Mineral - Chalcophyllit
Chalcophyllit
Chemical Properties
Mineral Class
Arsenates
Toxicity
middle
Formula
Cu₁₈Al₂(AsO₄)₄(SO₄)₃(OH)₂₄ · 36H₂O
Unit Cell
Physical Properties
Hardness
2
Streak
greenblueblue green
Density
Normal (2-3,5)
Cleavage
Fracture
Tenacity
Brittle
Optical Properties
Color
greenblue
Birefringence
0.066
Luster
Vitreous,
Adamantine
Transparency
translucent,
transparent
Pleochroism
Geomineralogical Properties
Crystal System
trigonal
Point Group
rhombohedral - 3
Space Group
R 3 (148)
Habit
tabular
Formation
In the oxidation zone of Cu-rich arsenic deposits
Paragenesis
Twinning
Rarity
Rarely
Synonyms
Chalcophyllit