VS
Name
—
(Cu,Fe,Ag)₉Se₈
Formula
—
Mineral Species
Entry type
—
Sulfides
Chemical class
—
Cubic
Crystal system
—
—
Mohs hardness
—
5.39
Specific gravity
—
—
Streak
—
Metallic. R: (400) —, (420) 19.0, (440) 21.4, (460) 23.5, (480) 25.5, (500) 27.5, (520) 29.1, (540) 30.1, (560) 31.7
Luster
—
—
Cleavage
—
Fm3m
Space group
—
Pentlandite
Structural group
—
Gef · Approved
IMA
—
1980
Named in
—
Brown with a creamy tint in reflected light
Typical colors
—
Cu · Fe · Ag · Se
Elements
—