VS
Name
—
Fe²⁺Al₂(SO₄)₄·22H₂O
Formula
—
Mineral Species
Entry type
—
Sulfates
Chemical class
—
Monoclinic
Crystal system
—
1.5
Mohs hardness
—
1.89
Specific gravity
—
—
Streak
—
Vitreous
Luster
—
On {010}, poor
Cleavage
—
P2_1/c
Space group
—
Halotrichite
Structural group
—
Hth · Grandfathered
IMA
—
1777
Named in
—
Colorless to white, pale gray, pale yellow, pale green; colorless in transmitted light
Typical colors
—
Fe · Al · S · O · H
Elements
—