FeNiO3 is Ilmenite structured and crystallizes in the trigonal R-3 space group. Fe(1) is bonded to six equivalent O(1) atoms to form FeO6 octahedra that share corners with nine equivalent Ni(1)O6 octahedra, edges with three equivalent Fe(1)O6 octahedra, and  a faceface with one Ni(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 44-60°. Ni(1) is bonded to six equivalent O(1) atoms to form distorted NiO6 octahedra that share corners with nine equivalent Fe(1)O6 octahedra, edges with three equivalent Ni(1)O6 octahedra, and  a faceface with one Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 44-60°. O(1) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Fe(1) and two equivalent Ni(1) atoms.
FeNiO3 is Ilmenite structured and crystallizes in the trigonal R-3 space group. Fe(1) is bonded to six equivalent O(1) atoms to form FeO6 octahedra that share corners with nine equivalent Ni(1)O6 octahedra, edges with three equivalent Fe(1)O6 octahedra, and  a faceface with one Ni(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 44-60°. There are three shorter (1.94 Å) and three longer (2.03 Å) Fe(1)-O(1) bond lengths. Ni(1) is bonded to six equivalent O(1) atoms to form distorted NiO6 octahedra that share corners with nine equivalent Fe(1)O6 octahedra, edges with three equivalent Ni(1)O6 octahedra, and  a faceface with one Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 44-60°. There are three shorter (2.03 Å) and three longer (2.14 Å) Ni(1)-O(1) bond lengths. O(1) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Fe(1) and two equivalent Ni(1) atoms.