VS
Name
—
Ag₂Se
Formula
—
Mineral Species
Entry type
—
Sulfides
Chemical class
—
Orthorhombic
Crystal system
—
2.5
Mohs hardness
—
7–8
Specific gravity
—
Black
Streak
—
Metallic. Anisotropism: Distinct but weak, pale gray to dark gray. R1 –R2: (400) 37.2–41.8, (420) 37.0–41.2
Luster
—
—
Cleavage
—
P2_12_12_1
Space group
—
—
Structural group
—
Nau · Grandfathered
IMA
—
1828
Named in
—
Grayish iron-black, tarnishes to iridescent brownish
Typical colors
—
Ag · Se
Elements
—