Mn3CoO8 is trigonal omega-derived structured and crystallizes in the cubic P4_332 space group. Mn(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form MnO6 octahedra that share edges with two equivalent Co(1)O6 octahedra and edges with four equivalent Mn(1)O6 octahedra. Co(1) is bonded to six equivalent O(1) atoms to form CoO6 octahedra that share edges with six equivalent Mn(1)O6 octahedra. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to two equivalent Mn(1) and one Co(1) atom. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to three equivalent Mn(1) atoms.
Mn3CoO8 is trigonal omega-derived structured and crystallizes in the cubic P4_332 space group. Mn(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form MnO6 octahedra that share edges with two equivalent Co(1)O6 octahedra and edges with four equivalent Mn(1)O6 octahedra. Both Mn(1)-O(2) bond lengths are 1.94 Å. There are two shorter (1.94 Å) and two longer (1.95 Å) Mn(1)-O(1) bond lengths. Co(1) is bonded to six equivalent O(1) atoms to form CoO6 octahedra that share edges with six equivalent Mn(1)O6 octahedra. All Co(1)-O(1) bond lengths are 1.97 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to two equivalent Mn(1) and one Co(1) atom. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to three equivalent Mn(1) atoms.