Chalcanthite


Composition: Cu2+SO4.5H2O
Crystal System : Triclinic
Colours: Blue, green, white
Lustre : Vitreous, resinous
Hardness (H) : 2.5
Specific Gravity (S.G) : 2.286
References: Gebhard (1999)

Distribution

Rare. Most examples are from the first oxidation zone, but it also occurs in the second oxidation zone.

Occurrence

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

Notable Finds

As beautiful crystal and crystalline masses in the upper levels of the mine (Pinch and Wilson, 1977). In the second oxidation zone, on 35 Level, with anhydrite, lammerite, leightonite and thometzekite (Gebhard, 1999).

Paragenetic and General Notes

The unusual sulphate / arsenate paragenesis discovered on 35 Level, with anhydrite, lammerite, leightonite, and thometzekite is of special note.

Some examples of chalcanthite from Tsumeb are of post-mining origin.