Clinoclase
ID: 11
Clinoclase
Chemical Formula
Cu₃(AsO₄)(OH)₃
Hardness (Mohs)
2 - 3
Crystal System
Monoclinic
Streak
Blue-green
Luster
Vitreous, silky
Diaphaneity
Translucent to opaque
Color
Dark blue to greenish-blue
Crystal Habit / Mode of Occurrence
Acicular, fibrous, or in crusts. Often found in the oxidized zones of copper deposits.
Fun Facts
Clinoclase is a relatively rare copper arsenate mineral. Because it contains arsenic, it is toxic.