VS
Name
—
Fe²⁺₂Al₉Si₄O₂₃(OH)
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Monoclinic
Crystal system
—
7–7.5
Mohs hardness
—
3.74–3.83
Specific gravity
—
White to grayish
Streak
—
Subvitreous to resinous
Luster
—
Distinct on {010}
Cleavage
—
C2/m
Space group
—
Staurolite
Structural group
—
St · Grandfathered
IMA
—
1792
Named in
—
Brown, Black, Red
Typical colors
—
Fe · Al · Si · O · H
Elements
—