on Dolomite with 3mm crystals of cobaltoan Talmessite.

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