Abstract
Structural refinements were performed on synthetic and natural Fe-Sb-oxides of MO 2 type according to the Rietveld method. The refinement in the P4 2 / mnm space group confirms that the synthetic phase (Fe 3 + Sb 5 + )O 4 , corresponding to squawcreekite, is characterised by a rutile-type structure. In contrast to the compositional and structural data (ideally Fe 2 + Sb 5 + 2O 6 with a trirutile-type structure) implicitly accepted by the IMA Commission on New Minerals and Mineral Names, also tripuhyite seems to crystallize with a rutile-type structure in the P4 2 /mnm space group and its composition is based on an equimolar ratio between Fe and Sb.
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