VS
Name
—
Fe₂Si₂O₅(OH)₄·2H₂O
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
—
Crystal system
—
2.5–3
Mohs hardness
—
2.43–2.67
Specific gravity
—
Yellowish brown
Streak
—
Resinous, vitreous, greasy
Luster
—
—
Cleavage
—
—
Space group
—
Clay, Kaolinite
Structural group
—
Hsg · Grandfathered
IMA
—
1819
Named in
—
Black, dark brown; dark green masses may turn brown in light; in thin section, greenish brown or golden yellow
Typical colors
—
Fe · Si · O · H
Elements
—