VS
Name
—
(Na,Ca)Mn²⁺₁₂(Si,Al)₁₂(O,OH)₄₄
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Triclinic
Crystal system
—
5–6
Mohs hardness
—
3.3
Specific gravity
—
Light yellow, brown
Streak
—
Vitreous
Luster
—
Perfect to good on (010), fair on (100)
Cleavage
—
—
Space group
—
—
Structural group
—
Tny · Approved
IMA
—
1977
Named in
—
Greenish gray-yellow
Typical colors
—
Na · Ca · Mn · Si · Al · O · H
Elements
—