MgLa2(FeO3)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(3) atom. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom. In the second La site, La(2) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in an octahedral geometry to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom. In the second Fe site, Fe(2) is bonded in a trigonal planar geometry to one O(4), one O(5), and one O(6) atom. There are six inequivalent O sites. In the first O site, O(1) is bonded to one Mg(1), one La(1), one La(2), and one Fe(1) atom to form distorted OLa2MgFe trigonal pyramids that share  a cornercorner with one O(6)La2Fe2 trigonal pyramid, corners with two equivalent O(2)La2MgFe trigonal pyramids, corners with two equivalent O(3)La2MgFe trigonal pyramids, corners with three equivalent O(4)La2Fe2 trigonal pyramids, corners with three equivalent O(5)La2Fe2 trigonal pyramids,  an edgeedge with one O(6)La2Fe2 trigonal pyramid,  an edgeedge with one O(2)La2MgFe trigonal pyramid, and  an edgeedge with one O(3)La2MgFe trigonal pyramid. In the second O site, O(2) is bonded to one Mg(1), one La(1), one La(2), and one Fe(1) atom to form distorted OLa2MgFe trigonal pyramids that share  a cornercorner with one O(4)La2Fe2 trigonal pyramid, corners with two equivalent O(1)La2MgFe trigonal pyramids, corners with two equivalent O(3)La2MgFe trigonal pyramids, corners with three equivalent O(5)La2Fe2 trigonal pyramids, corners with three equivalent O(6)La2Fe2 trigonal pyramids,  an edgeedge with one O(4)La2Fe2 trigonal pyramid,  an edgeedge with one O(1)La2MgFe trigonal pyramid, and  an edgeedge with one O(3)La2MgFe trigonal pyramid. In the third O site, O(3) is bonded to one Mg(1), one La(1), one La(2), and one Fe(1) atom to form distorted OLa2MgFe trigonal pyramids that share  a cornercorner with one O(5)La2Fe2 trigonal pyramid, corners with two equivalent O(1)La2MgFe trigonal pyramids, corners with two equivalent O(2)La2MgFe trigonal pyramids, corners with three equivalent O(4)La2Fe2 trigonal pyramids, corners with three equivalent O(6)La2Fe2 trigonal pyramids,  an edgeedge with one O(5)La2Fe2 trigonal pyramid,  an edgeedge with one O(1)La2MgFe trigonal pyramid, and  an edgeedge with one O(2)La2MgFe trigonal pyramid. In the fourth O site, O(4) is bonded to one La(1), one La(2), one Fe(1), and one Fe(2) atom to form distorted OLa2Fe2 trigonal pyramids that share  a cornercorner with one O(2)La2MgFe trigonal pyramid, corners with two equivalent O(5)La2Fe2 trigonal pyramids, corners with two equivalent O(6)La2Fe2 trigonal pyramids, corners with three equivalent O(1)La2MgFe trigonal pyramids, corners with three equivalent O(3)La2MgFe trigonal pyramids,  an edgeedge with one O(5)La2Fe2 trigonal pyramid,  an edgeedge with one O(6)La2Fe2 trigonal pyramid, and  an edgeedge with one O(2)La2MgFe trigonal pyramid. In the fifth O site, O(5) is bonded to one La(1), one La(2), one Fe(1), and one Fe(2) atom to form distorted OLa2Fe2 trigonal pyramids that share  a cornercorner with one O(3)La2MgFe trigonal pyramid, corners with two equivalent O(4)La2Fe2 trigonal pyramids, corners with two equivalent O(6)La2Fe2 trigonal pyramids, corners with three equivalent O(1)La2MgFe trigonal pyramids, corners with three equivalent O(2)La2MgFe trigonal pyramids,  an edgeedge with one O(4)La2Fe2 trigonal pyramid,  an edgeedge with one O(6)La2Fe2 trigonal pyramid, and  an edgeedge with one O(3)La2MgFe trigonal pyramid. In the sixth O site, O(6) is bonded to one La(1), one La(2), one Fe(1), and one Fe(2) atom to form distorted OLa2Fe2 trigonal pyramids that share  a cornercorner with one O(1)La2MgFe trigonal pyramid, corners with two equivalent O(4)La2Fe2 trigonal pyramids, corners with two equivalent O(5)La2Fe2 trigonal pyramids, corners with three equivalent O(2)La2MgFe trigonal pyramids, corners with three equivalent O(3)La2MgFe trigonal pyramids,  an edgeedge with one O(4)La2Fe2 trigonal pyramid,  an edgeedge with one O(5)La2Fe2 trigonal pyramid, and  an edgeedge with one O(1)La2MgFe trigonal pyramid.
