VS
Name
—
Mn²⁺₂Al₃(SiO₄)(Si₂O₇)(OH)₃
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Monoclinic
Crystal system
—
3
Mohs hardness
—
3.256
Specific gravity
—
—
Streak
—
—
Luster
—
On {001} and {101}
Cleavage
—
P2_1/m
Space group
—
Ardennite
Structural group
—
Ss · Grandfathered
IMA
—
1926
Named in
—
Copper-red
Typical colors
—
Mn · Al · Si · O · H
Elements
—