Willemseite

willemseite

trevorite

nimite

violarite

Images

Formula: Ni3Si4O10(OH)2
Phyllosilicate (sheet silicate), pyrophyllite-talc group, nickel-bearing mineral
Specific gravity: 3.31
Hardness: 2
Streak: Greenish white
Colour: Light green
Common impurities: Al,Fe,Co,Ca,H2O
Environments

Hydrothermal environments

Localities

At the type locality, the Bon Accord Ni deposit, Barberton, Ehlanzeni District, Mpumalanga, South Africa, willemseite occurs as a secondary mineral in a nickel-bearing layered igneous sill. Associated minerals include ferroan trevorite, nimite, violarite, millerite, reevesite, goethite and opal (AM 55.31-42, HOM).

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