CoBi6(SO8)2 crystallizes in the monoclinic C2 space group. Co(1) is bonded to two equivalent O(3) and two equivalent O(7) atoms to form distorted CoO4 tetrahedra that share corners with two equivalent S(1)O4 tetrahedra. There are three inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(8), and one O(9) atom. In the second Bi site, Bi(2) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(7), one O(8), and one O(9) atom. In the third Bi site, Bi(3) is bonded in a 4-coordinate geometry to one O(4), one O(7), one O(8), and one O(9) atom. S(1) is bonded to one O(3), one O(4), one O(5), and one O(6) atom to form SO4 tetrahedra that share  a cornercorner with one Co(1)O4 tetrahedra. There are nine inequivalent O sites. In the first O site, O(9) is bonded in a distorted trigonal non-coplanar geometry to one Bi(1), one Bi(2), and one Bi(3) atom. In the second O site, O(1) is bonded to two equivalent Bi(1) and two equivalent Bi(2) atoms to form edge-sharing OBi4 tetrahedra. In the third O site, O(2) is bonded to two equivalent Bi(1) and two equivalent Bi(2) atoms to form edge-sharing OBi4 tetrahedra. In the fourth O site, O(3) is bonded in a bent 150 degrees geometry to one Co(1) and one S(1) atom. In the fifth O site, O(4) is bonded in a distorted single-bond geometry to one Bi(3) and one S(1) atom. In the sixth O site, O(5) is bonded in a single-bond geometry to one S(1) atom. In the seventh O site, O(6) is bonded in a single-bond geometry to one S(1) atom. In the eighth O site, O(7) is bonded in a distorted trigonal planar geometry to one Co(1), one Bi(2), and one Bi(3) atom. In the ninth O site, O(8) is bonded in a distorted trigonal non-coplanar geometry to one Bi(1), one Bi(2), and one Bi(3) atom.
CoBi6(SO8)2 crystallizes in the monoclinic C2 space group. Co(1) is bonded to two equivalent O(3) and two equivalent O(7) atoms to form distorted CoO4 tetrahedra that share corners with two equivalent S(1)O4 tetrahedra. Both Co(1)-O(3) bond lengths are 2.07 Å. Both Co(1)-O(7) bond lengths are 1.93 Å. There are three inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(8), and one O(9) atom. The Bi(1)-O(1) bond length is 2.28 Å. The Bi(1)-O(2) bond length is 2.25 Å. The Bi(1)-O(8) bond length is 2.23 Å. The Bi(1)-O(9) bond length is 2.31 Å. In the second Bi site, Bi(2) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(7), one O(8), and one O(9) atom. The Bi(2)-O(1) bond length is 2.45 Å. The Bi(2)-O(2) bond length is 2.50 Å. The Bi(2)-O(7) bond length is 2.32 Å. The Bi(2)-O(8) bond length is 2.25 Å. The Bi(2)-O(9) bond length is 2.24 Å. In the third Bi site, Bi(3) is bonded in a 4-coordinate geometry to one O(4), one O(7), one O(8), and one O(9) atom. The Bi(3)-O(4) bond length is 2.55 Å. The Bi(3)-O(7) bond length is 2.16 Å. The Bi(3)-O(8) bond length is 2.26 Å. The Bi(3)-O(9) bond length is 2.21 Å. S(1) is bonded to one O(3), one O(4), one O(5), and one O(6) atom to form SO4 tetrahedra that share  a cornercorner with one Co(1)O4 tetrahedra. The S(1)-O(3) bond length is 1.51 Å. The S(1)-O(4) bond length is 1.50 Å. The S(1)-O(5) bond length is 1.47 Å. The S(1)-O(6) bond length is 1.50 Å. There are nine inequivalent O sites. In the first O site, O(9) is bonded in a distorted trigonal non-coplanar geometry to one Bi(1), one Bi(2), and one Bi(3) atom. In the second O site, O(1) is bonded to two equivalent Bi(1) and two equivalent Bi(2) atoms to form edge-sharing OBi4 tetrahedra. In the third O site, O(2) is bonded to two equivalent Bi(1) and two equivalent Bi(2) atoms to form edge-sharing OBi4 tetrahedra. In the fourth O site, O(3) is bonded in a bent 150 degrees geometry to one Co(1) and one S(1) atom. In the fifth O site, O(4) is bonded in a distorted single-bond geometry to one Bi(3) and one S(1) atom. In the sixth O site, O(5) is bonded in a single-bond geometry to one S(1) atom. In the seventh O site, O(6) is bonded in a single-bond geometry to one S(1) atom. In the eighth O site, O(7) is bonded in a distorted trigonal planar geometry to one Co(1), one Bi(2), and one Bi(3) atom. In the ninth O site, O(8) is bonded in a distorted trigonal non-coplanar geometry to one Bi(1), one Bi(2), and one Bi(3) atom.