MgZn2(FeO2)4 crystallizes in the orthorhombic Imm2 space group. Mg(1) is bonded in a 4-coordinate geometry to two equivalent O(3) and two equivalent O(4) atoms. There are three inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a tetrahedral geometry to two equivalent O(3) and two equivalent O(4) atoms. In the second Fe site, Fe(2) is bonded in a tetrahedral geometry to two equivalent O(1) and two equivalent O(2) atoms. In the third Fe site, Fe(3) is bonded in a 5-coordinate geometry to one O(1), two equivalent O(2), and two equivalent O(3) atoms. Zn(1) is bonded in a 5-coordinate geometry to one O(2), two equivalent O(1), and two equivalent O(4) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Fe(2), one Fe(3), and two equivalent Zn(1) atoms. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Fe(2), two equivalent Fe(3), and one Zn(1) atom. In the third O site, O(3) is bonded to one Mg(1), one Fe(1), and two equivalent Fe(3) atoms to form distorted OMgFe3 tetrahedra that share  a cornercorner with one O(3)MgFe3 tetrahedra, corners with four equivalent O(4)MgZn2Fe tetrahedra, and  a faceface with one O(3)MgFe3 tetrahedra. In the fourth O site, O(4) is bonded to one Mg(1), one Fe(1), and two equivalent Zn(1) atoms to form distorted OMgZn2Fe tetrahedra that share  a cornercorner with one O(4)MgZn2Fe tetrahedra, corners with four equivalent O(3)MgFe3 tetrahedra, and  a faceface with one O(4)MgZn2Fe tetrahedra.
MgZn2(FeO2)4 crystallizes in the orthorhombic Imm2 space group. Mg(1) is bonded in a 4-coordinate geometry to two equivalent O(3) and two equivalent O(4) atoms. Both Mg(1)-O(3) bond lengths are 2.04 Å. Both Mg(1)-O(4) bond lengths are 2.01 Å. There are three inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a tetrahedral geometry to two equivalent O(3) and two equivalent O(4) atoms. Both Fe(1)-O(3) bond lengths are 1.95 Å. Both Fe(1)-O(4) bond lengths are 1.97 Å. In the second Fe site, Fe(2) is bonded in a tetrahedral geometry to two equivalent O(1) and two equivalent O(2) atoms. Both Fe(2)-O(1) bond lengths are 1.97 Å. Both Fe(2)-O(2) bond lengths are 2.01 Å. In the third Fe site, Fe(3) is bonded in a 5-coordinate geometry to one O(1), two equivalent O(2), and two equivalent O(3) atoms. The Fe(3)-O(1) bond length is 2.14 Å. Both Fe(3)-O(2) bond lengths are 2.09 Å. Both Fe(3)-O(3) bond lengths are 2.11 Å. Zn(1) is bonded in a 5-coordinate geometry to one O(2), two equivalent O(1), and two equivalent O(4) atoms. The Zn(1)-O(2) bond length is 2.09 Å. Both Zn(1)-O(1) bond lengths are 2.14 Å. Both Zn(1)-O(4) bond lengths are 2.08 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Fe(2), one Fe(3), and two equivalent Zn(1) atoms. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Fe(2), two equivalent Fe(3), and one Zn(1) atom. In the third O site, O(3) is bonded to one Mg(1), one Fe(1), and two equivalent Fe(3) atoms to form distorted OMgFe3 tetrahedra that share  a cornercorner with one O(3)MgFe3 tetrahedra, corners with four equivalent O(4)MgZn2Fe tetrahedra, and  a faceface with one O(3)MgFe3 tetrahedra. In the fourth O site, O(4) is bonded to one Mg(1), one Fe(1), and two equivalent Zn(1) atoms to form distorted OMgZn2Fe tetrahedra that share  a cornercorner with one O(4)MgZn2Fe tetrahedra, corners with four equivalent O(3)MgFe3 tetrahedra, and  a faceface with one O(4)MgZn2Fe tetrahedra.