MgMn3BiO8 crystallizes in the trigonal R3m space group. Mg(1) is bonded in a distorted rectangular see-saw-like geometry to one Bi(1) and three equivalent O(3) atoms. Mn(1) is bonded to one O(2), one O(4), two equivalent O(1), and two equivalent O(3) atoms to form edge-sharing MnO6 octahedra. Bi(1) is bonded in a 4-coordinate geometry to one Mg(1) and three equivalent O(1) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to two equivalent Mn(1) and one Bi(1) atom. In the second O site, O(2) is bonded in a distorted T-shaped geometry to three equivalent Mn(1) atoms. In the third O site, O(3) is bonded in a distorted T-shaped geometry to one Mg(1) and two equivalent Mn(1) atoms. In the fourth O site, O(4) is bonded in a distorted trigonal non-coplanar geometry to three equivalent Mn(1) atoms.
MgMn3BiO8 crystallizes in the trigonal R3m space group. Mg(1) is bonded in a distorted rectangular see-saw-like geometry to one Bi(1) and three equivalent O(3) atoms. The Mg(1)-Bi(1) bond length is 3.06 Å. All Mg(1)-O(3) bond lengths are 1.94 Å. Mn(1) is bonded to one O(2), one O(4), two equivalent O(1), and two equivalent O(3) atoms to form edge-sharing MnO6 octahedra. The Mn(1)-O(2) bond length is 1.96 Å. The Mn(1)-O(4) bond length is 1.97 Å. Both Mn(1)-O(1) bond lengths are 2.07 Å. Both Mn(1)-O(3) bond lengths are 1.97 Å. Bi(1) is bonded in a 4-coordinate geometry to one Mg(1) and three equivalent O(1) atoms. All Bi(1)-O(1) bond lengths are 2.08 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to two equivalent Mn(1) and one Bi(1) atom. In the second O site, O(2) is bonded in a distorted T-shaped geometry to three equivalent Mn(1) atoms. In the third O site, O(3) is bonded in a distorted T-shaped geometry to one Mg(1) and two equivalent Mn(1) atoms. In the fourth O site, O(4) is bonded in a distorted trigonal non-coplanar geometry to three equivalent Mn(1) atoms.