CaWNiO6 is trigonal omega-derived structured and crystallizes in the orthorhombic Pnn2 space group. Ca(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form distorted CaO6 octahedra that share corners with two equivalent W(1)O6 octahedra, corners with four equivalent Ni(1)O6 octahedra,  an edgeedge with one Ni(1)O6 octahedra, and edges with two equivalent W(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 31-39°. W(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form WO6 octahedra that share corners with two equivalent Ca(1)O6 octahedra, edges with two equivalent Ca(1)O6 octahedra, and faces with two equivalent Ni(1)O6 octahedra. The corner-sharing octahedral tilt angles are 38°. Ni(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form NiO6 octahedra that share corners with four equivalent Ca(1)O6 octahedra,  an edgeedge with one Ca(1)O6 octahedra, and faces with two equivalent W(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 31-39°. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Ca(1), one W(1), and one Ni(1) atom. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one Ca(1), one W(1), and one Ni(1) atom. In the third O site, O(3) is bonded in a distorted T-shaped geometry to one Ca(1), one W(1), and one Ni(1) atom.
CaWNiO6 is trigonal omega-derived structured and crystallizes in the orthorhombic Pnn2 space group. Ca(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form distorted CaO6 octahedra that share corners with two equivalent W(1)O6 octahedra, corners with four equivalent Ni(1)O6 octahedra,  an edgeedge with one Ni(1)O6 octahedra, and edges with two equivalent W(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 31-39°. Both Ca(1)-O(1) bond lengths are 2.44 Å. Both Ca(1)-O(2) bond lengths are 2.38 Å. Both Ca(1)-O(3) bond lengths are 2.33 Å. W(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form WO6 octahedra that share corners with two equivalent Ca(1)O6 octahedra, edges with two equivalent Ca(1)O6 octahedra, and faces with two equivalent Ni(1)O6 octahedra. The corner-sharing octahedral tilt angles are 38°. Both W(1)-O(1) bond lengths are 1.94 Å. Both W(1)-O(2) bond lengths are 1.99 Å. Both W(1)-O(3) bond lengths are 1.94 Å. Ni(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form NiO6 octahedra that share corners with four equivalent Ca(1)O6 octahedra,  an edgeedge with one Ca(1)O6 octahedra, and faces with two equivalent W(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 31-39°. Both Ni(1)-O(1) bond lengths are 1.94 Å. Both Ni(1)-O(2) bond lengths are 1.92 Å. Both Ni(1)-O(3) bond lengths are 1.95 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Ca(1), one W(1), and one Ni(1) atom. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one Ca(1), one W(1), and one Ni(1) atom. In the third O site, O(3) is bonded in a distorted T-shaped geometry to one Ca(1), one W(1), and one Ni(1) atom.