Kegelite

Kegelite


Composition: Pb8Al4Si8(SO4)2(CO3)4(OH)8O20
T154
Very rare. The type specimen is from the second oxidation zone.
Crystal System : Monoclinic; (ps. Hexagonal)
Colours: Colourless, white, creamy-white
Lustre : Pearly
Specific Gravity (S.G) : 4.5
Year of Discovery: 1974
IMA Number: 1974-042
IMA Status: Redefined
Discovered By: Fritz Kaufmann (Tsumeb mineral collector)
Named for: Freidrich Wilhelm Kegel (Tsumeb general manager and OMEG director)

Tsumeb is the Type Locality

Distribution

Very rare. The type specimen is from the second oxidation zone.

Occurrence

  • Supergene
  • 2nd Oxidation Zone

Paragenetic and General Notes

Kegelite was the first lead silicate described from Tsumeb (Medenbach and Schmetzer, 1976).

Keller (1977) recognises the following "rare mineral paragenesis": primary sulphides >> wulfenite >> alamosite >> kegelite >> leadhillite >> cerussite.