MgMn3FeO8 crystallizes in the monoclinic Cm space group. Mg(1) is bonded in a distorted rectangular see-saw-like geometry to one Fe(1), one O(3), and two equivalent O(2) atoms. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form edge-sharing MnO6 octahedra. In the second Mn site, Mn(2) is bonded to one O(1), one O(6), two equivalent O(2), and two equivalent O(4) atoms to form edge-sharing MnO6 octahedra. Fe(1) is bonded in a 4-coordinate geometry to one Mg(1), one O(5), and two equivalent O(4) atoms. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Mn(2) and two equivalent Mn(1) atoms. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one Mg(1), one Mn(1), and one Mn(2) atom. 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 T-shaped geometry to one Mn(1), one Mn(2), and one Fe(1) atom. In the fifth O site, O(5) is bonded in a distorted T-shaped geometry to two equivalent Mn(1) and one Fe(1) atom. In the sixth O site, O(6) is bonded in a distorted trigonal non-coplanar geometry to one Mn(2) and two equivalent Mn(1) atoms.
MgMn3FeO8 crystallizes in the monoclinic Cm space group. Mg(1) is bonded in a distorted rectangular see-saw-like geometry to one Fe(1), one O(3), and two equivalent O(2) atoms. The Mg(1)-Fe(1) bond length is 2.77 Å. The Mg(1)-O(3) bond length is 1.97 Å. Both Mg(1)-O(2) bond lengths are 1.97 Å. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form edge-sharing MnO6 octahedra. The Mn(1)-O(1) bond length is 1.95 Å. The Mn(1)-O(2) bond length is 1.92 Å. The Mn(1)-O(3) bond length is 1.92 Å. The Mn(1)-O(4) bond length is 2.00 Å. The Mn(1)-O(5) bond length is 2.00 Å. The Mn(1)-O(6) bond length is 1.97 Å. In the second Mn site, Mn(2) is bonded to one O(1), one O(6), two equivalent O(2), and two equivalent O(4) atoms to form edge-sharing MnO6 octahedra. The Mn(2)-O(1) bond length is 1.95 Å. The Mn(2)-O(6) bond length is 1.97 Å. Both Mn(2)-O(2) bond lengths are 1.92 Å. Both Mn(2)-O(4) bond lengths are 1.99 Å. Fe(1) is bonded in a 4-coordinate geometry to one Mg(1), one O(5), and two equivalent O(4) atoms. The Fe(1)-O(5) bond length is 1.89 Å. Both Fe(1)-O(4) bond lengths are 1.89 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Mn(2) and two equivalent Mn(1) atoms. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one Mg(1), one Mn(1), and one Mn(2) atom. 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 T-shaped geometry to one Mn(1), one Mn(2), and one Fe(1) atom. In the fifth O site, O(5) is bonded in a distorted T-shaped geometry to two equivalent Mn(1) and one Fe(1) atom. In the sixth O site, O(6) is bonded in a distorted trigonal non-coplanar geometry to one Mn(2) and two equivalent Mn(1) atoms.