Y2S2O crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a 7-coordinate geometry to two equivalent S(2), four equivalent S(1), and one O(1) atom. In the second Y site, Y(2) is bonded in a 3-coordinate geometry to one S(1), three equivalent S(2), and three equivalent O(1) atoms. There are two inequivalent S sites. In the first S site, S(1) is bonded to one Y(2) and four equivalent Y(1) atoms to form distorted SY5 trigonal bipyramids that share corners with three equivalent O(1)Y4 tetrahedra, corners with four equivalent S(1)Y5 trigonal bipyramids, edges with two equivalent O(1)Y4 tetrahedra, and edges with four equivalent S(1)Y5 trigonal bipyramids. In the second S site, S(2) is bonded in a 5-coordinate geometry to two equivalent Y(1) and three equivalent Y(2) atoms. O(1) is bonded to one Y(1) and three equivalent Y(2) atoms to form OY4 tetrahedra that share corners with four equivalent O(1)Y4 tetrahedra, corners with three equivalent S(1)Y5 trigonal bipyramids,  an edgeedge with one O(1)Y4 tetrahedra, and edges with two equivalent S(1)Y5 trigonal bipyramids.
Y2S2O crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a 7-coordinate geometry to two equivalent S(2), four equivalent S(1), and one O(1) atom. There is one shorter (2.78 Å) and one longer (2.94 Å) Y(1)-S(2) bond length. There are a spread of Y(1)-S(1) bond distances ranging from 2.74-2.84 Å. The Y(1)-O(1) bond length is 2.25 Å. In the second Y site, Y(2) is bonded in a 3-coordinate geometry to one S(1), three equivalent S(2), and three equivalent O(1) atoms. The Y(2)-S(1) bond length is 2.94 Å. There are a spread of Y(2)-S(2) bond distances ranging from 2.78-3.17 Å. There are a spread of Y(2)-O(1) bond distances ranging from 2.25-2.28 Å. There are two inequivalent S sites. In the first S site, S(1) is bonded to one Y(2) and four equivalent Y(1) atoms to form distorted SY5 trigonal bipyramids that share corners with three equivalent O(1)Y4 tetrahedra, corners with four equivalent S(1)Y5 trigonal bipyramids, edges with two equivalent O(1)Y4 tetrahedra, and edges with four equivalent S(1)Y5 trigonal bipyramids. In the second S site, S(2) is bonded in a 5-coordinate geometry to two equivalent Y(1) and three equivalent Y(2) atoms. O(1) is bonded to one Y(1) and three equivalent Y(2) atoms to form OY4 tetrahedra that share corners with four equivalent O(1)Y4 tetrahedra, corners with three equivalent S(1)Y5 trigonal bipyramids,  an edgeedge with one O(1)Y4 tetrahedra, and edges with two equivalent S(1)Y5 trigonal bipyramids.