Chalcocite

Chalcocite


Composition: Cu2S
Crystal System : Monoclinic
Lustre : Metallic
Hardness : 2.5-3.0
Specific Gravity : 5.5-5.8

Occurrence

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

Notable Finds

Solid masses of chalcocite to 20 cubic metres occurred in the first oxidation zone. Acicular crystals (unusual habit) were found in the second oxidation zone. Large and well-formed crystals were found in the third oxidation zone, with perfect crystals to 40 mm found between 44 and 47 levels, some of them associated with stolzite and nickeloan siderite.