VS
Name
—
Na₃K₂(Mn,Fe,Na)₄[Si₉(O,OH)₂₇](OH)₂·nH₂O
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Hexagonal
Crystal system
—
2–3
Mohs hardness
—
2.76–2.78
Specific gravity
—
—
Streak
—
Vitreous
Luster
—
Well developed on {00*1}
Cleavage
—
P31c
Space group
—
—
Structural group
—
Sfn · Approved
IMA
—
1981
Named in
—
Dark green to olive-green or yellow-green, after exposure to air, becomes yellow
Typical colors
—
Na · K · Mn · Fe · Si · O · H
Elements
—