Olivenite, (in Chalcocite)

Olivenite


Composition: Cu2+2(AsO4)(OH)
Crystal System : Monoclinic
Lustre : Adamantine, vitreous
Hardness : 3
Specific Gravity : 4.38
References:

Bartelke (1976)

Occurrence

  • Supergene
  • 1st Oxidation Zone
  • 2nd Oxidation Zone
  • 3rd Oxidation Zone

Notable Finds

Spectacular examples of acicular olivenite on a matrix of malachite and copper arseantes were found in the outcrop and the upper levels of the first oxidation zone (ref. Klein collection # 1050; Harvard University # 106045). Klein (1938) made the observation that olivenite was common between surface and a depth of 100 m, typically associated with azurite and malachite. In this part of the mine, olivenite occurred mainly as radial masses, sometimes with drusy surfaces of crystal terminations. Gebhard (1999) noted blocky crystals of olivenite to 50 mm but did not specify where in the mine they were found. However, Bartelke (1976) comments that blackish-green iron-rich olivenite was common in the second oxidation zone. (See also the notes on zincolivenite and adamite.)