MgMn2O4 crystallizes in the monoclinic C2/m space group. Mg(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form MgO6 octahedra that share corners with six equivalent Mn(1)O6 octahedra, edges with two equivalent Mg(1)O6 octahedra, and edges with six equivalent Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 4-30°. Mn(1) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form distorted MnO6 octahedra that share corners with three equivalent Mg(1)O6 octahedra, edges with three equivalent Mg(1)O6 octahedra, and edges with six equivalent Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 4-30°. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Mg(1) and three equivalent Mn(1) atoms to form a mixture of edge and corner-sharing OMg2Mn3 square pyramids. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1) and three equivalent Mn(1) atoms.
MgMn2O4 crystallizes in the monoclinic C2/m space group. Mg(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form MgO6 octahedra that share corners with six equivalent Mn(1)O6 octahedra, edges with two equivalent Mg(1)O6 octahedra, and edges with six equivalent Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 4-30°. Both Mg(1)-O(2) bond lengths are 2.11 Å. All Mg(1)-O(1) bond lengths are 2.12 Å. Mn(1) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form distorted MnO6 octahedra that share corners with three equivalent Mg(1)O6 octahedra, edges with three equivalent Mg(1)O6 octahedra, and edges with six equivalent Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 4-30°. There are two shorter (2.00 Å) and one longer (2.43 Å) Mn(1)-O(1) bond length. There are two shorter (1.95 Å) and one longer (2.22 Å) Mn(1)-O(2) bond length. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Mg(1) and three equivalent Mn(1) atoms to form a mixture of edge and corner-sharing OMg2Mn3 square pyramids. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1) and three equivalent Mn(1) atoms.