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The crystal structures of triclinic Ca 5 Ge 3 O 11  and triclinic wollastonite-type CaGeO 3  have been determined by X-ray diffraction using single crystals grown from a K 2 MoO 4  flux. Ca 5 Ge 3 O 11  is closely related to monoclinic Ca 5 (Ge,Si) 3 O 11  and crystallizes in the  C [unk] space group with the cell parameters:  a  = 10.855(2) Å,  b  = 8.715(2) Å,  c  = 10.998(2) Å,  α  = 90.60(3)°,  β  = 96.49(3)°,  γ  = 90.17(3)°,  Z  = 4,  wR ( F  2 ) = 0.080 for 4877 unique reflections. Ca 5 Ge 3 O 11  is a mixed-anion germanate containing single and double tetrahedra, with a structural formula written as Ca 5 [GeO 4 ] [Ge 2 O 7 ]. CaGeO 3  is isostructural with CaSiO 3 , wollastonite-1T, and crystallizes in the  P [unk] space group with the cell parameters:  a  = 7.269(2) Å,  b  = 7.526(2) Å,  c  = 8.094(2) Å,  α  = 103.44(3)°,  β  = 94.42(3)°,  γ  = 90.11(3)°,  Z  = 6,  wR ( F  2 ) = 0.074 for 9279 unique reflections. The CaGeO 3  structure contains tetrahedral dreier single chains corresponding to the structural formula Ca 3 {uB ∞  1 }[Ge 3 O 9 ]. The bonding in the two compounds is analyzed in terms of a comparison between observed bond valences and bond valences predicted from the bond topology.

Crystal structures of Ca 5 Ge 3 O 11 and wollastonite-type GaGeO 3