VS
Name
—
Cu₂S
Formula
—
Mineral Species
Entry type
—
Sulfides
Chemical class
—
Monoclinic
Crystal system
—
2.5–3
Mohs hardness
—
5.5–5.8
Specific gravity
—
Blackish lead-gray
Streak
—
Metallic. Anisotropism: Weak. R1 –R2: (400) 37.0–36.8, (420) 37.8–37.4, (440) 37.7–37.6, (460) 37.0–37.2
Luster
—
Indistinct on {110}
Cleavage
—
P2_1/c
Space group
—
—
Structural group
—
Cc · Grandfathered
IMA
—
0
Named in
—
Gray, Black
Typical colors
—
Cu · S
Elements
—