MgMn4Zn2O8 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(2), one O(3), and two equivalent O(6) atoms to form MgO4 tetrahedra that share  a cornercorner with one Mn(1)O6 octahedra, corners with two equivalent Mg(1)O4 tetrahedra, corners with four equivalent Zn(1)O5 trigonal bipyramids, edges with two equivalent Mn(2)O6 octahedra, and  an edgeedge with one Zn(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 34°. There are four inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(3), one O(5), two equivalent O(4), and two equivalent O(7) atoms to form distorted MnO6 octahedra that share corners with two equivalent Mn(2)O6 octahedra,  a cornercorner with one Mg(1)O4 tetrahedra, edges with two equivalent Mn(1)O6 octahedra, and edges with three equivalent Mn(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 8-16°. In the second Mn site, Mn(2) is bonded to one O(4), one O(6), two equivalent O(3), and two equivalent O(7) atoms to form distorted MnO6 octahedra that share corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Zn(1)O5 trigonal bipyramids, edges with two equivalent Mn(2)O6 octahedra, edges with three equivalent Mn(1)O6 octahedra, and edges with two equivalent Mg(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 8-16°. In the third Mn site, Mn(3) is bonded in a 5-coordinate geometry to one O(5), two equivalent O(1), and two equivalent O(8) atoms. In the fourth Mn site, Mn(4) is bonded in a 6-coordinate geometry to one O(1), one O(6), two equivalent O(2), and two equivalent O(8) atoms. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one O(8), two equivalent O(2), and two equivalent O(6) atoms to form distorted ZnO5 trigonal bipyramids that share corners with two equivalent Mn(2)O6 octahedra, corners with four equivalent Mg(1)O4 tetrahedra,  an edgeedge with one Mg(1)O4 tetrahedra, and edges with two equivalent Zn(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 62-66°. In the second Zn site, Zn(2) is bonded in a 5-coordinate geometry to one O(1), two equivalent O(4), and two equivalent O(5) atoms. There are eight inequivalent O sites. In the first O site, O(1) is bonded to one Mn(4), two equivalent Mn(3), and one Zn(2) atom to form OMn3Zn tetrahedra that share corners with two equivalent O(4)Mn3Zn2 square pyramids, corners with two equivalent O(1)Mn3Zn tetrahedra, corners with four equivalent O(5)Mn2Zn2 tetrahedra, corners with two equivalent O(2)MgMn2Zn2 trigonal bipyramids, corners with four equivalent O(8)Mn4Zn trigonal bipyramids, and  an edgeedge with one O(8)Mn4Zn trigonal bipyramid. In the second O site, O(2) is bonded to one Mg(1), two equivalent Mn(4), and two equivalent Zn(1) atoms to form distorted OMgMn2Zn2 trigonal bipyramids that share corners with two equivalent O(1)Mn3Zn tetrahedra, corners with four equivalent O(8)Mn4Zn trigonal bipyramids,  a cornercorner with one O(3)MgMn3 trigonal pyramid,  an edgeedge with one O(8)Mn4Zn trigonal bipyramid, and edges with two equivalent O(2)MgMn2Zn2 trigonal bipyramids. In the third O site, O(3) is bonded to one Mg(1), one Mn(1), and two equivalent Mn(2) atoms to form OMgMn3 trigonal pyramids that share  a cornercorner with one O(5)Mn2Zn2 tetrahedra,  a cornercorner with one O(2)MgMn2Zn2 trigonal bipyramid, corners with two equivalent O(3)MgMn3 trigonal pyramids, and edges with two equivalent O(4)Mn3Zn2 square pyramids. In the fourth O site, O(4) is bonded to one Mn(2), two equivalent Mn(1), and two equivalent Zn(2) atoms to form distorted OMn3Zn2 square pyramids that share corners with two equivalent O(1)Mn3Zn tetrahedra, corners with four equivalent O(5)Mn2Zn2 tetrahedra, edges with two equivalent O(4)Mn3Zn2 square pyramids,  an edgeedge with one O(5)Mn2Zn2 tetrahedra, and edges with two equivalent O(3)MgMn3 trigonal pyramids. In the fifth