VS
Name
—
Fe²⁺Al₂O(SiO₄)(OH)₂
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Triclinic
Crystal system
—
6.5
Mohs hardness
—
3.46–3.8
Specific gravity
—
White, grayish, or very slightly greenish
Streak
—
Somewhat pearly on cleavage surfaces
Luster
—
Perfect on {001}, distinct on {110}; parting on {010}
Cleavage
—
C-1
Space group
—
Chloritoid
Structural group
—
Cld · Grandfathered
IMA
—
1832
Named in
—
Green, Gray, Black
Typical colors
—
Fe · Al · O · Si · H
Elements
—