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The crystal structure of brunogeierite, Fe2GeO4 spinel

Published online by Cambridge University Press:  05 July 2018

M. D. Welch ,
M. A. Cooper  and
F. C. Hawthorne
M. D. Welch*
Affiliation:
Department of Mineralogy, The Natural History Museum, Cromwell Road, London SW7 5BD, UK Department of Geological Sciences, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2
M. A. Cooper
Affiliation:
Department of Geological Sciences, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2
F. C. Hawthorne
Affiliation:
Department of Geological Sciences, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2
*
*E-mail: markwelch@nhm.ac.uk
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Abstract

Brunogeierite, Fe2GeO4, a = 8.4127(7) Å, V = 595.4(1) Å3, is a rare germanate spinel from Tsumeb, Namibia. Its structure has been refined to an R index of 2.2%. The oxygen parameter, u, is 0.2466(1), indicating nearly ideal cubic close-packing of oxygen atoms. There is exact agreement between the observed a unit-cell dimension and that calculated from the observed Ge–O and Fe–O bond lengths. The cations Ge and Fe are fully ordered at tetrahedral (A) and octahedral (B) sites, respectively, in keeping with synthetic germanate spinels, all of which are fully-ordered normal spinels.

Keywords

brunogeieritespinelcrystal structure
Type
Research Article
Information
Mineralogical Magazine , Volume 65 , Issue 3 , June 2001 , pp. 441 - 444
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2001

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References

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