Tm2WO6 crystallizes in the monoclinic C2/c space group. There are three inequivalent Tm sites. In the first Tm site, Tm(1) is bonded in a 8-coordinate geometry to one O(4), one O(6), two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. In the second Tm site, Tm(2) is bonded in a 8-coordinate geometry to two equivalent O(4), two equivalent O(6), and four equivalent O(5) atoms. In the third Tm site, Tm(3) is bonded in a 8-coordinate geometry to two equivalent O(4), two equivalent O(6), and four equivalent O(1) atoms. W(1) is bonded in a 5-coordinate 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(5) is bonded in a 3-coordinate geometry to two equivalent Tm(2) and one W(1) atom. In the second O site, O(6) is bonded to one Tm(1), one Tm(2), one Tm(3), and one W(1) atom to form OTm3W tetrahedra that share corners with two equivalent O(6)Tm3W tetrahedra, corners with four equivalent O(1)Tm4 tetrahedra, and  an edgeedge with one O(1)Tm4 tetrahedra. In the third O site, O(1) is bonded to two equivalent Tm(1) and two equivalent Tm(3) atoms to form OTm4 tetrahedra that share corners with two equivalent O(1)Tm4 tetrahedra, corners with four equivalent O(6)Tm3W tetrahedra,  an edgeedge with one O(6)Tm3W tetrahedra, and edges with three equivalent O(1)Tm4 tetrahedra. In the fourth O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Tm(1) and one W(1) atom. In the fifth O site, O(3) is bonded in a distorted trigonal planar geometry to two equivalent Tm(1) and one W(1) atom. In the sixth O site, O(4) is bonded in a 4-coordinate geometry to one Tm(1), one Tm(2), one Tm(3), and one W(1) atom.
Tm2WO6 crystallizes in the monoclinic C2/c space group. There are three inequivalent Tm sites. In the first Tm site, Tm(1) is bonded in a 8-coordinate geometry to one O(4), one O(6), two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. The Tm(1)-O(4) bond length is 2.59 Å. The Tm(1)-O(6) bond length is 2.28 Å. There is one shorter (2.15 Å) and one longer (2.26 Å) Tm(1)-O(1) bond length. There is one shorter (2.38 Å) and one longer (2.44 Å) Tm(1)-O(2) bond length. There is one shorter (2.36 Å) and one longer (2.51 Å) Tm(1)-O(3) bond length. In the second Tm site, Tm(2) is bonded in a 8-coordinate geometry to two equivalent O(4), two equivalent O(6), and four equivalent O(5) atoms. Both Tm(2)-O(4) bond lengths are 2.33 Å. Both Tm(2)-O(6) bond lengths are 2.25 Å. There are two shorter (2.36 Å) and two longer (2.44 Å) Tm(2)-O(5) bond lengths. In the third Tm site, Tm(3) is bonded in a 8-coordinate geometry to two equivalent O(4), two equivalent O(6), and four equivalent O(1) atoms. Both Tm(3)-O(4) bond lengths are 2.76 Å. Both Tm(3)-O(6) bond lengths are 2.31 Å. There are two shorter (2.18 Å) and two longer (2.34 Å) Tm(3)-O(1) bond lengths. W(1) is bonded in a 5-coordinate 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 1.90 Å. The W(1)-O(3) bond length is 1.86 Å. The W(1)-O(4) bond length is 1.87 Å. The W(1)-O(5) bond length is 1.83 Å. The W(1)-O(6) bond length is 2.12 Å. There are six inequivalent O sites. In the first O site, O(5) is bonded in a 3-coordinate geometry to two equivalent Tm(2) and one W(1) atom. In the second O site, O(6) is bonded to one Tm(1), one Tm(2), one Tm(3), and one W(1) atom to form OTm3W tetrahedra that share corners with two equivalent O(6)Tm3W tetrahedra, corners with four equivalent O(1)Tm4 tetrahedra, and  an edgeedge with one O(1)Tm4 tetrahedra. In the third O site, O(1) is bonded to two equivalent Tm(1) and two equivalent Tm(3) atoms to form OTm4 tetrahedra that share corners with two equivalent O(1)Tm4 tetrahedra, corners with four equivalent O(6)Tm3W tetrahedra,  an edgeedge with one O(6)Tm3W tetrahedra, and edges with three equivalent O(1)Tm4 tetrahedra. In the fourth O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Tm(1) and one W(1) atom. In the fifth O site, O(3) is bonded in a distorted trigonal planar geometry to two equivalent Tm(1) and one W(1) atom. In the sixth O site, O(4) is bonded in a 4-coordinate geometry to one Tm(1), one Tm(2), one Tm(3), and one W(1) atom.