VS
Name
—
(NH₄)Al₂(Si₃Al)O₁₀(OH)₂
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Monoclinic
Crystal system
—
—
Mohs hardness
—
2.58–2.62
Specific gravity
—
—
Streak
—
Silky
Luster
—
Perfect on {001}
Cleavage
—
C2/c
Space group
—
Mica
Structural group
—
Tbl · Approved
IMA
—
1981
Named in
—
White to yellowish green; nearly colorless in thin section
Typical colors
—
N · H · Al · Si · O
Elements
—