VS
Name
—
CuAl₄(SO₄)(OH)₁₂·3H₂O
Formula
—
Mineral Species
Entry type
—
Sulfates
Chemical class
—
Monoclinic
Crystal system
—
2.5
Mohs hardness
—
2.29
Specific gravity
—
White
Streak
—
Vitreous to dull
Luster
—
On {100}, perfect
Cleavage
—
P2_1
Space group
—
Chalcoalumite
Structural group
—
Cca · Grandfathered
IMA
—
1925
Named in
—
Turquoise-green to Nile blue, pale gray to nearly colorless; in transmited light, colorless
Typical colors
—
Cu · Al · S · O · H
Elements
—