VS
Name
—
Fe²⁺₃(AsO₄)₂·8H₂O
Formula
—
Mineral Species
Entry type
—
Arsenates
Chemical class
—
Monoclinic
Crystal system
—
2–3
Mohs hardness
—
3.07–3.12
Specific gravity
—
Very pale blue or green
Streak
—
Vitreous to waxy
Luster
—
On {010}, perfect
Cleavage
—
C2/m
Space group
—
Vivianite
Structural group
—
Psym · Grandfathered
IMA
—
1954
Named in
—
Pale blue to greenish blue, green to leek-green; in transmitted light, pale blue to colorless
Typical colors
—
Fe · As · O · H
Elements
—