MgWSi2O6 is Esseneite structured and crystallizes in the monoclinic C2/c space group. Mg(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form MgO6 octahedra that share corners with eight equivalent Si(1)O4 tetrahedra and edges with three equivalent W(1)O6 octahedra. W(1) is bonded to two equivalent O(2) and four equivalent O(3) atoms to form distorted WO6 octahedra that share corners with six equivalent Si(1)O4 tetrahedra, edges with two equivalent W(1)O6 octahedra, and edges with three equivalent Mg(1)O6 octahedra. Si(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form SiO4 tetrahedra that share corners with three equivalent W(1)O6 octahedra, corners with four equivalent Mg(1)O6 octahedra, and corners with two equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 45-61°. There are three inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Mg(1) and two equivalent Si(1) atoms. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Mg(1), one W(1), and one Si(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Mg(1), two equivalent W(1), and one Si(1) atom.
MgWSi2O6 is Esseneite structured and crystallizes in the monoclinic C2/c space group. Mg(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form MgO6 octahedra that share corners with eight equivalent Si(1)O4 tetrahedra and edges with three equivalent W(1)O6 octahedra. Both Mg(1)-O(1) bond lengths are 2.25 Å. Both Mg(1)-O(2) bond lengths are 2.03 Å. Both Mg(1)-O(3) bond lengths are 2.32 Å. W(1) is bonded to two equivalent O(2) and four equivalent O(3) atoms to form distorted WO6 octahedra that share corners with six equivalent Si(1)O4 tetrahedra, edges with two equivalent W(1)O6 octahedra, and edges with three equivalent Mg(1)O6 octahedra. Both W(1)-O(2) bond lengths are 2.24 Å. There are two shorter (2.24 Å) and two longer (2.28 Å) W(1)-O(3) bond lengths. Si(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form SiO4 tetrahedra that share corners with three equivalent W(1)O6 octahedra, corners with four equivalent Mg(1)O6 octahedra, and corners with two equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 45-61°. The Si(1)-O(2) bond length is 1.60 Å. The Si(1)-O(3) bond length is 1.63 Å. There is one shorter (1.69 Å) and one longer (1.70 Å) Si(1)-O(1) bond length. There are three inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Mg(1) and two equivalent Si(1) atoms. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Mg(1), one W(1), and one Si(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Mg(1), two equivalent W(1), and one Si(1) atom.