VS
Name
—
Cu₁₃Fe₂Ge₂S₁₆
Formula
—
Mineral Species
Entry type
—
Sulfides
Chemical class
—
Cubic
Crystal system
—
4
Mohs hardness
—
4.46–4.59
Specific gravity
—
Dark gray to black
Streak
—
Metallic, dull. R: (400) 21.9, (420) 21.5, (440) 21.1, (460) 20.6, (480) 20.0, (500) 19.6, (520) 19.7, (540) 20.2
Luster
—
—
Cleavage
—
P-43n
Space group
—
Sphalerite, Germanite
Structural group
—
Ger · Grandfathered
IMA
—
1922
Named in
—
Reddish gray, tarnishes to a dull brown; in polished section, pinkish gray
Typical colors
—
Cu · Fe · Ge · S
Elements
—