Original paper

Brunogeierit, ein Germanium-Ferritspinell von Tsumeb

[Brunogeierite, a germanium-ferrite-spinel from Tsumeb]

Ottemann, Joachim; Nuber, Bernhard

Image of first page of: Brunogeierite, a germanium-ferrite-spinel from Tsumeb

Neues Jahrbuch für Mineralogie - Monatshefte Jg. 1972 Heft 6 (1972), p. 263 - 267

6 references

published: Aug 9, 1972

DOI: 10.1127/njmm/1972/1972/263

BibTeX file

ArtNo. ESP156197206004, Price: 19.00 €

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Kurzfassung

Im Zuge laufender Untersuchungen an problematischen Mineralbildungen von der Tsumeb-Mine in Südwestafrika (B. H. GEIER & J. OTTEMANN, 1970 und 1971) wurde ein bisher unbekanntes, oxidisches Germanium-Mineral festgestellt.

Abstract

The new germanium-mineral occurs in the lower partly oxidized zones of the Tsumeb orebody, South-West-Africa, mostly as rims encrusting tennantite which encloses renierite. These grains are almost always surrounded with stottite. The mineral is opaque and gray in colour. The hardness is much higher than that of tennantite and stottite. The reflectivity is lower than that of magnetite. Electron microprobe analyses of homogeneous grains from two polished sections gave GeO2 37.0; 40.5 and FeO (total iron) 63.8; 60.7 percent corresponding to: (GeFe2O4)x(Fe3O4)1-x, where x = 0.87; 0.95. The X-ray powder data are indexed on a cubic cell, a0 = 8.409 ± 0.004 Å, space group O 7h — Fd3m, Z = 8, G. calc. 5.51. The new mineral is a germanium-ferrite-spinel and was named for Dr. Bruno H. Geier, chief-mineralogist of the Tsumeb Corp., who has done very much to further the study of the mineral-paragenesis at Tsumeb.

Keywords

oxidized zone • grains • stottite • tennantite • electron microprobe • Tsumeb orebody • Mineralbildung • Untersuchung • Tsumeb-Mine • South-West-Africa • Südwestafrika