Ho2SiSO4 crystallizes in the orthorhombic Pbcm space group. There are two inequivalent Ho sites. In the first Ho site, Ho(1) is bonded in a 8-coordinate geometry to two equivalent S(1), two equivalent O(2), and four equivalent O(1) atoms. In the second Ho site, Ho(2) is bonded in a 8-coordinate geometry to two equivalent S(1), two equivalent O(1), and four equivalent O(2) atoms. Si(1) is bonded in a tetrahedral geometry to two equivalent O(1) and two equivalent O(2) atoms. S(1) is bonded in a see-saw-like geometry to two equivalent Ho(1) and two equivalent Ho(2) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Ho(2), two equivalent Ho(1), and one Si(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Ho(1), two equivalent Ho(2), and one Si(1) atom.
Ho2SiSO4 crystallizes in the orthorhombic Pbcm space group. There are two inequivalent Ho sites. In the first Ho site, Ho(1) is bonded in a 8-coordinate geometry to two equivalent S(1), two equivalent O(2), and four equivalent O(1) atoms. Both Ho(1)-S(1) bond lengths are 2.84 Å. Both Ho(1)-O(2) bond lengths are 2.48 Å. There are two shorter (2.29 Å) and two longer (2.41 Å) Ho(1)-O(1) bond lengths. In the second Ho site, Ho(2) is bonded in a 8-coordinate geometry to two equivalent S(1), two equivalent O(1), and four equivalent O(2) atoms. There is one shorter (2.69 Å) and one longer (2.78 Å) Ho(2)-S(1) bond length. Both Ho(2)-O(1) bond lengths are 2.51 Å. There are two shorter (2.40 Å) and two longer (2.43 Å) Ho(2)-O(2) bond lengths. Si(1) is bonded in a tetrahedral geometry to two equivalent O(1) and two equivalent O(2) atoms. Both Si(1)-O(1) bond lengths are 1.64 Å. Both Si(1)-O(2) bond lengths are 1.64 Å. S(1) is bonded in a see-saw-like geometry to two equivalent Ho(1) and two equivalent Ho(2) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Ho(2), two equivalent Ho(1), and one Si(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Ho(1), two equivalent Ho(2), and one Si(1) atom.