Co3SbO8 is Rutile-derived structured and crystallizes in the hexagonal P6_3mc space group. Co(1) is bonded to one O(3), one O(4), two equivalent O(1), and two equivalent O(2) atoms to form CoO6 octahedra that share corners with two equivalent Sb(1)O6 octahedra,  an edgeedge with one Sb(1)O6 octahedra, and edges with four equivalent Co(1)O6 octahedra. The corner-sharing octahedral tilt angles are 54°. Sb(1) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form SbO6 octahedra that share corners with six equivalent Co(1)O6 octahedra and edges with three equivalent Co(1)O6 octahedra. The corner-sharing octahedral tilt angles are 54°. There are four inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to two equivalent Co(1) and one Sb(1) atom. In the second O site, O(2) is bonded in a distorted T-shaped geometry to two equivalent Co(1) and one Sb(1) atom. In the third O site, O(3) is bonded in a distorted T-shaped geometry to three equivalent Co(1) atoms. In the fourth O site, O(4) is bonded in a trigonal non-coplanar geometry to three equivalent Co(1) atoms.
Co3SbO8 is Rutile-derived structured and crystallizes in the hexagonal P6_3mc space group. Co(1) is bonded to one O(3), one O(4), two equivalent O(1), and two equivalent O(2) atoms to form CoO6 octahedra that share corners with two equivalent Sb(1)O6 octahedra,  an edgeedge with one Sb(1)O6 octahedra, and edges with four equivalent Co(1)O6 octahedra. The corner-sharing octahedral tilt angles are 54°. The Co(1)-O(3) bond length is 1.87 Å. The Co(1)-O(4) bond length is 1.88 Å. Both Co(1)-O(1) bond lengths are 1.93 Å. Both Co(1)-O(2) bond lengths are 1.90 Å. Sb(1) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form SbO6 octahedra that share corners with six equivalent Co(1)O6 octahedra and edges with three equivalent Co(1)O6 octahedra. The corner-sharing octahedral tilt angles are 54°. All Sb(1)-O(1) bond lengths are 1.98 Å. All Sb(1)-O(2) bond lengths are 2.10 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to two equivalent Co(1) and one Sb(1) atom. In the second O site, O(2) is bonded in a distorted T-shaped geometry to two equivalent Co(1) and one Sb(1) atom. In the third O site, O(3) is bonded in a distorted T-shaped geometry to three equivalent Co(1) atoms. In the fourth O site, O(4) is bonded in a trigonal non-coplanar geometry to three equivalent Co(1) atoms.