Composition: Pb2Fe3+(AsO4)2(OH)
Crystal System : Monoclinic
Colours: Honey-yellow, brown, green
Lustre : Sub-adamantine, sub-resinous, waxy
Hardness (H) : 4.5
Specific Gravity (S.G) : 6.54
Year of Discovery: Mid-1960s
IMA Number: 1977-014
IMA Status: Approved
Discovered By: Bruno H. Geier (Tsumeb mineralogist)
Named for: Composition/relationship
References: Abraham et al. (1978)

 Tsumeb is the Type Locality


Very rare. The (Tsumeb) type specimen is from 30 Level, in the second oxidation zone. (GrĂ¼be Clara, in Germany, shares type locality status.)


  • Supergene
  • 2nd Oxidation Zone

Paragenetic and General Notes

In dolomite breccia, with chalcocite and calcite. Forms small, platy, twinned crystals resembling tsumcorite.