VS
Name
—
(NH₄)Al₃(SO₄)₂(OH)₆
Formula
—
Mineral Species
Entry type
—
Sulfates
Chemical class
—
Hexagonal
Crystal system
—
2–3
Mohs hardness
—
2.4
Specific gravity
—
White
Streak
—
Vitreous
Luster
—
On [{0001}, perfect.] (by analogy with the alunite group)
Cleavage
—
R-3m
Space group
—
Alunite-Alunite
Structural group
—
Aalu · Approved
IMA
—
1986
Named in
—
Grayish white; colorless in thin section
Typical colors
—
N · H · Al · S · O
Elements
—