Cs3HoO3 crystallizes in the monoclinic P2_1/c space group. There are three inequivalent Cs sites. In the first Cs site, Cs(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form distorted CsO4 tetrahedra that share corners with five equivalent Ho(1)O4 tetrahedra and  an edgeedge with one Cs(1)O4 tetrahedra. In the second Cs site, Cs(2) is bonded in a 5-coordinate geometry to one O(3), two equivalent O(1), and two equivalent O(2) atoms. In the third Cs site, Cs(3) is bonded in a 5-coordinate geometry to one O(2), two equivalent O(1), and two equivalent O(3) atoms. Ho(1) is bonded to one O(1), one O(3), and two equivalent O(2) atoms to form HoO4 tetrahedra that share corners with five equivalent Cs(1)O4 tetrahedra and  an edgeedge with one Ho(1)O4 tetrahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 7-coordinate geometry to two equivalent Cs(1), two equivalent Cs(2), two equivalent Cs(3), and one Ho(1) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to one Cs(1), one Cs(3), two equivalent Cs(2), and two equivalent Ho(1) atoms. In the third O site, O(3) is bonded in a 5-coordinate geometry to one Cs(1), one Cs(2), two equivalent Cs(3), and one Ho(1) atom.
Cs3HoO3 crystallizes in the monoclinic P2_1/c space group. There are three inequivalent Cs sites. In the first Cs site, Cs(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form distorted CsO4 tetrahedra that share corners with five equivalent Ho(1)O4 tetrahedra and  an edgeedge with one Cs(1)O4 tetrahedra. The Cs(1)-O(2) bond length is 2.95 Å. The Cs(1)-O(3) bond length is 2.90 Å. There is one shorter (2.98 Å) and one longer (3.28 Å) Cs(1)-O(1) bond length. In the second Cs site, Cs(2) is bonded in a 5-coordinate geometry to one O(3), two equivalent O(1), and two equivalent O(2) atoms. The Cs(2)-O(3) bond length is 3.13 Å. There is one shorter (2.96 Å) and one longer (3.37 Å) Cs(2)-O(1) bond length. There is one shorter (3.13 Å) and one longer (3.60 Å) Cs(2)-O(2) bond length. In the third Cs site, Cs(3) is bonded in a 5-coordinate geometry to one O(2), two equivalent O(1), and two equivalent O(3) atoms. The Cs(3)-O(2) bond length is 3.21 Å. There is one shorter (3.26 Å) and one longer (3.39 Å) Cs(3)-O(1) bond length. There is one shorter (2.83 Å) and one longer (3.19 Å) Cs(3)-O(3) bond length. Ho(1) is bonded to one O(1), one O(3), and two equivalent O(2) atoms to form HoO4 tetrahedra that share corners with five equivalent Cs(1)O4 tetrahedra and  an edgeedge with one Ho(1)O4 tetrahedra. The Ho(1)-O(1) bond length is 2.11 Å. The Ho(1)-O(3) bond length is 2.09 Å. There is one shorter (2.17 Å) and one longer (2.19 Å) Ho(1)-O(2) bond length. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 7-coordinate geometry to two equivalent Cs(1), two equivalent Cs(2), two equivalent Cs(3), and one Ho(1) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to one Cs(1), one Cs(3), two equivalent Cs(2), and two equivalent Ho(1) atoms. In the third O site, O(3) is bonded in a 5-coordinate geometry to one Cs(1), one Cs(2), two equivalent Cs(3), and one Ho(1) atom.