Ba2MgWCuO6 crystallizes in the monoclinic C2/m space group. Ba(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), and four equivalent O(3) atoms. Mg(1) is bonded in a square co-planar geometry to two equivalent O(1) and two equivalent O(2) atoms. W(1) is bonded in an octahedral geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. Cu(1) is bonded in a square co-planar geometry to two equivalent O(1) and two equivalent O(2) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to two equivalent Ba(1), one Mg(1), one W(1), and one Cu(1) atom. In the second O site, O(2) is bonded to two equivalent Ba(1), one Mg(1), one W(1), and one Cu(1) atom to form OBa2MgCuW trigonal bipyramids that share corners with three equivalent O(2)Ba2MgCuW trigonal bipyramids, corners with six equivalent O(3)Ba4W trigonal bipyramids,  an edgeedge with one O(2)Ba2MgCuW trigonal bipyramid, and edges with two equivalent O(3)Ba4W trigonal bipyramids. In the third O site, O(3) is bonded to four equivalent Ba(1) and one W(1) atom to form distorted OBa4W trigonal bipyramids that share corners with five equivalent O(3)Ba4W trigonal bipyramids, corners with six equivalent O(2)Ba2MgCuW trigonal bipyramids, edges with two equivalent O(2)Ba2MgCuW trigonal bipyramids, and edges with four equivalent O(3)Ba4W trigonal bipyramids.
Ba2MgWCuO6 crystallizes in the monoclinic C2/m space group. Ba(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), and four equivalent O(3) atoms. Both Ba(1)-O(1) bond lengths are 3.09 Å. Both Ba(1)-O(2) bond lengths are 2.69 Å. There are two shorter (2.93 Å) and two longer (3.32 Å) Ba(1)-O(3) bond lengths. Mg(1) is bonded in a square co-planar geometry to two equivalent O(1) and two equivalent O(2) atoms. Both Mg(1)-O(1) bond lengths are 2.00 Å. Both Mg(1)-O(2) bond lengths are 2.03 Å. W(1) is bonded in an octahedral geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. Both W(1)-O(1) bond lengths are 2.04 Å. Both W(1)-O(2) bond lengths are 2.05 Å. Both W(1)-O(3) bond lengths are 1.96 Å. Cu(1) is bonded in a square co-planar geometry to two equivalent O(1) and two equivalent O(2) atoms. Both Cu(1)-O(1) bond lengths are 1.87 Å. Both Cu(1)-O(2) bond lengths are 2.36 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to two equivalent Ba(1), one Mg(1), one W(1), and one Cu(1) atom. In the second O site, O(2) is bonded to two equivalent Ba(1), one Mg(1), one W(1), and one Cu(1) atom to form OBa2MgCuW trigonal bipyramids that share corners with three equivalent O(2)Ba2MgCuW trigonal bipyramids, corners with six equivalent O(3)Ba4W trigonal bipyramids,  an edgeedge with one O(2)Ba2MgCuW trigonal bipyramid, and edges with two equivalent O(3)Ba4W trigonal bipyramids. In the third O site, O(3) is bonded to four equivalent Ba(1) and one W(1) atom to form distorted OBa4W trigonal bipyramids that share corners with five equivalent O(3)Ba4W trigonal bipyramids, corners with six equivalent O(2)Ba2MgCuW trigonal bipyramids, edges with two equivalent O(2)Ba2MgCuW trigonal bipyramids, and edges with four equivalent O(3)Ba4W trigonal bipyramids.