MgZn2(FeO2)4 is Aluminum carbonitride-derived structured and crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 5-coordinate geometry to one O(4), two equivalent O(5), and two equivalent O(7) atoms. There are four inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 6-coordinate geometry to one O(1), one O(5), two equivalent O(2), and two equivalent O(4) atoms. In the second Fe site, Fe(2) is bonded in a 5-coordinate geometry to one O(4), one O(6), one O(8), and two equivalent O(3) atoms. In the third Fe site, Fe(3) is bonded to one O(1), one O(6), two equivalent O(2), and two equivalent O(8) atoms to form FeO6 octahedra that share corners with two equivalent Fe(4)O4 tetrahedra, corners with two equivalent Zn(2)O4 trigonal pyramids, and edges with two equivalent Fe(3)O6 octahedra. In the fourth Fe site, Fe(4) is bonded to one O(3), one O(7), and two equivalent O(1) atoms to form FeO4 tetrahedra that share corners with two equivalent Fe(3)O6 octahedra, corners with two equivalent Fe(4)O4 tetrahedra, and  a cornercorner with one Zn(2)O4 trigonal pyramid. The corner-sharing octahedral tilt angles range from 53-59°. 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(2), one O(7), and two equivalent O(6) atoms. In the second Zn site, Zn(2) is bonded to one O(3), one O(8), and two equivalent O(5) atoms to form distorted ZnO4 trigonal pyramids that share corners with two equivalent Fe(3)O6 octahedra,  a cornercorner with one Fe(4)O4 tetrahedra, and corners with two equivalent Zn(2)O4 trigonal pyramids. The corner-sharing octahedral tilt angles range from 29-76°. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Fe(1), one Fe(3), and two equivalent Fe(4) atoms. In the second O site, O(2) is bonded to two equivalent Fe(1), two equivalent Fe(3), and one Zn(1) atom to form distorted OZnFe4 trigonal bipyramids that share  a cornercorner with one O(7)Mg2ZnFe tetrahedra, corners with two equivalent O(8)ZnFe3 tetrahedra, corners with two equivalent O(5)Mg2Zn2Fe trigonal bipyramids,  an edgeedge with one O(8)ZnFe3 tetrahedra, edges with two equivalent O(2)ZnFe4 trigonal bipyramids, and edges with two equivalent O(6)Zn2Fe2 trigonal pyramids. In the third O site, O(3) is bonded in a rectangular see-saw-like geometry to one Fe(4), two equivalent Fe(2), and one Zn(2) atom. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Fe(2), and two equivalent Fe(1) atoms. In the fifth O site, O(5) is bonded to two equivalent Mg(1), one Fe(1), and two equivalent Zn(2) atoms to form distorted OMg2Zn2Fe trigonal bipyramids that share corners with two equivalent O(7)Mg2ZnFe tetrahedra, corners with two equivalent O(8)ZnFe3 tetrahedra, corners with two equivalent O(2)ZnFe4 trigonal bipyramids,  an edgeedge with one O(7)Mg2ZnFe tetrahedra, and edges with two equivalent O(5)Mg2Zn2Fe trigonal bipyramids. In the sixth O site, O(6) is bonded to one Fe(2), one Fe(3), and two equivalent Zn(1) atoms to form distorted OZn2Fe2 trigonal pyramids that share  a cornercorner with one O(8)ZnFe3 tetrahedra, corners with two equivalent O(7)Mg2ZnFe tetrahedra, corners with two equivalent O(6)Zn2Fe2 trigonal pyramids,  an edgeedge with one O(8)ZnFe3 tetrahedra, and edges with two equivalent O(2)ZnFe4 trigonal bipyramids. In the seventh O site, O(7) is bonded to two equivalent Mg(1), one Fe(4), and one Zn(1) atom to form OMg2ZnFe tetrahedra that share corners with two equivalent O(7)Mg2ZnFe tetrahedra,  a cornercorner with one O(2)ZnFe4 trigonal bipyramid, corners with two equivalent O(5)Mg2Zn2Fe trigonal bipyramids, corners with two equivalent O(6)Zn2Fe2 trigonal pyramids, and  an edgeedge with one O(5)Mg2Zn2Fe trigonal bipyramid. In the eighth O site, O(8) is bonded to one Fe(2), two equivalent Fe(3), and one Zn(2) atom to form distorted OZnFe3 tetrahedra that share corners with two equivalent O(8)ZnFe3 tetrahedra, corners with two equivalent O(5)Mg2Zn2Fe trigonal bipyramids, corners with two equivalent O(2)ZnFe4 trigonal bipyramids,  a cornercorner with one O(6)Zn2Fe2 trigonal pyramid,  an edgeedge with one O(2)ZnFe4 trigonal bipyramid, and  an edgeedge with one O(6)Zn2Fe2 trigonal pyramid.
