MgCr3InO8 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(2), one O(3), one O(4), and one O(5) atom to form distorted MgO4 tetrahedra that share corners with three equivalent Cr(3)O6 octahedra, corners with three equivalent In(1)O6 octahedra, corners with two equivalent Cr(1)O4 tetrahedra, and  an edgeedge with one Cr(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 62-69°. There are three inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one O(1), one O(2), one O(4), and one O(6) atom to form CrO4 tetrahedra that share corners with three equivalent Cr(3)O6 octahedra, corners with three equivalent In(1)O6 octahedra, and corners with two equivalent Mg(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 47-56°. In the second Cr site, Cr(2) is bonded to one O(3), one O(5), one O(7), and one O(8) atom to form CrO4 tetrahedra that share corners with three equivalent Cr(3)O6 octahedra, corners with three equivalent In(1)O6 octahedra, and  an edgeedge with one Mg(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 46-59°. In the third Cr site, Cr(3) is bonded to one O(1), one O(3), one O(4), one O(5), one O(6), and one O(7) atom to form CrO6 octahedra that share corners with three equivalent Mg(1)O4 tetrahedra, corners with three equivalent Cr(1)O4 tetrahedra, corners with three equivalent Cr(2)O4 tetrahedra, and edges with two equivalent In(1)O6 octahedra. In(1) is bonded to one O(1), one O(2), one O(3), one O(5), one O(6), and one O(8) atom to form InO6 octahedra that share corners with three equivalent Mg(1)O4 tetrahedra, corners with three equivalent Cr(1)O4 tetrahedra, corners with three equivalent Cr(2)O4 tetrahedra, and edges with two equivalent Cr(3)O6 octahedra. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Cr(1), one Cr(3), and one In(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Mg(1), one Cr(1), and one In(1) atom. In the third O site, O(3) is bonded to one Mg(1), one Cr(2), one Cr(3), and one In(1) atom to form distorted edge-sharing OMgCr2In tetrahedra. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Mg(1), one Cr(1), and one Cr(3) atom. In the fifth O site, O(5) is bonded to one Mg(1), one Cr(2), one Cr(3), and one In(1) atom to form distorted edge-sharing OMgCr2In tetrahedra. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Cr(1), one Cr(3), and one In(1) atom. In the seventh O site, O(7) is bonded in a distorted bent 120 degrees geometry to one Cr(2) and one Cr(3) atom. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to one Cr(2) and one In(1) atom.
MgCr3InO8 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(2), one O(3), one O(4), and one O(5) atom to form distorted MgO4 tetrahedra that share corners with three equivalent Cr(3)O6 octahedra, corners with three equivalent In(1)O6 octahedra, corners with two equivalent Cr(1)O4 tetrahedra, and  an edgeedge with one Cr(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 62-69°. The Mg(1)-O(2) bond length is 1.97 Å. The Mg(1)-O(3) bond length is 2.07 Å. The Mg(1)-O(4) bond length is 1.98 Å. The Mg(1)-O(5) bond length is 2.06 Å. There are three inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one O(1), one O(2), one O(4), and one O(6) atom to form CrO4 tetrahedra that share corners with three equivalent Cr(3)O6 octahedra, corners with three equivalent In(1)O6 octahedra, and corners with two equivalent Mg(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 47-56°. The Cr(1)-O(1) bond length is 1.81 Å. The Cr(1)-O(2) bond length is 1.82 Å. The Cr(1)-O(4) bond length is 1.82 Å. The Cr(1)-O(6) bond length is 1.81 Å. In the second Cr site, Cr(2) is bonded to one O(3), one O(5), one O(7), and one O(8) atom to form CrO4 tetrahedra that share corners with three equivalent Cr(3)O6 octahedra, corners with three equivalent In(1)O6 octahedra, and  an edgeedge with one Mg(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 46-59°. The Cr(2)-O(3) bond length is 1.92 Å. The Cr(2)-O(5) bond length is 1.92 Å. The Cr(2)-O(7) bond length is 1.71 Å. The Cr(2)-O(8) bond length is 1.72 Å. In the third Cr site, Cr(3) is bonded to one O(1), one O(3), one O(4), one O(5), one O(6), and one O(7) atom to form CrO6 octahedra that share corners with three equivalent Mg(1)O4 tetrahedra, corners with three equivalent Cr(1)O4 tetrahedra, corners with three equivalent Cr(2)O4 tetrahedra, and edges with two equivalent In(1)O6 octahedra. The Cr(3)-O(1) bond length is 2.03 Å. The Cr(3)-O(3) bond length is 2.11 Å. The Cr(3)-O(4) bond length is 2.03 Å. The Cr(3)-O(5) bond length is 2.10 Å. The Cr(3)-O(6) bond length is 2.03 Å. The Cr(3)-O(7) bond length is 1.95 Å. In(1) is bonded to one O(1), one O(2), one O(3), one O(5), one O(6), and one O(8) atom to form InO6 octahedra that share corners with three equivalent Mg(1)O4 tetrahedra, corners with three equivalent Cr(1)O4 tetrahedra, corners with three equivalent Cr(2)O4 tetrahedra, and edges with two equivalent Cr(3)O6 octahedra. The In(1)-O(1) bond length is 2.20 Å. The In(1)-O(2) bond length is 2.16 Å. The In(1)-O(3) bond length is 2.28 Å. The In(1)-O(5) bond length is 2.28 Å. The In(1)-O(6) bond length is 2.20 Å. The In(1)-O(8) bond length is 2.12 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Cr(1), one Cr(3), and one In(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Mg(1), one Cr(1), and one In(1) atom. In the third O site, O(3) is bonded to one Mg(1), one Cr(2), one Cr(3), and one In(1) atom to form distorted edge-sharing OMgCr2In tetrahedra. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Mg(1), one Cr(1), and one Cr(3) atom. In the fifth O site, O(5) is bonded to one Mg(1), one Cr(2), one Cr(3), and one In(1) atom to form distorted edge-sharing OMgCr2In tetrahedra. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Cr(1), one Cr(3), and one In(1) atom. In the seventh O site, O(7) is bonded in a distorted bent 120 degrees geometry to one Cr(2) and one Cr(3) atom. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to one Cr(2) and one In(1) atom.