MgMn3Zn2O8 crystallizes in the monoclinic C2/m space group. Mg(1) is bonded to two equivalent O(1) and four equivalent O(3) atoms to form MgO6 octahedra that share edges with two equivalent Mn(1)O6 octahedra and edges with four equivalent Mn(2)O6 octahedra. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to two equivalent O(2) and four equivalent O(3) atoms to form MnO6 octahedra that share edges with two equivalent Mg(1)O6 octahedra and edges with four equivalent Mn(2)O6 octahedra. In the second Mn site, Mn(2) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form distorted MnO6 octahedra that share edges with two equivalent Mg(1)O6 octahedra, edges with two equivalent Mn(1)O6 octahedra, and edges with two equivalent Mn(2)O6 octahedra. Zn(1) is bonded in a 3-coordinate geometry to one O(1) and two equivalent O(3) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded to one Mg(1), two equivalent Mn(2), and one Zn(1) atom to form a mixture of edge and corner-sharing OMgMn2Zn trigonal pyramids. In the second O site, O(2) is bonded in a trigonal non-coplanar geometry to one Mn(1) and two equivalent Mn(2) atoms. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Mn(1), one Mn(2), and one Zn(1) atom.
MgMn3Zn2O8 crystallizes in the monoclinic C2/m space group. Mg(1) is bonded to two equivalent O(1) and four equivalent O(3) atoms to form MgO6 octahedra that share edges with two equivalent Mn(1)O6 octahedra and edges with four equivalent Mn(2)O6 octahedra. Both Mg(1)-O(1) bond lengths are 2.06 Å. All Mg(1)-O(3) bond lengths are 2.09 Å. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to two equivalent O(2) and four equivalent O(3) atoms to form MnO6 octahedra that share edges with two equivalent Mg(1)O6 octahedra and edges with four equivalent Mn(2)O6 octahedra. Both Mn(1)-O(2) bond lengths are 1.97 Å. All Mn(1)-O(3) bond lengths are 1.94 Å. In the second Mn site, Mn(2) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form distorted MnO6 octahedra that share edges with two equivalent Mg(1)O6 octahedra, edges with two equivalent Mn(1)O6 octahedra, and edges with two equivalent Mn(2)O6 octahedra. Both Mn(2)-O(1) bond lengths are 1.97 Å. Both Mn(2)-O(2) bond lengths are 1.95 Å. Both Mn(2)-O(3) bond lengths are 2.33 Å. Zn(1) is bonded in a 3-coordinate geometry to one O(1) and two equivalent O(3) atoms. The Zn(1)-O(1) bond length is 1.92 Å. Both Zn(1)-O(3) bond lengths are 1.99 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded to one Mg(1), two equivalent Mn(2), and one Zn(1) atom to form a mixture of edge and corner-sharing OMgMn2Zn trigonal pyramids. In the second O site, O(2) is bonded in a trigonal non-coplanar geometry to one Mn(1) and two equivalent Mn(2) atoms. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Mn(1), one Mn(2), and one Zn(1) atom.