MgMn4Zn2O8 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(5), one O(8), and two equivalent O(1) atoms to form MgO4 tetrahedra that share  a cornercorner with one Mn(2)O5 square pyramid, corners with two equivalent Mn(3)O5 square pyramids, corners with two equivalent Mg(1)O4 tetrahedra, and corners with two equivalent Zn(2)O4 tetrahedra. There are four inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(5), and two equivalent O(4) atoms. In the second Mn site, Mn(2) is bonded to one O(8), two equivalent O(3), and two equivalent O(6) atoms to form MnO5 square pyramids that share  a cornercorner with one Mg(1)O4 tetrahedra, corners with two equivalent Zn(2)O4 tetrahedra, edges with two equivalent Mn(2)O5 square pyramids, and edges with two equivalent Mn(3)O5 square pyramids. In the third Mn site, Mn(3) is bonded to one O(6), two equivalent O(2), and two equivalent O(8) atoms to form distorted MnO5 square pyramids that share corners with two equivalent Mg(1)O4 tetrahedra, edges with two equivalent Mn(2)O5 square pyramids, and edges with two equivalent Mn(3)O5 square pyramids. In the fourth Mn site, Mn(4) is bonded in a 6-coordinate geometry to one O(3), one O(4), two equivalent O(1), and two equivalent O(7) atoms. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded in a rectangular see-saw-like geometry to one O(4), one O(6), and two equivalent O(7) atoms. In the second Zn site, Zn(2) is bonded to one O(3), one O(7), and two equivalent O(5) atoms to form distorted ZnO4 tetrahedra that share corners with two equivalent Mn(2)O5 square pyramids, corners with two equivalent Mg(1)O4 tetrahedra, and corners with two equivalent Zn(2)O4 tetrahedra. There are eight inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Mg(1), one Mn(1), and two equivalent Mn(4) atoms to form distorted OMg2Mn3 square pyramids that share corners with two equivalent O(3)Mn3Zn tetrahedra, edges with two equivalent O(1)Mg2Mn3 square pyramids, and edges with two equivalent O(4)Mn3Zn trigonal pyramids. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to one Mn(1) and two equivalent Mn(3) atoms. In the third O site, O(3) is bonded to one Mn(4), two equivalent Mn(2), and one Zn(2) atom to form distorted OMn3Zn tetrahedra that share corners with two equivalent O(1)Mg2Mn3 square pyramids, corners with two equivalent O(3)Mn3Zn tetrahedra, and  a cornercorner with one O(4)Mn3Zn trigonal pyramid. In the fourth O site, O(4) is bonded to one Mn(4), two equivalent Mn(1), and one Zn(1) atom to form distorted OMn3Zn trigonal pyramids that share  a cornercorner with one O(3)Mn3Zn tetrahedra, corners with two equivalent O(4)Mn3Zn trigonal pyramids, and edges with two equivalent O(1)Mg2Mn3 square pyramids. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Mg(1), one Mn(1), and two equivalent Zn(2) atoms. In the sixth O site, O(6) is bonded in a rectangular see-saw-like geometry to one Mn(3), two equivalent Mn(2), and one Zn(1) atom. In the seventh O site, O(7) is bonded in a 5-coordinate geometry to two equivalent Mn(4), one Zn(2), and two equivalent Zn(1) atoms. In the eighth O site, O(8) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Mn(2), and two equivalent Mn(3) atoms.