O site, O(5) is bonded to one Mn(1), one Mn(3), and two equivalent Zn(2) atoms to form OMn2Zn2 tetrahedra that share corners with four equivalent O(4)Mn3Zn2 square pyramids, corners with two equivalent O(5)Mn2Zn2 tetrahedra, corners with four equivalent O(1)Mn3Zn tetrahedra, corners with two equivalent O(8)Mn4Zn trigonal bipyramids,  a cornercorner with one O(3)MgMn3 trigonal pyramid, and  an edgeedge with one O(4)Mn3Zn2 square pyramid. In the sixth O site, O(6) is bonded in a 6-coordinate geometry to two equivalent Mg(1), one Mn(2), one Mn(4), and two equivalent Zn(1) atoms. In the seventh O site, O(7) is bonded in a distorted square co-planar geometry to two equivalent Mn(1) and two equivalent Mn(2) atoms. In the eighth O site, O(8) is bonded to two equivalent Mn(3), two equivalent Mn(4), and one Zn(1) atom to form distorted OMn4Zn trigonal bipyramids that share corners with two equivalent O(5)Mn2Zn2 tetrahedra, corners with four equivalent O(1)Mn3Zn tetrahedra, corners with four equivalent O(2)MgMn2Zn2 trigonal bipyramids,  an edgeedge with one O(1)Mn3Zn tetrahedra,  an edgeedge with one O(2)MgMn2Zn2 trigonal bipyramid, and edges with two equivalent O(8)Mn4Zn trigonal bipyramids.
MgMn4Zn2O8 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(2), one O(3), and two equivalent O(6) atoms to form MgO4 tetrahedra that share  a cornercorner with one Mn(1)O6 octahedra, corners with two equivalent Mg(1)O4 tetrahedra, corners with four equivalent Zn(1)O5 trigonal bipyramids, edges with two equivalent Mn(2)O6 octahedra, and  an edgeedge with one Zn(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 34°. The Mg(1)-O(2) bond length is 1.96 Å. The Mg(1)-O(3) bond length is 1.95 Å. Both Mg(1)-O(6) bond lengths are 1.96 Å. There are four inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(3), one O(5), two equivalent O(4), and two equivalent O(7) atoms to form distorted MnO6 octahedra that share corners with two equivalent Mn(2)O6 octahedra,  a cornercorner with one Mg(1)O4 tetrahedra, edges with two equivalent Mn(1)O6 octahedra, and edges with three equivalent Mn(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 8-16°. The Mn(1)-O(3) bond length is 2.01 Å. The Mn(1)-O(5) bond length is 1.96 Å. There is one shorter (1.96 Å) and one longer (2.28 Å) Mn(1)-O(4) bond length. There is one shorter (2.01 Å) and one longer (2.49 Å) Mn(1)-O(7) bond length. In the second Mn site, Mn(2) is bonded to one O(4), one O(6), two equivalent O(3), and two equivalent O(7) atoms to form distorted MnO6 octahedra that share corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Zn(1)O5 trigonal bipyramids, edges with two equivalent Mn(2)O6 octahedra, edges with three equivalent Mn(1)O6 octahedra, and edges with two equivalent Mg(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 8-16°. The Mn(2)-O(4) bond length is 2.21 Å. The Mn(2)-O(6) bond length is 2.70 Å. There is one shorter (2.04 Å) and one longer (2.06 Å) Mn(2)-O(3) bond length. There is one shorter (2.02 Å) and one longer (2.06 Å) Mn(2)-O(7) bond length. In the third Mn site, Mn(3) is bonded in a 5-coordinate geometry to one O(5), two equivalent O(1), and two equivalent O(8) atoms. The Mn(3)-O(5) bond length is 2.17 Å. There is one shorter (2.06 Å) and one longer (2.09 Å) Mn(3)-O(1) bond length. There is one shorter (2.23 Å) and one longer (2.26 Å) Mn(3)-O(8) bond length. In the fourth Mn site, Mn(4) is bonded in a 6-coordinate geometry to one O(1), one O(6), two equivalent O(2), and two equivalent O(8) atoms. The Mn(4)-O(1) bond length is 2.07 Å. The Mn(4)-O(6) bond length is 2.68 Å. There is one shorter (2.20 Å) and one longer (2.39 Å) Mn(4)-O(2) bond length. There is one shorter (2.12 Å) and one longer (2.19 Å) Mn(4)-O(8) bond length. