VS
Name
—
MgAl₂(SO₄)₄·22H₂O
Formula
—
Mineral Species
Entry type
—
Sulfates
Chemical class
—
Monoclinic
Crystal system
—
1.5
Mohs hardness
—
1.73–1.79
Specific gravity
—
—
Streak
—
Vitreous
Luster
—
Poor on {010}
Cleavage
—
P2_1/c
Space group
—
Halotrichite
Structural group
—
Pkg · Grandfathered
IMA
—
1844
Named in
—
Colorless, white; may be pale shades of yellow, green, or red from metallic impurities
Typical colors
—
Mg · Al · S · O · H
Elements
—