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Formula: NiSb
Antimonide, nickeline group
Crystal System: Hexagonal
Specific gravity: 7.591 to 8.23 measured, 8.629 calculated
Hardness: 5½
Streak: Reddish brown
Colour: Copper-red with a violet tint
Common impurities: Fe,Co,As,S
Environments:
Breithauptite occurs in hydrothermal calcite veins associated
with cobalt-nickel-silver
ores, associated with
silver, nickeline,
maucherite, cobaltite,
ullmannite,
tetrahedrite,
pyrrhotite,
cubanite, chalcopyrite,
sphalerite, galena and
calcite
(Webmin, Dana, HOM, Mindat).
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