VS
Name
—
(Ca,Mn²⁺)₀.₂(Mn⁴⁺,Mn³⁺)O₂·0.6H₂O
Formula
—
Mineral Species
Entry type
—
Oxides & Hydroxides
Chemical class
—
Hexagonal
Crystal system
—
—
Mohs hardness
—
3.336
Specific gravity
—
Pale reddish brown with a lilac to purple hue
Streak
—
Bright metallic
Luster
—
—
Cleavage
—
P-3
Space group
—
—
Structural group
—
Rnc · Grandfathered
IMA
—
1859
Named in
—
Black, brown, violet; brown in transmitted light
Typical colors
—
Ca · Mn · O · H
Elements
—