MgLa4Cr2O12 crystallizes in the monoclinic C2 space group. Mg(1) is bonded in a 4-coordinate geometry to two equivalent O(3) and two equivalent O(6) atoms. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 9-coordinate geometry to one O(1), one O(2), one O(4), one O(6), two equivalent O(3), and three equivalent O(5) atoms. In the second La site, La(2) is bonded in a 9-coordinate geometry to one O(2), one O(3), one O(5), one O(6), two equivalent O(4), and three equivalent O(1) atoms. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded in a tetrahedral geometry to two equivalent O(3) and two equivalent O(6) atoms. In the second Cr site, Cr(2) is bonded in a tetrahedral geometry to two equivalent O(2) and two equivalent O(4) atoms. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one La(1) and three equivalent La(2) atoms. In the second O site, O(2) is bonded in a distorted single-bond geometry to one La(1), one La(2), and one Cr(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Mg(1), one La(2), two equivalent La(1), and one Cr(1) atom. In the fourth O site, O(4) is bonded in a single-bond geometry to one La(1), two equivalent La(2), and one Cr(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one La(2) and three equivalent La(1) atoms. In the sixth O site, O(6) is bonded to one Mg(1), one La(1), one La(2), and one Cr(1) atom to form distorted edge-sharing OLa2MgCr trigonal pyramids.
MgLa4Cr2O12 crystallizes in the monoclinic C2 space group. Mg(1) is bonded in a 4-coordinate geometry to two equivalent O(3) and two equivalent O(6) atoms. Both Mg(1)-O(3) bond lengths are 1.95 Å. Both Mg(1)-O(6) bond lengths are 1.97 Å. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 9-coordinate geometry to one O(1), one O(2), one O(4), one O(6), two equivalent O(3), and three equivalent O(5) atoms. The La(1)-O(1) bond length is 2.34 Å. The La(1)-O(2) bond length is 2.88 Å. The La(1)-O(4) bond length is 3.00 Å. The La(1)-O(6) bond length is 2.65 Å. There is one shorter (2.54 Å) and one longer (3.25 Å) La(1)-O(3) bond length. There are a spread of La(1)-O(5) bond distances ranging from 2.33-3.18 Å. In the second La site, La(2) is bonded in a 9-coordinate geometry to one O(2), one O(3), one O(5), one O(6), two equivalent O(4), and three equivalent O(1) atoms. The La(2)-O(2) bond length is 2.75 Å. The La(2)-O(3) bond length is 3.23 Å. The La(2)-O(5) bond length is 2.44 Å. The La(2)-O(6) bond length is 2.55 Å. There is one shorter (2.80 Å) and one longer (2.90 Å) La(2)-O(4) bond length. There are a spread of La(2)-O(1) bond distances ranging from 2.29-3.23 Å. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded in a tetrahedral geometry to two equivalent O(3) and two equivalent O(6) atoms. Both Cr(1)-O(3) bond lengths are 1.79 Å. Both Cr(1)-O(6) bond lengths are 1.83 Å. In the second Cr site, Cr(2) is bonded in a tetrahedral geometry to two equivalent O(2) and two equivalent O(4) atoms. Both Cr(2)-O(2) bond lengths are 1.68 Å. Both Cr(2)-O(4) bond lengths are 1.67 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one La(1) and three equivalent La(2) atoms. In the second O site, O(2) is bonded in a distorted single-bond geometry to one La(1), one La(2), and one Cr(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Mg(1), one La(2), two equivalent La(1), and one Cr(1) atom. In the fourth O site, O(4) is bonded in a single-bond geometry to one La(1), two equivalent La(2), and one Cr(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one La(2) and three equivalent La(1) atoms. In the sixth O site, O(6) is bonded to one Mg(1), one La(1), one La(2), and one Cr(1) atom to form distorted edge-sharing OLa2MgCr trigonal pyramids.