MgLa2(FeO3)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(3) atom. The Mg(1)-O(1) bond length is 1.95 Å. The Mg(1)-O(2) bond length is 1.95 Å. The Mg(1)-O(3) bond length is 1.95 Å. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom. The La(1)-O(1) bond length is 2.49 Å. The La(1)-O(2) bond length is 2.50 Å. The La(1)-O(3) bond length is 2.49 Å. The La(1)-O(4) bond length is 2.40 Å. The La(1)-O(5) bond length is 2.39 Å. The La(1)-O(6) bond length is 2.39 Å. In the second La site, La(2) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom. The La(2)-O(1) bond length is 2.36 Å. The La(2)-O(2) bond length is 2.37 Å. The La(2)-O(3) bond length is 2.36 Å. The La(2)-O(4) bond length is 2.58 Å. The La(2)-O(5) bond length is 2.55 Å. The La(2)-O(6) bond length is 2.57 Å. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in an octahedral geometry to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom. The Fe(1)-O(1) bond length is 2.23 Å. The Fe(1)-O(2) bond length is 2.19 Å. The Fe(1)-O(3) bond length is 2.23 Å. The Fe(1)-O(4) bond length is 2.21 Å. The Fe(1)-O(5) bond length is 2.26 Å. The Fe(1)-O(6) bond length is 2.26 Å. In the second Fe site, Fe(2) is bonded in a trigonal planar geometry to one O(4), one O(5), and one O(6) atom. The Fe(2)-O(4) bond length is 1.95 Å. The Fe(2)-O(5) bond length is 1.94 Å. The Fe(2)-O(6) bond length is 1.94 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded to one Mg(1), one La(1), one La(2), and one Fe(1) atom to form distorted OLa2MgFe trigonal pyramids that share  a cornercorner with one O(6)La2Fe2 trigonal pyramid, corners with two equivalent O(2)La2MgFe trigonal pyramids, corners with two equivalent O(3)La2MgFe trigonal pyramids, corners with three equivalent O(4)La2Fe2 trigonal pyramids, corners with three equivalent O(5)La2Fe2 trigonal pyramids,  an edgeedge with one O(6)La2Fe2 trigonal pyramid,  an edgeedge with one O(2)La2MgFe trigonal pyramid, and  an edgeedge with one O(3)La2MgFe trigonal pyramid. In the second O site, O(2) is bonded to one Mg(1), one La(1), one La(2), and one Fe(1) atom to form distorted OLa2MgFe trigonal pyramids that share  a cornercorner with one O(4)La2Fe2 trigonal pyramid, corners with two equivalent O(1)La2MgFe trigonal pyramids, corners with two equivalent O(3)La2MgFe trigonal pyramids, corners with three equivalent O(5)La2Fe2 trigonal pyramids, corners with three equivalent O(6)La2Fe2 trigonal pyramids,  an edgeedge with one O(4)La2Fe2 trigonal pyramid,  an edgeedge with one O(1)La2MgFe trigonal pyramid, and  an edgeedge with one O(3)La2MgFe trigonal pyramid. In the third O site, O(3) is bonded to one Mg(1), one La(1), one La(2), and one Fe(1) atom to form distorted OLa2MgFe trigonal pyramids that share  a cornercorner with one O(5)La2Fe2 trigonal pyramid, corners with two equivalent O(1)La2MgFe trigonal pyramids, corners with two equivalent O(2)La2MgFe trigonal pyramids, corners with three equivalent O(4)La2Fe2 trigonal pyramids, corners with three equivalent O(6)La2Fe2 trigonal pyramids,  an edgeedge with one O(5)La2Fe2 trigonal pyramid,  an edgeedge with one O(1)La2MgFe trigonal pyramid, and  an edgeedge with one O(2)La2MgFe trigonal pyramid. In the fourth O site, O(4) is bonded to one La(1), one La(2), one Fe(1), and one Fe(2) atom to form distorted OLa2Fe2 trigonal pyramids that share  a cornercorner with one O(2)La2MgFe trigonal pyramid, corners with two equivalent O(5)La2Fe2 trigonal pyramids, corners with two equivalent O(6)La2Fe2 trigonal pyramids, corners with three equivalent O(1)La2MgFe trigonal pyramids, corners with three equivalent O(3)La2MgFe trigonal pyramids,  an edgeedge with one O(5)La2Fe2 trigonal pyramid,  an edgeedge with one O(6)La2Fe2 trigonal pyramid, and  an edgeedge with one O(2)La2MgFe trigonal pyramid. In the fifth O site, O(5) is bonded to one La(1), one La(2), one Fe(1), and one Fe(2) atom to form distorted OLa2Fe2 trigonal pyramids that share  a cornercorner with one O(3)La2MgFe trigonal pyramid, corners with two equivalent O(4)La2Fe2 trigonal pyramids, corners with two equivalent O(6)La2Fe2 trigonal pyramids, corners with three equivalent O(1)La2MgFe trigonal pyramids, corners with three equivalent O(2)La2MgFe trigonal pyramids,  an edgeedge with one O(4)La2Fe2 trigonal pyramid,  an edgeedge with one O(6)La2Fe2 trigonal pyramid, and  an edgeedge with one O(3)La2MgFe trigonal pyramid. In the sixth O site, O(6) is bonded to one La(1), one La(2), one Fe(1), and one Fe(2) atom to form distorted OLa2Fe2 trigonal pyramids that share  a cornercorner with one O(1)La2MgFe trigonal pyramid, corners with two equivalent O(4)La2Fe2 trigonal pyramids, corners with two equivalent O(5)La2Fe2 trigonal pyramids, corners with three equivalent O(2)La2MgFe trigonal pyramids, corners with three equivalent O(3)La2MgFe trigonal pyramids,  an edgeedge with one O(4)La2Fe2 trigonal pyramid,  an edgeedge with one O(5)La2Fe2 trigonal pyramid, and  an edgeedge with one O(1)La2MgFe trigonal pyramid.