VS
Name
—
Mn²⁺ₓMn⁴⁺₁₋ₓO₂₋₂ₓ(OH)₂ₓ
Formula
—
Mineral Species
Entry type
—
Oxides & Hydroxides
Chemical class
—
—
Crystal system
—
6.5–8.5
Mohs hardness
—
4.24–4.67
Specific gravity
—
—
Streak
—
Metallic to earthy
Luster
—
—
Cleavage
—
—
Space group
—
Ramsdellite
Structural group
—
Nsu · Approved
IMA
—
1962
Named in
—
Dark gray to black; in reflected light, white with slightly creamy hue
Typical colors
—
Mn · O · H
Elements
—