VS
Name
—
Cu₁₋ₓAsₓ (x ≈ 0.15)
Formula
—
Mineral Species
Entry type
—
Sulfides
Chemical class
—
Hexagonal
Crystal system
—
4
Mohs hardness
—
8.38
Specific gravity
—
—
Streak
—
Bright metallic. Anisotropism: Weak. R1 –R2: (400) 51.5–49.3, (420) 52.3–50.5, (440) 52.8–52.4, (460) 53.4–54.6
Luster
—
—
Cleavage
—
P6_3/mmc
Space group
—
—
Structural group
—
Ago · Grandfathered
IMA
—
1857
Named in
—
Steel-gray to silver-white, tarnishes dull on exposure; in polished section, bright cream-white
Typical colors
—
Cu · As
Elements
—