VS
Name
—
Mn²⁺₅Al(Si₃Al)O₁₀(OH)₈
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Orthorhombic
Crystal system
—
2–2.5
Mohs hardness
—
2.89–3.07
Specific gravity
—
—
Streak
—
Pearly on cleavage faces
Luster
—
{001}, perfect
Cleavage
—
—
Space group
—
Chlorite, Clay
Structural group
—
Pnn · Grandfathered
IMA
—
1946
Named in
—
Orange-brown, reddish brown, brown, dark red, dark green, black; in transmitted light, orange, pinkish
Typical colors
—
Mn · Al · Si · O · H
Elements
—