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Formula: (Ni,Mg,Al)6(Si,Al)4O10(OH)8
Phyllosilicate (sheet silicate), chlorite group,
nickel-bearing mineral
Crystal System: Monoclinic
Specific gravity: 3.123 measured, 3.21 calculated
Hardness: 3
Streak: White
Colour: Yellowish green
Common impurities: Cr,Mn,Co,Ca,H2O
Environments
Localities
At the type locality, the Bon Accord Ni deposit, Barberton, Mbombela Local Municipality, Ehlanzeni District
Municipality, Mpumalanga, South Africa, nimite occurs in a small tabular body of
nickeliferous
serpentinite at the contact between
quartzite and
ultramafic rocks. Associated minerals include
ferroan trevorite, violarite,
millerite, willemseite and
secondary reevesite
and goethite. The nimite appears to have formed at about
730oC and less than 2 kbar pressure during thermal metamorphism, possibly of a
nickel-rich meteorite.
(AM 54.1739, HOM).
At the Clear Creek claim (Clear Creek Mine), Goat Mountain, San Benito county, California, USA, nimite has
been identified in the silicate-carbonate rocks
(MinRec 36.4.354).
At Hunting Hill Quarry, Rockville, Montgomery county, Maryland, USA, nimite has been confirmed. The single
known specimen shows greenish blue fine-grained plates associated with
titanite, clinozoisite and
black calcite
(MinRec 36.5.443).
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