MgMn4Zn2O8 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(5), one O(8), and two equivalent O(1) atoms to form MgO4 tetrahedra that share  a cornercorner with one Mn(2)O5 square pyramid, corners with two equivalent Mn(3)O5 square pyramids, corners with two equivalent Mg(1)O4 tetrahedra, and corners with two equivalent Zn(2)O4 tetrahedra. The Mg(1)-O(5) bond length is 1.99 Å. The Mg(1)-O(8) bond length is 1.96 Å. There is one shorter (1.98 Å) and one longer (1.99 Å) Mg(1)-O(1) bond length. There are four inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(5), and two equivalent O(4) atoms. The Mn(1)-O(1) bond length is 2.67 Å. The Mn(1)-O(2) bond length is 2.03 Å. The Mn(1)-O(5) bond length is 2.13 Å. There is one shorter (1.97 Å) and one longer (2.00 Å) Mn(1)-O(4) bond length. In the second Mn site, Mn(2) is bonded to one O(8), two equivalent O(3), and two equivalent O(6) atoms to form MnO5 square pyramids that share  a cornercorner with one Mg(1)O4 tetrahedra, corners with two equivalent Zn(2)O4 tetrahedra, edges with two equivalent Mn(2)O5 square pyramids, and edges with two equivalent Mn(3)O5 square pyramids. The Mn(2)-O(8) bond length is 2.24 Å. There is one shorter (2.01 Å) and one longer (2.03 Å) Mn(2)-O(3) bond length. There is one shorter (2.02 Å) and one longer (2.05 Å) Mn(2)-O(6) bond length. In the third Mn site, Mn(3) is bonded to one O(6), two equivalent O(2), and two equivalent O(8) atoms to form distorted MnO5 square pyramids that share corners with two equivalent Mg(1)O4 tetrahedra, edges with two equivalent Mn(2)O5 square pyramids, and edges with two equivalent Mn(3)O5 square pyramids. The Mn(3)-O(6) bond length is 2.26 Å. There is one shorter (1.96 Å) and one longer (1.98 Å) Mn(3)-O(2) bond length. There is one shorter (2.01 Å) and one longer (2.03 Å) Mn(3)-O(8) bond length. In the fourth Mn site, Mn(4) is bonded in a 6-coordinate geometry to one O(3), one O(4), two equivalent O(1), and two equivalent O(7) atoms. The Mn(4)-O(3) bond length is 2.17 Å. The Mn(4)-O(4) bond length is 2.40 Å. There is one shorter (2.14 Å) and one longer (2.19 Å) Mn(4)-O(1) bond length. There is one shorter (2.17 Å) and one longer (2.62 Å) Mn(4)-O(7) bond length. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded in a rectangular see-saw-like geometry to one O(4), one O(6), and two equivalent O(7) atoms. The Zn(1)-O(4) bond length is 1.98 Å. The Zn(1)-O(6) bond length is 1.93 Å. There is one shorter (2.03 Å) and one longer (2.07 Å) Zn(1)-O(7) bond length. In the second Zn site, Zn(2) is bonded to one O(3), one O(7), and two equivalent O(5) atoms to form distorted ZnO4 tetrahedra that share corners with two equivalent Mn(2)O5 square pyramids, corners with two equivalent Mg(1)O4 tetrahedra, and corners with two equivalent Zn(2)O4 tetrahedra. The Zn(2)-O(3) bond length is 2.16 Å. The Zn(2)-O(7) bond length is 1.95 Å. There is one shorter (1.99 Å) and one longer (2.00 Å) Zn(2)-O(5) bond length. There are eight inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Mg(1), one Mn(1), and two equivalent Mn(4) atoms to form distorted OMg2Mn3 square pyramids that share corners with two equivalent O(3)Mn3Zn tetrahedra, edges with two equivalent O(1)Mg2Mn3 square pyramids, and edges with two equivalent O(4)Mn3Zn trigonal pyramids. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to one Mn(1) and two equivalent Mn(3) atoms. In the third O site, O(3) is bonded to one Mn(4), two equivalent Mn(2), and one Zn(2) atom to form distorted OMn3Zn tetrahedra that share corners with two equivalent O(1)Mg2Mn3 square pyramids, corners with two equivalent O(3)Mn3Zn tetrahedra, and  a cornercorner with one O(4)Mn3Zn trigonal pyramid. In the fourth O site, O(4) is bonded to one Mn(4), two equivalent Mn(1), and one Zn(1) atom to form distorted OMn3Zn trigonal pyramids that share  a cornercorner with one O(3)Mn3Zn tetrahedra, corners with two equivalent O(4)Mn3Zn trigonal pyramids, and edges with two equivalent O(1)Mg2Mn3 square pyramids. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Mg(1), one Mn(1), and two equivalent Zn(2) atoms. In the sixth O site, O(6) is bonded in a rectangular see-saw-like geometry to one Mn(3), two equivalent Mn(2), and one Zn(1) atom. In the seventh O site, O(7) is bonded in a 5-coordinate geometry to two equivalent Mn(4), one Zn(2), and two equivalent Zn(1) atoms. In the eighth O site, O(8) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Mn(2), and two equivalent Mn(3) atoms.