VS
Name
—
Ca₂CrCr₂[SiO₄][Si₂O₆(OH)](OH)₂O
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Monoclinic
Crystal system
—
6
Mohs hardness
—
3.432
Specific gravity
—
Gray-green
Streak
—
Vitreous
Luster
—
Distinct on {001}
Cleavage
—
C2/m
Space group
—
Pumpellyite
Structural group
—
Sui-Cr · Approved
IMA
—
2020
Named in
—
Greenish black, green to light green under daylight; purplish black
Typical colors
—
Ca · Cr · Si · O · H
Elements
—