VS
Name
—
(Ni,Co,Cu)Se₂
Formula
—
Mineral Species
Entry type
—
Sulfides
Chemical class
—
Cubic
Crystal system
—
2.5–3
Mohs hardness
—
6.58–6.74
Specific gravity
—
Black
Streak
—
Metallic, tarnishes rapidly. R: (400) 40.2, (420) 40.1, (440) 40.1, (460) 40.2, (480) 40.4, (500) 40.7, (520) 41.1
Luster
—
Perfect on {001}; distinct on {011}
Cleavage
—
Pa3
Space group
—
Pyrite
Structural group
—
Pen · Grandfathered
IMA
—
1926
Named in
—
Lead-gray; in polished section, creamy grayish white
Typical colors
—
Ni · Co · Cu · Se
Elements
—