Ekatite

Ekatite


Composition: (Fe3+,Fe2+,Zn)12(OH)6(AsO3)6[AsO3,SiO3(OH)]2
Crystal System : Hexagonal
Colours: Brownish-black
Lustre : Vitreous
Hardness (H) : 3
Year of Discovery: 1998
IMA Number: 1998-024
IMA Status: Approved
Discovered By: Michael Grieser (German collector)
Named for: Dieter Ekat (Namibian mining engineer)
References: Keller (2001)

Tsumeb is the Type Locality

Distribution

Extremely rare. Reported to be from the "deep levels" of the mine, and believed to be from the second oxidation zone (?)

Occurrence

  • Supergene
  • 2nd Oxidation Zone

Paragenetic and General Notes

Ekatite is one of the rarer arsenite minerals discovered from Tsumeb. The original specimen was submitted for study by Michael Grieser, a German collector but, during the course of study, a second specimen was provided by Herbert Nägele, of Windhoek, Namibia, who was also the original source of the Grieser specimen. Ekatite occurs on a matrix of chalcocite and quartz, as small radiating sprays of striated brownish-black needles. Ekatite is structurally related to phosphoellenbergerite, ellenbergerite and holtedahlite, as well as to several transition-metal tellurites, selenites and phosphites.