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1 results

  • The crystal structure of brunogeierite, Fe2GeO4 spinel

  • M. D. Welch, M. A. Cooper, F. C. Hawthorne
  • Journal:
    Mineralogical Magazine / Volume 65 / Issue 3 / June 2001
    Published online by Cambridge University Press:
    05 July 2018, pp. 441-444

  • 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.