MgCr2Zn2O8 crystallizes in the monoclinic C2/m space group. Mg(1) is bonded in a 6-coordinate geometry to two equivalent O(2) and four equivalent O(1) atoms. Cr(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form distorted CrO4 trigonal pyramids that share corners with three equivalent Zn(1)O6 octahedra and corners with three equivalent Zn(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 43-65°. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to two equivalent O(3) and four equivalent O(1) atoms to form ZnO6 octahedra that share corners with six equivalent Cr(1)O4 trigonal pyramids and edges with two equivalent Zn(2)O6 octahedra. In the second Zn site, Zn(2) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form ZnO6 octahedra that share corners with six equivalent Cr(1)O4 trigonal pyramids and edges with two equivalent Zn(1)O6 octahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Cr(1), one Zn(1), and one Zn(2) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Mg(1), one Cr(1), and one Zn(2) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Cr(1) and one Zn(1) atom.
MgCr2Zn2O8 crystallizes in the monoclinic C2/m space group. Mg(1) is bonded in a 6-coordinate geometry to two equivalent O(2) and four equivalent O(1) atoms. Both Mg(1)-O(2) bond lengths are 2.44 Å. All Mg(1)-O(1) bond lengths are 2.08 Å. Cr(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form distorted CrO4 trigonal pyramids that share corners with three equivalent Zn(1)O6 octahedra and corners with three equivalent Zn(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 43-65°. The Cr(1)-O(2) bond length is 1.67 Å. The Cr(1)-O(3) bond length is 1.65 Å. Both Cr(1)-O(1) bond lengths are 1.85 Å. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to two equivalent O(3) and four equivalent O(1) atoms to form ZnO6 octahedra that share corners with six equivalent Cr(1)O4 trigonal pyramids and edges with two equivalent Zn(2)O6 octahedra. Both Zn(1)-O(3) bond lengths are 2.12 Å. All Zn(1)-O(1) bond lengths are 2.20 Å. In the second Zn site, Zn(2) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form ZnO6 octahedra that share corners with six equivalent Cr(1)O4 trigonal pyramids and edges with two equivalent Zn(1)O6 octahedra. Both Zn(2)-O(2) bond lengths are 2.06 Å. All Zn(2)-O(1) bond lengths are 2.19 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Cr(1), one Zn(1), and one Zn(2) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Mg(1), one Cr(1), and one Zn(2) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Cr(1) and one Zn(1) atom.