MgMn4O8 is beta indium sulfide-derived structured and crystallizes in the orthorhombic F222 space group. Mg(1) is bonded to four equivalent O(2) atoms to form MgO4 tetrahedra that share corners with twelve equivalent Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 59-61°. Mn(1) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form MnO6 octahedra that share corners with three equivalent Mg(1)O4 tetrahedra and edges with six equivalent Mn(1)O6 octahedra. There are two inequivalent O sites. In the first O site, O(2) is bonded to one Mg(1) and three equivalent Mn(1) atoms to form a mixture of distorted corner and edge-sharing OMgMn3 trigonal pyramids. In the second O site, O(1) is bonded in a distorted T-shaped geometry to three equivalent Mn(1) atoms.
MgMn4O8 is beta indium sulfide-derived structured and crystallizes in the orthorhombic F222 space group. Mg(1) is bonded to four equivalent O(2) atoms to form MgO4 tetrahedra that share corners with twelve equivalent Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 59-61°. All Mg(1)-O(2) bond lengths are 2.01 Å. Mn(1) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form MnO6 octahedra that share corners with three equivalent Mg(1)O4 tetrahedra and edges with six equivalent Mn(1)O6 octahedra. There are a spread of Mn(1)-O(1) bond distances ranging from 1.93-2.06 Å. There are a spread of Mn(1)-O(2) bond distances ranging from 1.99-2.12 Å. There are two inequivalent O sites. In the first O site, O(2) is bonded to one Mg(1) and three equivalent Mn(1) atoms to form a mixture of distorted corner and edge-sharing OMgMn3 trigonal pyramids. In the second O site, O(1) is bonded in a distorted T-shaped geometry to three equivalent Mn(1) atoms.