VS
Name
—
Cu₁.₄Pb₂.₄Bi₂.₄Sb₀.₂S₇
Formula
—
Mineral Species
Entry type
—
Sulfosalts
Chemical class
—
Orthorhombic
Crystal system
—
—
Mohs hardness
—
7.01
Specific gravity
—
Dark greenish gray to black
Streak
—
Bright metallic. Anisotropism: Very weak, from bluish gray to grayish red. R1 –R2: (400) 35.9–45.5, (420) 36.7–44.6
Luster
—
Indistinct ⊥ [001]; excellent k [001]
Cleavage
—
Pbmn
Space group
—
Kobellite
Structural group
—
Nuf · Approved
IMA
—
1967
Named in
—
Shiny lead-gray to steel-gray on fresh surface, tarnishes to pale iridescent grayish green to reddish brown
Typical colors
—
Cu · Pb · Bi · Sb · S
Elements
—