Garnet-type Na 3 Te 2 (FeO 4 ) 3 .

Na 3 Te 2 (FeO 4 ) 3 or Na 3 Te 2 Fe 3 O 12 , tris-odium ditellurium(VI) triiron(III) dodeca-oxide, was obtained in the form of single-crystals under hydro-thermal conditions. Na 3 Te 2 (FeO 4 ) 3 adopts the garnet structure type in space group Ia d and comprises one Na (multiplicity 24, Wyckoff letter c , site symmetry 2.22), one Te (16 a , ..), one Fe (24 d , ..) and one O atom (96 h , 1) in the asymmetric unit. The three-dimensional framework structure is built of [TeO 6 ] octa-hedra and [FeO 4 ] tetra-hedra by vertex-sharing. The larger Na + cations are situated in the inter-stices of the framework and are eightfold coordinated in the form of a distorted dodeca-hedron. Qu-anti-tative structural comparisons with isotypic Na 3 Te 2 [(Fe 0.5 Al 0.5 )O 4 ] 3 and Na 3 Te 2 (GaO 4 ) 3 show a high degree of similarity between the three crystal structures.