VS
Name
—
(Mn⁴⁺,Mn²⁺,Fe³⁺)₆O₈(OH)₆
Formula
—
Mineral Species
Entry type
—
Oxides & Hydroxides
Chemical class
—
Orthorhombic
Crystal system
—
2–3
Mohs hardness
—
3.59
Specific gravity
—
Brownish black to dark brown
Streak
—
Dull
Luster
—
One direction, perfect
Cleavage
—
—
Space group
—
—
Structural group
—
Jgn · Approved
IMA
—
1975
Named in
—
Black; grayish white to gray in reflected light
Typical colors
—
Mn · Fe · O · H
Elements
—