VS
Name
—
(Ca,K,Na)ₓMn₆(Si,Al)₁₀O₂₄(OH)₄·nH₂O (x = 1-2; n = 7-11)
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Orthorhombic
Crystal system
—
4
Mohs hardness
—
2.85
Specific gravity
—
White
Streak
—
Vitreous to pearly
Luster
—
Perfect on {001}
Cleavage
—
Pnma
Space group
—
—
Structural group
—
Tam · Approved
IMA
—
1999
Named in
—
Colorless to pale yellowish brown, colorless in thin section
Typical colors
—
Ca · K · Na · Mn · Si · Al · O · H
Elements
—