VS
Name
—
MnO₂
Formula
—
Mineral Species
Entry type
—
Oxides & Hydroxides
Chemical class
—
Orthorhombic
Crystal system
—
3
Mohs hardness
—
4.65–4.83
Specific gravity
—
Black, may have brownish tint
Streak
—
Brilliant metallic
Luster
—
Prominent, on three pinacoids and a prism
Cleavage
—
Pnam
Space group
—
Ramsdellite
Structural group
—
Rmd · Grandfathered
IMA
—
1932
Named in
—
Steel-gray to iron-black; yellowish white in reflected light
Typical colors
—
Mn · O
Elements
—