Mg2Cr2O5 is Aluminum carbonitride-like structured and crystallizes in the orthorhombic Pbam space group. Mg(1) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. Cr(1) is bonded to one O(1), two equivalent O(2), and two equivalent O(3) atoms to form corner-sharing CrO5 trigonal bipyramids. There are three inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Mg(1) and two equivalent Cr(1) atoms to form distorted OMg4Cr2 octahedra that share corners with eight equivalent O(2)Mg2Cr2 tetrahedra, corners with four equivalent O(3)Mg2Cr2 trigonal pyramids, edges with two equivalent O(1)Mg4Cr2 octahedra, edges with two equivalent O(2)Mg2Cr2 tetrahedra, and edges with four equivalent O(3)Mg2Cr2 trigonal pyramids. In the second O site, O(2) is bonded to two equivalent Mg(1) and two equivalent Cr(1) atoms to form OMg2Cr2 tetrahedra that share corners with four equivalent O(1)Mg4Cr2 octahedra, corners with four equivalent O(2)Mg2Cr2 tetrahedra, corners with four equivalent O(3)Mg2Cr2 trigonal pyramids,  an edgeedge with one O(1)Mg4Cr2 octahedra, and edges with two equivalent O(3)Mg2Cr2 trigonal pyramids. The corner-sharing octahedral tilt angles range from 18-60°. In the third O site, O(3) is bonded to two equivalent Mg(1) and two equivalent Cr(1) atoms to form distorted OMg2Cr2 trigonal pyramids that share corners with two equivalent O(1)Mg4Cr2 octahedra, corners with four equivalent O(2)Mg2Cr2 tetrahedra, corners with two equivalent O(3)Mg2Cr2 trigonal pyramids, edges with two equivalent O(1)Mg4Cr2 octahedra, edges with two equivalent O(2)Mg2Cr2 tetrahedra, and  an edgeedge with one O(3)Mg2Cr2 trigonal pyramid. The corner-sharing octahedral tilt angles are 58°.
Mg2Cr2O5 is Aluminum carbonitride-like structured and crystallizes in the orthorhombic Pbam space group. Mg(1) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. Both Mg(1)-O(1) bond lengths are 2.50 Å. Both Mg(1)-O(2) bond lengths are 2.17 Å. There is one shorter (2.08 Å) and one longer (2.18 Å) Mg(1)-O(3) bond length. Cr(1) is bonded to one O(1), two equivalent O(2), and two equivalent O(3) atoms to form corner-sharing CrO5 trigonal bipyramids. The Cr(1)-O(1) bond length is 1.98 Å. There is one shorter (1.93 Å) and one longer (2.00 Å) Cr(1)-O(2) bond length. Both Cr(1)-O(3) bond lengths are 1.94 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Mg(1) and two equivalent Cr(1) atoms to form distorted OMg4Cr2 octahedra that share corners with eight equivalent O(2)Mg2Cr2 tetrahedra, corners with four equivalent O(3)Mg2Cr2 trigonal pyramids, edges with two equivalent O(1)Mg4Cr2 octahedra, edges with two equivalent O(2)Mg2Cr2 tetrahedra, and edges with four equivalent O(3)Mg2Cr2 trigonal pyramids. In the second O site, O(2) is bonded to two equivalent Mg(1) and two equivalent Cr(1) atoms to form OMg2Cr2 tetrahedra that share corners with four equivalent O(1)Mg4Cr2 octahedra, corners with four equivalent O(2)Mg2Cr2 tetrahedra, corners with four equivalent O(3)Mg2Cr2 trigonal pyramids,  an edgeedge with one O(1)Mg4Cr2 octahedra, and edges with two equivalent O(3)Mg2Cr2 trigonal pyramids. The corner-sharing octahedral tilt angles range from 18-60°. In the third O site, O(3) is bonded to two equivalent Mg(1) and two equivalent Cr(1) atoms to form distorted OMg2Cr2 trigonal pyramids that share corners with two equivalent O(1)Mg4Cr2 octahedra, corners with four equivalent O(2)Mg2Cr2 tetrahedra, corners with two equivalent O(3)Mg2Cr2 trigonal pyramids, edges with two equivalent O(1)Mg4Cr2 octahedra, edges with two equivalent O(2)Mg2Cr2 tetrahedra, and  an edgeedge with one O(3)Mg2Cr2 trigonal pyramid. The corner-sharing octahedral tilt angles are 58°.