Clinoclase


Composition: Cu2+3(AsO4)(OH)3
Crystal System : Monoclinic
Colours: Greenish-blue
Lustre : Vitreous, pearly
Hardness (H) : 2.5-3.0
Specific Gravity (S.G) : 4.38
References: Maucher (1908)

Distribution

Extremely rare. Reported by Maucher (1908) from the first oxidation zone.

Occurrence

  • Supergene
  • 1st Oxidation Zone

Paragenetic and General Notes

Despite Maucher's (1908) early identification of clinoclase, it was not encountered again on Tsumeb material for more than a century. Zindel (2010) identified clinoclase in fractures and cavities on a specimen from the Schiffner collection. The clinoclase forms small spots and "crystal lawns" consisting of tiny prismatic, partly radiating highly glossy crystals, pale-blue on the surface of the specimen and dark-blue in the fractures, apparently due to its being protected from the light. Malachite, and "an arsentsumebite-like and cuprite-like mineral are associated with clinoclase." (Von Bezing et al., 2014).