VS
Name
—
Na(Fe²⁺,Fe³⁺,Al,Mg)₁₂(Si₆O₁₇)₂(O,OH)₁₀
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Triclinic
Crystal system
—
—
Mohs hardness
—
3.378
Specific gravity
—
—
Streak
—
Greasy
Luster
—
Good on {010}, fair on {100}, poor on {210}
Cleavage
—
P-1
Space group
—
—
Structural group
—
Hw · Approved
IMA
—
1964
Named in
—
Dark green to black
Typical colors
—
Na · Fe · Al · Mg · Si · O · H
Elements
—