MgWAsO5 crystallizes in the orthorhombic P2_12_12_1 space group. Mg(1) is bonded to one O(1), one O(3), one O(4), and two equivalent O(2) atoms to form distorted MgO5 trigonal bipyramids that share corners with four equivalent W(1)O6 octahedra and corners with two equivalent Mg(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 40-51°. W(1) is bonded to one O(3), one O(4), two equivalent O(1), and two equivalent O(5) atoms to form WO6 octahedra that share corners with four equivalent Mg(1)O5 trigonal bipyramids and edges with two equivalent W(1)O6 octahedra. As(1) is bonded in a 3-coordinate geometry to one O(2), one O(3), and one O(4) atom. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Mg(1) and two equivalent W(1) atoms. In the second O site, O(2) is bonded in a distorted T-shaped geometry to two equivalent Mg(1) and one As(1) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one Mg(1), one W(1), and one As(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Mg(1), one W(1), and one As(1) atom. In the fifth O site, O(5) is bonded in a water-like geometry to two equivalent W(1) atoms.
MgWAsO5 crystallizes in the orthorhombic P2_12_12_1 space group. Mg(1) is bonded to one O(1), one O(3), one O(4), and two equivalent O(2) atoms to form distorted MgO5 trigonal bipyramids that share corners with four equivalent W(1)O6 octahedra and corners with two equivalent Mg(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 40-51°. The Mg(1)-O(1) bond length is 2.05 Å. The Mg(1)-O(3) bond length is 2.23 Å. The Mg(1)-O(4) bond length is 2.10 Å. There is one shorter (2.02 Å) and one longer (2.26 Å) Mg(1)-O(2) bond length. W(1) is bonded to one O(3), one O(4), two equivalent O(1), and two equivalent O(5) atoms to form WO6 octahedra that share corners with four equivalent Mg(1)O5 trigonal bipyramids and edges with two equivalent W(1)O6 octahedra. The W(1)-O(3) bond length is 1.91 Å. The W(1)-O(4) bond length is 2.13 Å. There is one shorter (2.04 Å) and one longer (2.07 Å) W(1)-O(1) bond length. There is one shorter (1.98 Å) and one longer (2.01 Å) W(1)-O(5) bond length. As(1) is bonded in a 3-coordinate geometry to one O(2), one O(3), and one O(4) atom. The As(1)-O(2) bond length is 1.74 Å. The As(1)-O(3) bond length is 2.20 Å. The As(1)-O(4) bond length is 1.82 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Mg(1) and two equivalent W(1) atoms. In the second O site, O(2) is bonded in a distorted T-shaped geometry to two equivalent Mg(1) and one As(1) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one Mg(1), one W(1), and one As(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Mg(1), one W(1), and one As(1) atom. In the fifth O site, O(5) is bonded in a water-like geometry to two equivalent W(1) atoms.