Hydrozincite

Hydrozincite


Composition: Zn5(CO3)2(OH)6
Crystal System : Monoclinic
Colours: White, grey, pale-green
Lustre : Dull
Hardness (H) : 2.0-2.5
Specific Gravity (S.G) : 3-4

Distribution

Very rare. Mainly at outcrop and in the first oxidation zone, but also in the second oxidation zone.

Occurrence

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

Paragenetic and General Notes

Hydrozincite occurs in a characteristic paragenesis, with aurichalcite and hemimorphite, in the upper portion of the first oxidation zone (Gebhard, 1999).

Hydrozincite is found as white to grey crusts, stains, powdery masses and coatings on smithsonite and, rarely, as efflorescences of minute, tabular crystals (Pinch and Wilson, 1977). 

Hydrozincite also occurs in the type assemblage for reinerite, on 29 Level in the second oxidation zone (Geier and Weber, 1958).