VS
Name
—
Bi₄S₃
Formula
—
Mineral Species
Entry type
—
Sulfides
Chemical class
—
Hexagonal
Crystal system
—
2
Mohs hardness
—
7.8
Specific gravity
—
Dark gray
Streak
—
Metallic. Anisotropism: Nearly isotropic in basal section, moderately anisotropic, pale gray to gray
Luster
—
{0001}, perfect
Cleavage
—
R-3m
Space group
—
Tetradymite
Structural group
—
Ik · Approved
IMA
—
1959
Named in
—
Lead-gray; in polished section, white with faintly creamy tint
Typical colors
—
Bi · S
Elements
—