VS
Name
—
Mn²⁺Mn³⁺₂(PO₄)₂(OH)₂·4H₂O
Formula
—
Mineral Species
Entry type
—
Phosphates
Chemical class
—
Monoclinic
Crystal system
—
3.5
Mohs hardness
—
2.84–2.85
Specific gravity
—
—
Streak
—
Vitreous to slightly resinous, dull
Luster
—
Perfect on {001}; imperfect on {110}
Cleavage
—
P2_1
Space group
—
Arthurite
Structural group
—
Brm · Grandfathered
IMA
—
1936
Named in
—
Reddish brown, darkening on exposure; yellowish brown to brownish red, with red internal reflections
Typical colors
—
Mn · P · O · H
Elements
—