VS
Name
—
(Cu,Ag)₂Pb₂₁Sb₂₃S₅₅ClO
Formula
—
Mineral Species
Entry type
—
Halides
Chemical class
—
Monoclinic
Crystal system
—
—
Mohs hardness
—
5.97
Specific gravity
—
Brown
Streak
—
Metallic. Bireflectance: Weak, white to white-gray. Anisotropism: Distinct
Luster
—
Good on {201 }
Cleavage
—
C2/m
Space group
—
—
Structural group
—
Plx · Approved
IMA
—
2001
Named in
—
Black; in reflected light, red internal reflections at grain edges and defects
Typical colors
—
Cu · Ag · Pb · Sb · S · Cl · O
Elements
—