Clinoclase

Formula: Cu3(AsO4)(OH)3
Anhydrous arsenate containing hydroxyl
Specific gravity: 4.38
Hardness: 2½ to 3
Streak: Bluish green
Colour: Dark greenish black to greenish blue
Solubility:
Environments:

Hydrothermal environments

Clinoclase is a rare secondary mineral in the oxidized zone of some arsenic-rich hydrothermal base-metal deposits. At the type locality, Wheal Gorland, Cornwall, England, clinoclase is associated with olivenite, liroconite and cornwallite. At the Clara Mine, Near Wolfach in the Black Forest, Germany, clinoclase is associated with olivenite, conichalcite, malachite and azurite, all on a baryte-rich matrix.
Common impurities: P