VS
Name
—
(Al,Li)(Mn⁴⁺,Mn³⁺)O₂(OH)₂
Formula
—
Mineral Species
Entry type
—
Oxides & Hydroxides
Chemical class
—
Hexagonal
Crystal system
—
2.5–3
Mohs hardness
—
3.14–3.37
Specific gravity
—
Blackish gray to greenish black
Streak
—
Dull to metallic
Luster
—
{0001}, micaceous
Cleavage
—
R-3m
Space group
—
—
Structural group
—
Lpr · Grandfathered
IMA
—
1870
Named in
—
Bluish black; light gray to dark brownish gray in reflected light
Typical colors
—
Al · Li · Mn · O · H
Elements
—