Aurichalcite, (w. Hemimorphite and Hydrozincite)

Aurichalcite


Composition: (Zn,Cu2+)5(CO3)2(OH)6
Crystal System : Monoclinic
Colours: Blue-white, pale-blue, greenish-blue
Lustre : Silky, pearly
Hardness (H) : 1-2
Specific Gravity (S.G) : 3.96
References: Gebhard (1999)

Distribution

Rare. Open pit, and upper portion of the first oxidation zone.

Occurrence

  • Supergene
  • 1st Oxidation Zone

Paragenetic and General Notes

A very rare mineral at depth, but more common in the near surface environment (due to lower pCO2), where it occurred in a paragenesis with hemimorphite and hydrozincite. Less commonly in association with smithsonite.

Aurichalcite has been reported to form pseudomorphs after azurite (rare; Weber, 1977).