VS
Name
—
Mn²⁺₁₆As³⁺₃Si₁₂O₃₆(OH)₁₇
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Monoclinic
Crystal system
—
5
Mohs hardness
—
3.46
Specific gravity
—
Light brown
Streak
—
Vitreous on cleavages, resinous and duller on fractures
Luster
—
{0001}, perfect
Cleavage
—
R-3m
Space group
—
Pyrosmalite, Clay
Structural group
—
Nln · Approved
IMA
—
1982
Named in
—
Light to medium brown; in transmitted light, colorless to light brown
Typical colors
—
Mn · As · Si · O · H
Elements
—