BaMgVO3 crystallizes in the monoclinic Cm space group. Ba(1) is bonded in a 8-coordinate geometry to four equivalent O(1) and four equivalent O(2) atoms. Mg(1) is bonded to one O(2) and four equivalent O(1) atoms to form distorted MgO5 trigonal bipyramids that share  a cornercorner with one V(1)O5 trigonal bipyramid, corners with four equivalent Mg(1)O5 trigonal bipyramids, and edges with four equivalent V(1)O5 trigonal bipyramids. V(1) is bonded to one O(2) and four equivalent O(1) atoms to form distorted VO5 trigonal bipyramids that share  a cornercorner with one Mg(1)O5 trigonal bipyramid, corners with four equivalent V(1)O5 trigonal bipyramids, and edges with four equivalent Mg(1)O5 trigonal bipyramids. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Ba(1), two equivalent Mg(1), and two equivalent V(1) atoms. In the second O site, O(2) is bonded in a 6-coordinate geometry to four equivalent Ba(1), one Mg(1), and one V(1) atom.
BaMgVO3 crystallizes in the monoclinic Cm space group. Ba(1) is bonded in a 8-coordinate geometry to four equivalent O(1) and four equivalent O(2) atoms. There are two shorter (3.09 Å) and two longer (3.20 Å) Ba(1)-O(1) bond lengths. There are a spread of Ba(1)-O(2) bond distances ranging from 2.67-3.03 Å. Mg(1) is bonded to one O(2) and four equivalent O(1) atoms to form distorted MgO5 trigonal bipyramids that share  a cornercorner with one V(1)O5 trigonal bipyramid, corners with four equivalent Mg(1)O5 trigonal bipyramids, and edges with four equivalent V(1)O5 trigonal bipyramids. The Mg(1)-O(2) bond length is 1.97 Å. There are two shorter (2.08 Å) and two longer (2.13 Å) Mg(1)-O(1) bond lengths. V(1) is bonded to one O(2) and four equivalent O(1) atoms to form distorted VO5 trigonal bipyramids that share  a cornercorner with one Mg(1)O5 trigonal bipyramid, corners with four equivalent V(1)O5 trigonal bipyramids, and edges with four equivalent Mg(1)O5 trigonal bipyramids. The V(1)-O(2) bond length is 2.13 Å. There are two shorter (2.07 Å) and two longer (2.13 Å) V(1)-O(1) bond lengths. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Ba(1), two equivalent Mg(1), and two equivalent V(1) atoms. In the second O site, O(2) is bonded in a 6-coordinate geometry to four equivalent Ba(1), one Mg(1), and one V(1) atom.