MgZn2(FeO2)4 is Aluminum carbonitride-derived structured and crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 5-coordinate geometry to one O(4), two equivalent O(5), and two equivalent O(7) atoms. The Mg(1)-O(4) bond length is 2.01 Å. There is one shorter (2.12 Å) and one longer (2.43 Å) Mg(1)-O(5) bond length. There is one shorter (2.10 Å) and one longer (2.13 Å) Mg(1)-O(7) bond length. There are four inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 6-coordinate geometry to one O(1), one O(5), two equivalent O(2), and two equivalent O(4) atoms. The Fe(1)-O(1) bond length is 2.61 Å. The Fe(1)-O(5) bond length is 2.19 Å. There is one shorter (2.04 Å) and one longer (2.39 Å) Fe(1)-O(2) bond length. There is one shorter (1.99 Å) and one longer (2.15 Å) Fe(1)-O(4) bond length. In the second Fe site, Fe(2) is bonded in a 5-coordinate geometry to one O(4), one O(6), one O(8), and two equivalent O(3) atoms. The Fe(2)-O(4) bond length is 2.03 Å. The Fe(2)-O(6) bond length is 2.15 Å. The Fe(2)-O(8) bond length is 2.23 Å. Both Fe(2)-O(3) bond lengths are 2.24 Å. In the third Fe site, Fe(3) is bonded to one O(1), one O(6), two equivalent O(2), and two equivalent O(8) atoms to form FeO6 octahedra that share corners with two equivalent Fe(4)O4 tetrahedra, corners with two equivalent Zn(2)O4 trigonal pyramids, and edges with two equivalent Fe(3)O6 octahedra. The Fe(3)-O(1) bond length is 2.07 Å. The Fe(3)-O(6) bond length is 1.99 Å. There is one shorter (2.13 Å) and one longer (2.29 Å) Fe(3)-O(2) bond length. There is one shorter (1.98 Å) and one longer (2.03 Å) Fe(3)-O(8) bond length. In the fourth Fe site, Fe(4) is bonded to one O(3), one O(7), and two equivalent O(1) atoms to form FeO4 tetrahedra that share corners with two equivalent Fe(3)O6 octahedra, corners with two equivalent Fe(4)O4 tetrahedra, and  a cornercorner with one Zn(2)O4 trigonal pyramid. The corner-sharing octahedral tilt angles range from 53-59°. The Fe(4)-O(3) bond length is 1.90 Å. The Fe(4)-O(7) bond length is 1.93 Å. There is one shorter (1.91 Å) and one longer (1.94 Å) Fe(4)-O(1) 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(2), one O(7), and two equivalent O(6) atoms. The Zn(1)-O(2) bond length is 1.98 Å. The Zn(1)-O(7) bond length is 1.95 Å. There is one shorter (1.99 Å) and one longer (2.00 Å) Zn(1)-O(6) bond length. In the second Zn site, Zn(2) is bonded to one O(3), one O(8), and two equivalent O(5) atoms to form distorted ZnO4 trigonal pyramids that share corners with two equivalent Fe(3)O6 octahedra,  a cornercorner with one Fe(4)O4 tetrahedra, and corners with two equivalent Zn(2)O4 trigonal pyramids. The corner-sharing octahedral tilt angles range from 29-76°. The Zn(2)-O(3) bond length is 2.01 Å. The Zn(2)-O(8) bond length is 2.07 Å. There is one shorter (2.01 Å) and one longer (2.04 Å) Zn(2)-O(5) bond length. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Fe(1), one Fe(3), and two equivalent Fe(4) atoms. In the second O site, O(2) is bonded to two equivalent Fe(1), two equivalent Fe(3), and one Zn(1) atom to form distorted OZnFe4 trigonal bipyramids that share  a cornercorner with one O(7)Mg2ZnFe tetrahedra, corners with two equivalent O(8)ZnFe3 tetrahedra, corners with two equivalent O(5)Mg2Zn2Fe trigonal bipyramids,  an edgeedge with one O(8)ZnFe3 tetrahedra, edges with two equivalent O(2)ZnFe4 trigonal bipyramids, and edges with two equivalent O(6)Zn2Fe2 trigonal pyramids. In the third O site, O(3) is bonded in a rectangular see-saw-like geometry to one Fe(4), two equivalent Fe(2), and one Zn(2) atom. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Fe(2), and two equivalent Fe(1) atoms. In the fifth O site, O(5) is bonded to two equivalent Mg(1), one Fe(1), and two equivalent Zn(2) atoms to form distorted OMg2Zn2Fe trigonal bipyramids that share corners with two equivalent O(7)Mg2ZnFe tetrahedra, corners with two equivalent O(8)ZnFe3 tetrahedra, corners with two equivalent O(2)ZnFe4 trigonal bipyramids,  an edgeedge with one O(7)Mg2ZnFe tetrahedra, and edges with two equivalent O(5)Mg2Zn2Fe trigonal bipyramids. In the sixth O site, O(6) is bonded to one Fe(2), one Fe(3), and two equivalent Zn(1) atoms to form distorted OZn2Fe2 trigonal pyramids that share  a cornercorner with one O(8)ZnFe3 tetrahedra, corners with two equivalent O(7)Mg2ZnFe tetrahedra, corners with two equivalent O(6)Zn2Fe2 trigonal pyramids,  an edgeedge with one O(8)ZnFe3 tetrahedra, and edges with two equivalent O(2)ZnFe4 trigonal bipyramids. In the seventh O site, O(7) is bonded to two equivalent Mg(1), one Fe(4), and one Zn(1) atom to form OMg2ZnFe tetrahedra that share corners with two equivalent O(7)Mg2ZnFe tetrahedra,  a cornercorner with one O(2)ZnFe4 trigonal bipyramid, corners with two equivalent O(5)Mg2Zn2Fe trigonal bipyramids, corners with two equivalent O(6)Zn2Fe2 trigonal pyramids, and  an edgeedge with one O(5)Mg2Zn2Fe trigonal bipyramid. In the eighth O site, O(8) is bonded to one Fe(2), two equivalent Fe(3), and one Zn(2) atom to form distorted OZnFe3 tetrahedra that share corners with two equivalent O(8)ZnFe3 tetrahedra, corners with two equivalent O(5)Mg2Zn2Fe trigonal bipyramids, corners with two equivalent O(2)ZnFe4 trigonal bipyramids,  a cornercorner with one O(6)Zn2Fe2 trigonal pyramid,  an edgeedge with one O(2)ZnFe4 trigonal bipyramid, and  an edgeedge with one O(6)Zn2Fe2 trigonal pyramid.