VS
Name
—
(NH₄)Al(SO₄)₂·12H₂O
Formula
—
Mineral Species
Entry type
—
Sulfates
Chemical class
—
Cubic
Crystal system
—
1.5
Mohs hardness
—
1.645
Specific gravity
—
—
Streak
—
Vitreous, silky if fibrous
Luster
—
—
Cleavage
—
Pa3
Space group
—
Alum
Structural group
—
Tmi · Grandfathered
IMA
—
1853
Named in
—
Colorless to white; colorless in transmitted light
Typical colors
—
N · H · Al · S · O
Elements
—