VS
Name
—
Ag₄SeS
Formula
—
Mineral Species
Entry type
—
Sulfides
Chemical class
—
Monoclinic
Crystal system
—
2.5
Mohs hardness
—
7.4–7.53
Specific gravity
—
—
Streak
—
Metallic. Anisotropism: Very weak or isotropic. R1 –R2: (400) 34.8–35.1, (420) 34.7–35.2, (440) 34.6–35.2
Luster
—
—
Cleavage
—
P2_12_12_1
Space group
—
Acanthite
Structural group
—
Agu · Grandfathered
IMA
—
1891
Named in
—
Bright lead-gray on fresh surfaces; dull iron-black on exposed surfaces
Typical colors
—
Ag · Se · S
Elements
—