O'danielite


Composition: Na(Zn,Mg)3H2(AsO4)3
Crystal System : Monoclinic
Colours: Pale-violet
Lustre : Vitreous
Hardness (H) : 3
Year of Discovery: 1979
IMA Number: 1979-040
IMA Status: Approved
Discovered By: Bruno H. Geiger (Tsumeb mineralogist)
Named for: Herbert O'Daniel (German mineralogist)
References: Keller et al. (1981a)

Tsumeb is the Type Locality

Distribution

Extremely rare. The level from which the type specimen was recovered is not recorded, but it is almost certainly from the second oxidation zone.

Occurrence

  • Supergene
  • 2nd Oxidation Zone

Paragenetic and General Notes

According to Keller and Bartelke (1982), on the type specimen o'danielite is associated with a pink manganoan koritnigite, water-clear needles of prosperite, green conichalcite and cuprian adamite. 

Keller et al. (1981) proposed the following paragenetic sequence:  conichalcite >> adamite >> o'danielite >> prosperite >> koritnigite.