FeAl(WO4)2 crystallizes in the triclinic P1 space group. There are two inequivalent W sites. In the first W site, W(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(7), and one O(8) atom to form distorted WO6 pentagonal pyramids that share  a cornercorner with one Fe(1)O6 octahedra, corners with three equivalent Al(1)O5 trigonal bipyramids, edges with two equivalent W(2)O6 octahedra, and edges with two equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles are 32°. In the second W site, W(2) is bonded to one O(3), one O(4), one O(5), one O(6), one O(7), and one O(8) atom to form distorted WO6 octahedra that share  a cornercorner with one Fe(1)O6 octahedra, corners with three equivalent Al(1)O5 trigonal bipyramids, edges with two equivalent Fe(1)O6 octahedra, and edges with two equivalent W(1)O6 pentagonal pyramids. The corner-sharing octahedral tilt angles are 28°. Fe(1) is bonded to one O(2), one O(3), one O(4), one O(5), one O(7), and one O(8) atom to form distorted FeO6 octahedra that share  a cornercorner with one W(2)O6 octahedra,  a cornercorner with one W(1)O6 pentagonal pyramid, corners with three equivalent Al(1)O5 trigonal bipyramids, edges with two equivalent W(2)O6 octahedra, and edges with two equivalent W(1)O6 pentagonal pyramids. The corner-sharing octahedral tilt angles are 28°. Al(1) is bonded to one O(1), one O(2), one O(5), one O(6), and one O(8) atom to form distorted AlO5 trigonal bipyramids that share corners with three equivalent W(2)O6 octahedra, corners with three equivalent Fe(1)O6 octahedra, and corners with three equivalent W(1)O6 pentagonal pyramids. The corner-sharing octahedral tilt angles range from 26-64°. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one W(1) and one Al(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one W(1), one Fe(1), and one Al(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one W(1), one W(2), and one Fe(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal non-coplanar geometry to one W(1), one W(2), and one Fe(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one W(2), one Fe(1), and one Al(1) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one W(2) and one Al(1) atom. In the seventh O site, O(7) is bonded in a distorted trigonal non-coplanar geometry to one W(1), one W(2), and one Fe(1) atom. In the eighth O site, O(8) is bonded in a distorted rectangular see-saw-like geometry to one W(1), one W(2), one Fe(1), and one Al(1) atom.
FeAl(WO4)2 crystallizes in the triclinic P1 space group. There are two inequivalent W sites. In the first W site, W(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(7), and one O(8) atom to form distorted WO6 pentagonal pyramids that share  a cornercorner with one Fe(1)O6 octahedra, corners with three equivalent Al(1)O5 trigonal bipyramids, edges with two equivalent W(2)O6 octahedra, and edges with two equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles are 32°. The W(1)-O(1) bond length is 1.90 Å. The W(1)-O(2) bond length is 1.86 Å. The W(1)-O(3) bond length is 2.17 Å. The W(1)-O(4) bond length is 2.10 Å. The W(1)-O(7) bond length is 2.02 Å. The W(1)-O(8) bond length is 2.15 Å. In the second W site, W(2) is bonded to one O(3), one O(4), one O(5), one O(6), one O(7), and one O(8) atom to form distorted WO6 octahedra that share  a cornercorner with one Fe(1)O6 octahedra, corners with three equivalent Al(1)O5 trigonal bipyramids, edges with two equivalent Fe(1)O6 octahedra, and edges with two equivalent W(1)O6 pentagonal pyramids. The corner-sharing octahedral tilt angles are 28°. The W(2)-O(3) bond length is 1.93 Å. The W(2)-O(4) bond length is 1.93 Å. The W(2)-O(5) bond length is 1.88 Å. The W(2)-O(6) bond length is 1.82 Å. The W(2)-O(7) bond length is 2.07 Å. The W(2)-O(8) bond length is 2.26 Å. Fe(1) is bonded to one O(2), one O(3), one O(4), one O(5), one O(7), and one O(8) atom to form distorted FeO6 octahedra that share  a cornercorner with one W(2)O6 octahedra,  a cornercorner with one W(1)O6 pentagonal pyramid, corners with three equivalent Al(1)O5 trigonal bipyramids, edges with two equivalent W(2)O6 octahedra, and edges with two equivalent W(1)O6 pentagonal pyramids. The corner-sharing octahedral tilt angles are 28°. The Fe(1)-O(2) bond length is 2.49 Å. The Fe(1)-O(3) bond length is 1.96 Å. The Fe(1)-O(4) bond length is 2.26 Å. The Fe(1)-O(5) bond length is 2.36 Å. The Fe(1)-O(7) bond length is 1.95 Å. The Fe(1)-O(8) bond length is 2.29 Å. Al(1) is bonded to one O(1), one O(2), one O(5), one O(6), and one O(8) atom to form distorted AlO5 trigonal bipyramids that share corners with three equivalent W(2)O6 octahedra, corners with three equivalent Fe(1)O6 octahedra, and corners with three equivalent W(1)O6 pentagonal pyramids. The corner-sharing octahedral tilt angles range from 26-64°. The Al(1)-O(1) bond length is 1.79 Å. The Al(1)-O(2) bond length is 1.97 Å. The Al(1)-O(5) bond length is 2.01 Å. The Al(1)-O(6) bond length is 1.85 Å. The Al(1)-O(8) bond length is 1.87 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one W(1) and one Al(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one W(1), one Fe(1), and one Al(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one W(1), one W(2), and one Fe(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal non-coplanar geometry to one W(1), one W(2), and one Fe(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one W(2), one Fe(1), and one Al(1) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one W(2) and one Al(1) atom. In the seventh O site, O(7) is bonded in a distorted trigonal non-coplanar geometry to one W(1), one W(2), and one Fe(1) atom. In the eighth O site, O(8) is bonded in a distorted rectangular see-saw-like geometry to one W(1), one W(2), one Fe(1), and one Al(1) atom.