VS
Name
—
(Ni,Co,Fe)As₃
Formula
—
Mineral Species
Entry type
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Sulfosalts
Chemical class
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Cubic
Crystal system
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5.5–6
Mohs hardness
—
6.5
Specific gravity
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Black
Streak
—
Bright metallic on fresh surfaces. Anisotropism: Weak to distinct in some zones. R: (400) 52.0, (420) 52.5, (440) 53.3
Luster
—
Distinct on {001} and {111}, in traces on {011}
Cleavage
—
—
Space group
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Perovskite, Skutterudite
Structural group
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Nskt · Approved
IMA
—
1893
Named in
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Tin-white to silver-gray, may tarnish gray or iridescent; in reflected light, yellowish white
Typical colors
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Ni · Co · Fe · As
Elements
—