VS
Name
—
CoNi₂S₄
Formula
—
Mineral Species
Entry type
—
Sulfides
Chemical class
—
Cubic
Crystal system
—
4.5–5.5
Mohs hardness
—
4.5–4.8
Specific gravity
—
—
Streak
—
Metallic, brilliant on fresh surface. R: (400) 42.8, (420) 43.2, (440) 43.7, (460) 44.3, (480) 44.8, (500) 45.4
Luster
—
Imperfect on {001}
Cleavage
—
Fd3m
Space group
—
Spinel
Structural group
—
Seg · Grandfathered
IMA
—
1850
Named in
—
Pale gray to steel-gray; tarnishes easily to copper-red or violet-gray
Typical colors
—
Co · Ni · S
Elements
—