MgGa4(WO6)2 crystallizes in the orthorhombic Amm2 space group. Mg(1) is bonded to two equivalent O(1) and two equivalent O(3) atoms to form distorted MgO4 tetrahedra that share corners with two equivalent W(1)O6 octahedra, corners with two equivalent Ga(1)O6 octahedra, and  an edgeedge with one W(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 6-59°. There are two inequivalent W sites. In the first W site, W(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(6) atoms to form WO6 octahedra that share corners with two equivalent Mg(1)O4 tetrahedra, edges with two equivalent Ga(1)O6 octahedra, and  an edgeedge with one Mg(1)O4 tetrahedra. In the second W site, W(2) is bonded to one O(5) and four equivalent O(4) atoms to form distorted WO5 square pyramids that share corners with six equivalent Ga(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 38-50°. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to one O(1), one O(2), one O(5), one O(6), and two equivalent O(4) atoms to form distorted GaO6 octahedra that share corners with three equivalent W(2)O5 square pyramids,  a cornercorner with one Mg(1)O4 tetrahedra,  an edgeedge with one W(1)O6 octahedra, and  an edgeedge with one Ga(1)O6 octahedra. In the second Ga site, Ga(2) is bonded in a 5-coordinate geometry to one O(6), two equivalent O(3), and two equivalent O(4) atoms. There are six inequivalent O sites. In the first O site, O(1) is bonded in a T-shaped geometry to one Mg(1), one W(1), and one Ga(1) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to two equivalent Ga(1) atoms. In the third O site, O(3) is bonded to one Mg(1), one W(1), and two equivalent Ga(2) atoms to form a mixture of distorted face and corner-sharing OMgGa2W trigonal pyramids. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one W(2), one Ga(1), and one Ga(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one W(2) and two equivalent Ga(1) atoms. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one W(1), one Ga(1), and one Ga(2) atom.
MgGa4(WO6)2 crystallizes in the orthorhombic Amm2 space group. Mg(1) is bonded to two equivalent O(1) and two equivalent O(3) atoms to form distorted MgO4 tetrahedra that share corners with two equivalent W(1)O6 octahedra, corners with two equivalent Ga(1)O6 octahedra, and  an edgeedge with one W(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 6-59°. Both Mg(1)-O(1) bond lengths are 1.91 Å. Both Mg(1)-O(3) bond lengths are 1.98 Å. There are two inequivalent W sites. In the first W site, W(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(6) atoms to form WO6 octahedra that share corners with two equivalent Mg(1)O4 tetrahedra, edges with two equivalent Ga(1)O6 octahedra, and  an edgeedge with one Mg(1)O4 tetrahedra. Both W(1)-O(1) bond lengths are 2.04 Å. Both W(1)-O(3) bond lengths are 2.13 Å. Both W(1)-O(6) bond lengths are 2.06 Å. In the second W site, W(2) is bonded to one O(5) and four equivalent O(4) atoms to form distorted WO5 square pyramids that share corners with six equivalent Ga(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 38-50°. The W(2)-O(5) bond length is 1.78 Å. All W(2)-O(4) bond lengths are 1.95 Å. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to one O(1), one O(2), one O(5), one O(6), and two equivalent O(4) atoms to form distorted GaO6 octahedra that share corners with three equivalent W(2)O5 square pyramids,  a cornercorner with one Mg(1)O4 tetrahedra,  an edgeedge with one W(1)O6 octahedra, and  an edgeedge with one Ga(1)O6 octahedra. The Ga(1)-O(1) bond length is 1.87 Å. The Ga(1)-O(2) bond length is 1.82 Å. The Ga(1)-O(5) bond length is 2.45 Å. The Ga(1)-O(6) bond length is 2.10 Å. Both Ga(1)-O(4) bond lengths are 2.08 Å. In the second Ga site, Ga(2) is bonded in a 5-coordinate geometry to one O(6), two equivalent O(3), and two equivalent O(4) atoms. The Ga(2)-O(6) bond length is 1.84 Å. Both Ga(2)-O(3) bond lengths are 2.10 Å. Both Ga(2)-O(4) bond lengths are 2.02 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a T-shaped geometry to one Mg(1), one W(1), and one Ga(1) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to two equivalent Ga(1) atoms. In the third O site, O(3) is bonded to one Mg(1), one W(1), and two equivalent Ga(2) atoms to form a mixture of distorted face and corner-sharing OMgGa2W trigonal pyramids. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one W(2), one Ga(1), and one Ga(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one W(2) and two equivalent Ga(1) atoms. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one W(1), one Ga(1), and one Ga(2) atom.