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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
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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