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BaGe[Ge 3 O 9 ] is trigonal, space group P3, with lattice constants a = 11.61, c = 4.74 Å, and Z = 3. The structure was established by three-dimensional Patterson and electron density syntheses. Three-dimensional least-squares refinement resulted in a final R value of 6.8 percent (observed data only). The previously proposed structural relationship of this compound with benitoite, BaTiSi 3 O 9 , has been confirmed. The structure can be considered as composed of Ge 3 O 9 rings, in which the Ge is tetrahedrally coordinated, linked through octahedrally coordinated Ge atoms to form a three-dimensional Ge-O network. All Ge polyhedra are linked by corner sharing. The Ba ions occupy positions in channels of the network.

Crystal structure of BaGe [Ge3 O9] and its relation to benitoite