VS
Name
—
Mn²⁺₈Si₆O₁₅(OH,Cl)₁₀
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Hexagonal
Crystal system
—
4–4.5
Mohs hardness
—
3.06–3.19
Specific gravity
—
—
Streak
—
Pearly on {0001}
Luster
—
Perfect on {0001}, {1010} less perfect
Cleavage
—
P-3m1
Space group
—
Pyrosmalite, Clay
Structural group
—
Pys-Mn · Approved
IMA
—
1953
Named in
—
Blackish green, pistachio-green, liver-brown, brown, gray
Typical colors
—
Mn · Si · O · H · Cl
Elements
—