VS
Name
—
Co₃(AsO₄)₂·8H₂O
Formula
—
Mineral Species
Entry type
—
Arsenates
Chemical class
—
Monoclinic
Crystal system
—
1.5–2.5
Mohs hardness
—
3.06
Specific gravity
—
Pale red to pink
Streak
—
Subadamantine, pearly on cleavages
Luster
—
Perfect on {010}; poor on {100} and {102}
Cleavage
—
C2/m
Space group
—
Vivianite
Structural group
—
Ery · Grandfathered
IMA
—
1832
Named in
—
Red, Pink, Purple, Gray
Typical colors
—
Co · As · O · H
Elements
—