A new binary metal borate compound, dicobalt nickel orthoborate, Co2Ni(BO3)(2) has been successfully synthesized by thermally-induced solid-state chemical reaction at 900 degrees C between the initial reactants of Co(NO3)(2)center dot 6H(2)O, Ni(NO3)(2)center dot 6H(2)O and H3BO3 (mol ratio 2:1:2). The product was structurally characterized by powder X-ray diffraction technique. Co2Ni(BO3)(2) crystallizes in the kotoite type and isostructural with the chemical formula M-3(BO3)(2) where M=Mg, Co and Ni. Co2Ni(BO3)(2) belongs to the orthorhombic crystal system with the refined unit cell parameters of a = 5.444(8), b = 8.404(0), c =4.504(1) angstrom, Z = 2 and space group was determined as Pnmn. FTIR, elemental analysis and thermal analysis were also discussed in the article. (C) 2007 Elsevier B.V. All rights reserved.