Heterogenite

heterogenite

erythrite

skutterudite

linnaeite

Images

Formula: Co3+O(OH)
Hydroxide
Specific gravity: 4.13 to 4.47
Hardness: 3 to 5
Streak: Black, brown
Colour: Black, reddish, blackish-brown
Common impurities: Ni
Environments

Hydrothermal environments

Heterogenite occurs as a weathering product of skutterudite, an alteration product of linnaeite, and is widespread in residual soils above ultramafic rocks (Webmin).

Localities

At the Shaba province, DR Congo, heterogenite occurs as an alteration product of linnaeite, associated with linnaeite, spherocobaltite, malachite and cuprite (HOM).

At the type locality, the Wolfgang Maaßen mines, Schneeberg, Erzgebirgskreis, Saxony, Germany, heterogenite occurs as an alteration product of skutterudite, with pharmacosiderite and calcite (Dana, HOM).

At the Bou Azzer mining district, Drâa-Tafilalet Region, Morocco, heterogenite occurs on surface exposures in strongly weathered areas of the mines, often with erythrite. Sometimes it occurs as black flecks on which crystals of roselite-β have grown (Minrec 38.5.378).

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