VS
Name
—
Cu₁₈Al₂(AsO₄)₄(SO₄)₃(OH)₂₄·36H₂O
Formula
—
Mineral Species
Entry type
—
Arsenates
Chemical class
—
Hexagonal
Crystal system
—
2
Mohs hardness
—
2.67–2.69
Specific gravity
—
Pale green to bluish green
Streak
—
Vitreous to subadamantine, pearly on {0001}
Luster
—
{0001}, perfect, micaceous; {1011}, in traces
Cleavage
—
R-3
Space group
—
Chalcophyllite
Structural group
—
Chp · Grandfathered
IMA
—
1841
Named in
—
Emerald-green, grass-green, bluish green, blue; green in transmitted light
Typical colors
—
Cu · Al · As · O · S · H
Elements
—