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The structure of dilead(II) diiron(III) digermanium(IV) oxide, with a minor (2Fe/Mg+Ge) substitution due to growth conditions, has been determined using flux-grown single crystals. Interesting features of the structure include an unsymmetrical splitting of the Pb site and a strong anisotropy of the bridging oxygen atom of the Ge2O7 group, both of which also occur in the structure of the silicate mineral melanotekite, Pb2Fe2Si2O9. These structural features can be associated with the stereoactivity of the Pb2+ lone pairs, which is found to be less pronounced in the germanate than in the silicate structure.

Supporting information

cif

Crystallographic Information File (CIF)
Contains datablock Pb2Fe2Ge2O9

hkl

Structure factor file (CIF format)
Contains datablock Pb2Fe2Ge2O9

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