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one O(8), two equivalent O(2), and two equivalent O(6) atoms to form distorted ZnO5 trigonal bipyramids that share corners with two equivalent Mn(2)O6 octahedra, corners with four equivalent Mg(1)O4 tetrahedra,  an edgeedge with one Mg(1)O4 tetrahedra, and edges with two equivalent Zn(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 62-66°. The Zn(1)-O(8) bond length is 2.05 Å. There is one shorter (2.03 Å) and one longer (2.14 Å) Zn(1)-O(2) bond length. There is one shorter (2.02 Å) and one longer (2.42 Å) Zn(1)-O(6) bond length. In the second Zn site, Zn(2) is bonded in a 5-coordinate geometry to one O(1), two equivalent O(4), and two equivalent O(5) atoms. The Zn(2)-O(1) bond length is 2.00 Å. There is one shorter (2.18 Å) and one longer (2.31 Å) Zn(2)-O(4) bond length. There is one shorter (2.06 Å) and one longer (2.09 Å) Zn(2)-O(5) bond length. There are eight inequivalent O sites. In the first O site, O(1) is bonded to one Mn(4), two equivalent Mn(3), and one Zn(2) atom to form OMn3Zn tetrahedra that share corners with two equivalent O(4)Mn3Zn2 square pyramids, corners with two equivalent O(1)Mn3Zn tetrahedra, corners with four equivalent O(5)Mn2Zn2 tetrahedra, corners with two equivalent O(2)MgMn2Zn2 trigonal bipyramids, corners with four equivalent O(8)Mn4Zn trigonal bipyramids, and  an edgeedge with one O(8)Mn4Zn trigonal bipyramid. In the second O site, O(2) is bonded to one Mg(1), two equivalent Mn(4), and two equivalent Zn(1) atoms to form distorted OMgMn2Zn2 trigonal bipyramids that share corners with two equivalent O(1)Mn3Zn tetrahedra, corners with four equivalent O(8)Mn4Zn trigonal bipyramids,  a cornercorner with one O(3)MgMn3 trigonal pyramid,  an edgeedge with one O(8)Mn4Zn trigonal bipyramid, and edges with two equivalent O(2)MgMn2Zn2 trigonal bipyramids. In the third O site, O(3) is bonded to one Mg(1), one Mn(1), and two equivalent Mn(2) atoms to form OMgMn3 trigonal pyramids that share  a cornercorner with one O(5)Mn2Zn2 tetrahedra,  a cornercorner with one O(2)MgMn2Zn2 trigonal bipyramid, corners with two equivalent O(3)MgMn3 trigonal pyramids, and edges with two equivalent O(4)Mn3Zn2 square pyramids. In the fourth O site, O(4) is bonded to one Mn(2), two equivalent Mn(1), and two equivalent Zn(2) atoms to form distorted OMn3Zn2 square pyramids that share corners with two equivalent O(1)Mn3Zn tetrahedra, corners with four equivalent O(5)Mn2Zn2 tetrahedra, edges with two equivalent O(4)Mn3Zn2 square pyramids,  an edgeedge with one O(5)Mn2Zn2 tetrahedra, and edges with two equivalent O(3)MgMn3 trigonal pyramids. In the fifth O site, O(5) is bonded to one Mn(1), one Mn(3), and two equivalent Zn(2) atoms to form OMn2Zn2 tetrahedra that share corners with four equivalent O(4)Mn3Zn2 square pyramids, corners with two equivalent O(5)Mn2Zn2 tetrahedra, corners with four equivalent O(1)Mn3Zn tetrahedra, corners with two equivalent O(8)Mn4Zn trigonal bipyramids,  a cornercorner with one O(3)MgMn3 trigonal pyramid, and  an edgeedge with one O(4)Mn3Zn2 square pyramid. In the sixth O site, O(6) is bonded in a 6-coordinate geometry to two equivalent Mg(1), one Mn(2), one Mn(4), and two equivalent Zn(1) atoms. In the seventh O site, O(7) is bonded in a distorted square co-planar geometry to two equivalent Mn(1) and two equivalent Mn(2) atoms. In the eighth O site, O(8) is bonded to two equivalent Mn(3), two equivalent Mn(4), and one Zn(1) atom to form distorted OMn4Zn trigonal bipyramids that share corners with two equivalent O(5)Mn2Zn2 tetrahedra, corners with four equivalent O(1)Mn3Zn tetrahedra, corners with four equivalent O(2)MgMn2Zn2 trigonal bipyramids,  an edgeedge with one O(1)Mn3Zn tetrahedra,  an edgeedge with one O(2)MgMn2Zn2 trigonal bipyramid, and edges with two equivalent O(8)Mn4Zn trigonal bipyramids.