Common. First, second and probably (?) third oxidation zones.
- 1st Oxidation Zone
- 2nd Oxidation Zone
- 3rd Oxidation Zone
Fine specimens of the lead-bearing variety "tarnowitzite", and the zinc-bearing "nicholsonite" were recovered from the first oxidation zone. Numerous specimens of pale-blue copper-bearing aragonite, commonly as sub-botryoidal crusts, are of post-mining origin.
Paragenetic and General Notes
Relatively pure aragonite forms slightly greenish to bluish needles and turquoise-coloured masses and crusts; it occurs only rarely as dull, prismatic, pseudo-hexagonal crystals, and is far more scarce than calcite (Pinch and Wilson, 1977).
Much more common than "pure" aragonite is the lead-bearing variety "tarnowitzite", which forms excellent cream-white prismatic crystals to to several centimetres, terminated by pseudohexagonal pyramids. The zinc-bearing variety "nicholsonite" also forms similar excellent crystals, typically buff-cream or very pale blue-green in colour.
The following minerals have been reported to form pseudomorphs after aragonite: malachite (rare); smithsonite (rare).