Fe2(WO4)3 crystallizes in the triclinic P-1 space group. There are three inequivalent W sites. In the first W site, W(1) is bonded to one O(1), one O(12), one O(6), and one O(9) atom to form WO4 tetrahedra that share corners with two equivalent Fe(2)O6 octahedra and corners with three equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 37-60°. In the second W site, W(2) is bonded to one O(10), one O(3), one O(4), and one O(7) atom to form WO4 tetrahedra that share corners with two equivalent Fe(1)O6 octahedra and corners with two equivalent Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 18-56°. In the third W site, W(3) is bonded to one O(11), one O(2), one O(5), and one O(8) atom to form WO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra and corners with two equivalent Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 17-37°. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(10), one O(2), one O(6), one O(7), and two equivalent O(9) atoms to form FeO6 octahedra that share  a cornercorner with one W(3)O4 tetrahedra, corners with two equivalent W(2)O4 tetrahedra, corners with three equivalent W(1)O4 tetrahedra, and  an edgeedge with one Fe(1)O6 octahedra. In the second Fe site, Fe(2) is bonded to one O(3), one O(4), one O(5), one O(8), and two equivalent O(1) atoms to form FeO6 octahedra that share corners with two equivalent W(1)O4 tetrahedra, corners with two equivalent W(2)O4 tetrahedra, corners with two equivalent W(3)O4 tetrahedra, and  an edgeedge with one Fe(2)O6 octahedra. There are twelve inequivalent O sites. In the first O site, O(12) is bonded in a single-bond geometry to one W(1) atom. In the second O site, O(1) is bonded in a trigonal planar geometry to one W(1) and two equivalent Fe(2) atoms. In the third O site, O(2) is bonded in a linear geometry to one W(3) and one Fe(1) atom. In the fourth O site, O(3) is bonded in a bent 150 degrees geometry to one W(2) and one Fe(2) atom. In the fifth O site, O(4) is bonded in a bent 150 degrees geometry to one W(2) and one Fe(2) atom. In the sixth O site, O(5) is bonded in a bent 150 degrees geometry to one W(3) and one Fe(2) atom. In the seventh O site, O(6) is bonded in a bent 150 degrees geometry to one W(1) and one Fe(1) atom. In the eighth O site, O(7) is bonded in a bent 120 degrees geometry to one W(2) and one Fe(1) atom. In the ninth O site, O(8) is bonded in a bent 150 degrees geometry to one W(3) and one Fe(2) atom. In the tenth O site, O(9) is bonded in a distorted trigonal planar geometry to one W(1) and two equivalent Fe(1) atoms. In the eleventh O site, O(10) is bonded in a bent 120 degrees geometry to one W(2) and one Fe(1) atom. In the twelfth O site, O(11) is bonded in a single-bond geometry to one W(3) atom.
Fe2(WO4)3 crystallizes in the triclinic P-1 space group. There are three inequivalent W sites. In the first W site, W(1) is bonded to one O(1), one O(12), one O(6), and one O(9) atom to form WO4 tetrahedra that share corners with two equivalent Fe(2)O6 octahedra and corners with three equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 37-60°. The W(1)-O(1) bond length is 1.87 Å. The W(1)-O(12) bond length is 1.74 Å. The W(1)-O(6) bond length is 1.81 Å. The W(1)-O(9) bond length is 1.89 Å. In the second W site, W(2) is bonded to one O(10), one O(3), one O(4), and one O(7) atom to form WO4 tetrahedra that share corners with two equivalent Fe(1)O6 octahedra and corners with two equivalent Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 18-56°. The W(2)-O(10) bond length is 1.82 Å. The W(2)-O(3) bond length is 1.82 Å. The W(2)-O(4) bond length is 1.84 Å. The W(2)-O(7) bond length is 1.81 Å. In the third W site, W(3) is bonded to one O(11), one O(2), one O(5), and one O(8) atom to form WO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra and corners with two equivalent Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 17-37°. The W(3)-O(11) bond length is 1.75 Å. The W(3)-O(2) bond length is 1.84 Å. The W(3)-O(5) bond length is 1.84 Å. The W(3)-O(8) bond length is 1.84 Å. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(10), one O(2), one O(6), one O(7), and two equivalent O(9) atoms to form FeO6 octahedra that share  a cornercorner with one W(3)O4 tetrahedra, corners with two equivalent W(2)O4 tetrahedra, corners with three equivalent W(1)O4 tetrahedra, and  an edgeedge with one Fe(1)O6 octahedra. The Fe(1)-O(10) bond length is 2.01 Å. The Fe(1)-O(2) bond length is 1.93 Å. The Fe(1)-O(6) bond length is 1.96 Å. The Fe(1)-O(7) bond length is 2.03 Å. There is one shorter (2.10 Å) and one longer (2.18 Å) Fe(1)-O(9) bond length. In the second Fe site, Fe(2) is bonded to one O(3), one O(4), one O(5), one O(8), and two equivalent O(1) atoms to form FeO6 octahedra that share corners with two equivalent W(1)O4 tetrahedra, corners with two equivalent W(2)O4 tetrahedra, corners with two equivalent W(3)O4 tetrahedra, and  an edgeedge with one Fe(2)O6 octahedra. The Fe(2)-O(3) bond length is 2.00 Å. The Fe(2)-O(4) bond length is 2.02 Å. The Fe(2)-O(5) bond length is 1.99 Å. The Fe(2)-O(8) bond length is 1.97 Å. There is one shorter (2.10 Å) and one longer (2.14 Å) Fe(2)-O(1) bond length. There are twelve inequivalent O sites. In the first O site, O(12) is bonded in a single-bond geometry to one W(1) atom. In the second O site, O(1) is bonded in a trigonal planar geometry to one W(1) and two equivalent Fe(2) atoms. In the third O site, O(2) is bonded in a linear geometry to one W(3) and one Fe(1) atom. In the fourth O site, O(3) is bonded in a bent 150 degrees geometry to one W(2) and one Fe(2) atom. In the fifth O site, O(4) is bonded in a bent 150 degrees geometry to one W(2) and one Fe(2) atom. In the sixth O site, O(5) is bonded in a bent 150 degrees geometry to one W(3) and one Fe(2) atom. In the seventh O site, O(6) is bonded in a bent 150 degrees geometry to one W(1) and one Fe(1) atom. In the eighth O site, O(7) is bonded in a bent 120 degrees geometry to one W(2) and one Fe(1) atom. In the ninth O site, O(8) is bonded in a bent 150 degrees geometry to one W(3) and one Fe(2) atom. In the tenth O site, O(9) is bonded in a distorted trigonal planar geometry to one W(1) and two equivalent Fe(1) atoms. In the eleventh O site, O(10) is bonded in a bent 120 degrees geometry to one W(2) and one Fe(1) atom. In the twelfth O site, O(11) is bonded in a single-bond geometry to one W(3) atom.