Hydrocerussite

Hydrocerussite


Composition: Pb3(CO3)2(OH)2
Crystal System : Trigonal
Colours: Colourless, white, grey
Lustre : Adamantine, sub-vitreous, chalky
Hardness (H) : 3.5
Specific Gravity (S.G) : 6.8
References: Keller (1977a)

Distribution

Rare. Documented from the second and third oxidation zones; its presence in the first oxidation zone is uncertain. It was first recorded in the literature as recently as the late 1970s (Keller, 1977).

Occurrence

  • Hypogene
  • 2nd Oxidation Zone
  • 3rd Oxidation Zone

Notable Finds

The so-called "Lead Pocket" on 43 Level in the third oxidation zone was noted, inter alia, for hydrocerussite replacing cerussite crystals to varying degrees.

Paragenetic and General Notes

As surface coatings on cerussite (and occasionally on anglesite), and as an alteration product of cerussite.  The oxides of lead - litharge, massicott and minium - are occasionally present on hydrocerussite, and particularly on specimens from the 43 Level discovery.

Hydrocerussite is reported to form pseudomorphs after the following minerals:  anglesite (rare, and usually as a surface replacement); cerussite (common, though usually as a surface / partial replacement).