MgCrSbO4 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(1), one O(3), and two equivalent O(2) atoms to form distorted MgO4 trigonal pyramids that share corners with three equivalent Cr(1)O6 octahedra, corners with six equivalent Sb(1)O6 octahedra, corners with two equivalent Mg(1)O4 trigonal pyramids, and  a faceface with one Cr(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 34-61°. Cr(1) is bonded to one O(1), one O(3), two equivalent O(2), and two equivalent O(4) atoms to form distorted CrO6 octahedra that share corners with three equivalent Mg(1)O4 trigonal pyramids, edges with two equivalent Cr(1)O6 octahedra, edges with four equivalent Sb(1)O6 octahedra, and  a faceface with one Mg(1)O4 trigonal pyramid. Sb(1) is bonded to one O(2), one O(4), two equivalent O(1), and two equivalent O(3) atoms to form distorted SbO6 octahedra that share corners with six equivalent Mg(1)O4 trigonal pyramids, edges with two equivalent Sb(1)O6 octahedra, and edges with four equivalent Cr(1)O6 octahedra. There are four 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), and two equivalent Sb(1) atoms. In the second O site, O(2) is bonded in a 5-coordinate geometry to two equivalent Mg(1), two equivalent Cr(1), and one Sb(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Mg(1), one Cr(1), and two equivalent Sb(1) atoms. In the fourth O site, O(4) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Cr(1) and one Sb(1) atom.
MgCrSbO4 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(1), one O(3), and two equivalent O(2) atoms to form distorted MgO4 trigonal pyramids that share corners with three equivalent Cr(1)O6 octahedra, corners with six equivalent Sb(1)O6 octahedra, corners with two equivalent Mg(1)O4 trigonal pyramids, and  a faceface with one Cr(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 34-61°. The Mg(1)-O(1) bond length is 2.05 Å. The Mg(1)-O(3) bond length is 1.92 Å. There is one shorter (2.06 Å) and one longer (2.07 Å) Mg(1)-O(2) bond length. Cr(1) is bonded to one O(1), one O(3), two equivalent O(2), and two equivalent O(4) atoms to form distorted CrO6 octahedra that share corners with three equivalent Mg(1)O4 trigonal pyramids, edges with two equivalent Cr(1)O6 octahedra, edges with four equivalent Sb(1)O6 octahedra, and  a faceface with one Mg(1)O4 trigonal pyramid. The Cr(1)-O(1) bond length is 2.04 Å. The Cr(1)-O(3) bond length is 2.03 Å. There is one shorter (2.22 Å) and one longer (2.23 Å) Cr(1)-O(2) bond length. Both Cr(1)-O(4) bond lengths are 2.03 Å. Sb(1) is bonded to one O(2), one O(4), two equivalent O(1), and two equivalent O(3) atoms to form distorted SbO6 octahedra that share corners with six equivalent Mg(1)O4 trigonal pyramids, edges with two equivalent Sb(1)O6 octahedra, and edges with four equivalent Cr(1)O6 octahedra. The Sb(1)-O(2) bond length is 2.62 Å. The Sb(1)-O(4) bond length is 2.15 Å. Both Sb(1)-O(1) bond lengths are 2.20 Å. Both Sb(1)-O(3) bond lengths are 2.42 Å. There are four 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), and two equivalent Sb(1) atoms. In the second O site, O(2) is bonded in a 5-coordinate geometry to two equivalent Mg(1), two equivalent Cr(1), and one Sb(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Mg(1), one Cr(1), and two equivalent Sb(1) atoms. In the fourth O site, O(4) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Cr(1) and one Sb(1) atom.