Chudobaite


Composition: (Mg,Zn)5[AsO3(OH)]2(AsO4)2.10H2O
(Mg,Zn)5[AsO3(OH)]2(AsO4)2.10H2O
Crystal System : Triclinic
Colours: Colourless, white, rose-pink
Hardness (H) : 2.5-3.0
Year of Discovery: 1960
IMA Number: 1962 s.p.
IMA Status: Approved
Discovered By: Hugo Strunz (German mineralogist)
Named for: Karl F. Chudoba (German mineralogist)
References: Strunz (1960a)

 Tsumeb is the Type Locality

Distribution

Extremely rare. Second and third oxidation zones.

Occurrence

  • Supergene
  • 2nd Oxidation Zone
  • 3rd Oxidation Zone

Notable Finds

The type specimen is from "the 1000 m level" (= 31 Level) in the second oxidation zone (Strunz, 1960), and comprises pinkish crystals of chudobaite with cuprian adamite, olivenite, and conichalcite. In the third oxidation zone (44 Level ?) chudobaite occurs as colourless-white material in the cores of zoned cuprian adamite crystals (Gebhard, 1999) and as colourless crystals on ferrilotharmeyerite accompanying cuprian adamite. Chudobaite has also been found as colourless crystals embedded in chalcocite (Gebhard, op.cit.).

Paragenetic and General Notes

The type specimen, with rose-coloured, equant crystals to 5mm is now considered to be atypical (Gebhard, 1999). Colourless crystals to 1mm, and the presence of chudobaite in the cores of cuprian adamite crystals are the more common modes of occurrence.