VS
Name
—
Bi₂Se₂Te
Formula
—
Mineral Species
Entry type
—
Sulfides
Chemical class
—
Hexagonal
Crystal system
—
—
Mohs hardness
—
7.94
Specific gravity
—
Black
Streak
—
Metallic. Anisotropism: Moderate, blue to bluish gray. R1 –R2: (400) —, (420) 41.0–43.0, (440) 44.6–46.1
Luster
—
Perfect on {0001}
Cleavage
—
R-3m
Space group
—
Tetradymite
Structural group
—
Skp · Approved
IMA
—
1986
Named in
—
Steel-gray; white with a yellow tint in polished section
Typical colors
—
Bi · Se · Te
Elements
—