Ho2WO6 crystallizes in the monoclinic C2/c space group. There are three inequivalent Ho sites. In the first Ho site, Ho(1) is bonded in a 8-coordinate geometry to two equivalent O(3), two equivalent O(5), and four equivalent O(1) atoms. In the second Ho site, Ho(2) is bonded in a 8-coordinate geometry to two equivalent O(3), two equivalent O(5), and four equivalent O(4) atoms. In the third Ho site, Ho(3) is bonded in a 8-coordinate geometry to one O(3), one O(5), two equivalent O(1), two equivalent O(2), and two equivalent O(6) atoms. W(1) is bonded in a distorted trigonal bipyramidal geometry to one O(2), one O(3), one O(4), one O(5), and one O(6) atom. There are six inequivalent O sites. In the first O site, O(6) is bonded in a distorted trigonal planar geometry to two equivalent Ho(3) and one W(1) atom. In the second O site, O(1) is bonded to two equivalent Ho(1) and two equivalent Ho(3) atoms to form OHo4 tetrahedra that share corners with two equivalent O(1)Ho4 tetrahedra, corners with four equivalent O(3)Ho3W tetrahedra,  an edgeedge with one O(3)Ho3W tetrahedra, and edges with three equivalent O(1)Ho4 tetrahedra. In the third O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Ho(3) and one W(1) atom. In the fourth O site, O(3) is bonded to one Ho(1), one Ho(2), one Ho(3), and one W(1) atom to form OHo3W tetrahedra that share corners with two equivalent O(3)Ho3W tetrahedra, corners with four equivalent O(1)Ho4 tetrahedra, and  an edgeedge with one O(1)Ho4 tetrahedra. In the fifth O site, O(4) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Ho(2) and one W(1) atom. In the sixth O site, O(5) is bonded in a 4-coordinate geometry to one Ho(1), one Ho(2), one Ho(3), and one W(1) atom.
Ho2WO6 crystallizes in the monoclinic C2/c space group. There are three inequivalent Ho sites. In the first Ho site, Ho(1) is bonded in a 8-coordinate geometry to two equivalent O(3), two equivalent O(5), and four equivalent O(1) atoms. Both Ho(1)-O(3) bond lengths are 2.34 Å. Both Ho(1)-O(5) bond lengths are 2.77 Å. There are two shorter (2.21 Å) and two longer (2.37 Å) Ho(1)-O(1) bond lengths. In the second Ho site, Ho(2) is bonded in a 8-coordinate geometry to two equivalent O(3), two equivalent O(5), and four equivalent O(4) atoms. Both Ho(2)-O(3) bond lengths are 2.27 Å. Both Ho(2)-O(5) bond lengths are 2.37 Å. There are two shorter (2.37 Å) and two longer (2.46 Å) Ho(2)-O(4) bond lengths. In the third Ho site, Ho(3) is bonded in a 8-coordinate geometry to one O(3), one O(5), two equivalent O(1), two equivalent O(2), and two equivalent O(6) atoms. The Ho(3)-O(3) bond length is 2.31 Å. The Ho(3)-O(5) bond length is 2.62 Å. There is one shorter (2.18 Å) and one longer (2.28 Å) Ho(3)-O(1) bond length. There is one shorter (2.40 Å) and one longer (2.46 Å) Ho(3)-O(2) bond length. There is one shorter (2.39 Å) and one longer (2.54 Å) Ho(3)-O(6) bond length. W(1) is bonded in a distorted trigonal bipyramidal geometry to one O(2), one O(3), one O(4), one O(5), and one O(6) atom. The W(1)-O(2) bond length is 1.89 Å. The W(1)-O(3) bond length is 2.11 Å. The W(1)-O(4) bond length is 1.84 Å. The W(1)-O(5) bond length is 1.87 Å. The W(1)-O(6) bond length is 1.86 Å. There are six inequivalent O sites. In the first O site, O(6) is bonded in a distorted trigonal planar geometry to two equivalent Ho(3) and one W(1) atom. In the second O site, O(1) is bonded to two equivalent Ho(1) and two equivalent Ho(3) atoms to form OHo4 tetrahedra that share corners with two equivalent O(1)Ho4 tetrahedra, corners with four equivalent O(3)Ho3W tetrahedra,  an edgeedge with one O(3)Ho3W tetrahedra, and edges with three equivalent O(1)Ho4 tetrahedra. In the third O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Ho(3) and one W(1) atom. In the fourth O site, O(3) is bonded to one Ho(1), one Ho(2), one Ho(3), and one W(1) atom to form OHo3W tetrahedra that share corners with two equivalent O(3)Ho3W tetrahedra, corners with four equivalent O(1)Ho4 tetrahedra, and  an edgeedge with one O(1)Ho4 tetrahedra. In the fifth O site, O(4) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Ho(2) and one W(1) atom. In the sixth O site, O(5) is bonded in a 4-coordinate geometry to one Ho(1), one Ho(2), one Ho(3), and one W(1) atom.