VS
Name
—
Na₆Fe²⁺Al₄Si₈O₂₆
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Monoclinic
Crystal system
—
2–3
Mohs hardness
—
2.62
Specific gravity
—
—
Streak
—
Pearly on {001}
Luster
—
Perfect micaceous on {001}; {401} and {010}, distinct
Cleavage
—
C2/m
Space group
—
—
Structural group
—
Nj · Grandfathered
IMA
—
1933
Named in
—
Gray to silver-white; colorless in thin section
Typical colors
—
Na · Fe · Al · Si · O
Elements
—