The new one-dimensional oxides Ca4-xNixIrO6 (x = 0.1, 0.2, 0.3, 0.4) have been synthesized by standard solid-state reactions. The compounds crystallize with trigonal (rhombohedral) symmetry in the space group R(3) over bar c, Z = 6, for Ca3.9Ni0.1IrO6 a = 9.32009(7) Angstrom, c 11.19945(9) Angstrom:, for Ca3.8Ni0.2IrO6 a = 9.30830(7) Angstrom, c = 11.1688(1) Angstrom; for Ca3.7Ni0.3IrO6 a 9.30142(7) Angstrom, c = 11.1509(1) Angstrom; for Ca3.6Ni0.4IrO6 a = 9.29038(7)Angstrom .c 11.12126(9)Angstrom. Ca4-xNixIrO6 (x = 0.1,0.2, 0.3, 0.4) are isotypic to compounds of the A(4)ptO(6) (A Ca, Sr, BA) structure type. All the structures have been determined by Rietveld refinement of powder X-ray diffraction data. The structure consists of infinite one-dimensional chains of alternating face-sharing IrO6 octahedra and (Ca/Ni)O-6 trigonal prisms. The chains are separated by the calcium cations, which are in a distorted square antiprismatic coordination. Magnetic measurements revealed that the samples of Ca4-xNixIrO6 (X = 0.1, 0.2, 0.3, 0.4) follow Curie-Weiss behavior at temperatures above 100 K, with mu (eff) values consistent with an oxidation state of +4 for Ir and +2 for Ni. The compounds Ca4-xNixIrO6 (X = 0. 1, 0.2, 0.3) undergo a single antiferromagnetic transition between T-N = 5 and 10 K. Ca4-xNixIrO6 (x = 0.4) undergoes two antiferromagnetic transitions at approximately T-NI = 13 K and T-N2 = 5 K.