Erikapohlite


Composition:

Cu3(Zn,Cu,Mg)4Ca2(AsO4)6·2H2O

Crystal System : Monoclinic
Colours: Deep blue
Year of Discovery: 2010
IMA Number: IMA2010-090
IMA Status: Approved
Discovered By: Georg Gebhard (German collector)
Named for: Erika Pohl-Ströher (German collector)

Tsumeb is the Type Locality

Distribution

Extremely rare. Third oxidation zone.

Occurrence

  • Supergene
  • 3rd Oxidation Zone

Paragenetic and General Notes

Erikapohlite was discovered on 44 Level, where it occurs as 0.7mm-wide seams of very thin, deep blue, lamellar microcrystals in granular quartz.   It is an oxidation product of tennantite.

Erikapohlite is the calcium-dominant analogue of keyite. Small zones in erikapohlite are Mg- or Cu-dominant, representing new species that have yet to be characterised. The type specimen was purchased by Georg Gebhard in Tsumeb, in 1994. The type assemblage includes quartz, lammerite, conichalcite, and an unknown amorphous, brownish, transparent Zn,Fe,Cu (Mg,Ca) arsenate.