VS
Name
—
Mn²⁺₁₆As³⁺₃Si₁₂O₃₆(OH)₁₇
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Hexagonal
Crystal system
—
5
Mohs hardness
—
3.34–3.37
Specific gravity
—
—
Streak
—
Waxy; pearly on the basal cleavage
Luster
—
{0001}, perfect
Cleavage
—
P6_3
Space group
—
Pyrosmalite, Clay
Structural group
—
Slr · Grandfathered
IMA
—
1925
Named in
—
Red-brown
Typical colors
—
Mn · As · Si · O · H
Elements
—