VS
Name
—
Fe²⁺Fe³⁺₂(PO₄)₂(OH)₂·4H₂O
Formula
—
Mineral Species
Entry type
—
Phosphates
Chemical class
—
Monoclinic
Crystal system
—
3
Mohs hardness
—
2.87
Specific gravity
—
—
Streak
—
Vitreous to subadamantine
Luster
—
On {100}, fair
Cleavage
—
P2_1/c
Space group
—
Arthurite
Structural group
—
Whm · Approved
IMA
—
1974
Named in
—
Deep brown to pale tan, greenish brown
Typical colors
—
Fe · P · O · H
Elements
—