The material structure described by Rb3H(SeO4)2 crystallizes in the monoclinic C2/m space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 6-coordinate geometry to two equivalent O(1) and four equivalent O(2) atoms. In the second Rb site, Rb(2) is bonded in a 10-coordinate geometry to one O(3), three equivalent O(1), and six equivalent O(2) atoms. H(1) is bonded in a linear geometry to two equivalent O(3) atoms. Se(1) is bonded in a tetrahedral geometry to one O(1), one O(3), and two equivalent O(2) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Rb(1), three equivalent Rb(2), and one Se(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Rb(1), three equivalent Rb(2), and one Se(1) atom. In the third O site, O(3) is bonded in a distorted water-like geometry to one Rb(2), one H(1), and one Se(1) atom. is represented by the CIF file [CIF]
data_Rb3H(SeO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.104
_cell_length_b   6.104
_cell_length_c   8.359
_cell_angle_alpha   71.842
_cell_angle_beta   71.842
_cell_angle_gamma   61.464
_symmetry_Int_Tables_number   1
_cell_volume   255.022
_cell_formula_units_Z   1
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Rb  Rb0  1  0.000  0.000  0.000  1.0
  Rb  Rb1  1  0.800  0.800  0.608  1.0
  Rb  Rb2  1  0.200  0.200  0.392  1.0
  H  H3  1  0.500  0.500  0.000  1.0
  Se  Se4  1  0.577  0.577  0.235  1.0
  Se  Se5  1  0.423  0.423  0.765  1.0
  O  O6  1  0.276  0.276  0.733  1.0
  O  O7  1  0.292  0.736  0.691  1.0
  O  O8  1  0.736  0.292  0.691  1.0
  O  O9  1  0.724  0.724  0.267  1.0
  O  O10  1  0.708  0.264  0.309  1.0
  O  O11  1  0.264  0.708  0.309  1.0
  O  O12  1  0.612  0.612  0.015  1.0
  O  O13  1  0.388  0.388  0.985  1.0
[/CIF]
.
The material structure described by Rb3H(SeO4)2 crystallizes in the monoclinic C2/m space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 6-coordinate geometry to two equivalent O(1) and four equivalent O(2) atoms. In the second Rb site, Rb(2) is bonded in a 10-coordinate geometry to one O(3), three equivalent O(1), and six equivalent O(2) atoms. H(1) is bonded in a linear geometry to two equivalent O(3) atoms. Se(1) is bonded in a tetrahedral geometry to one O(1), one O(3), and two equivalent O(2) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Rb(1), three equivalent Rb(2), and one Se(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Rb(1), three equivalent Rb(2), and one Se(1) atom. In the third O site, O(3) is bonded in a distorted water-like geometry to one Rb(2), one H(1), and one Se(1) atom. is represented by the CIF file [CIF]
data_Rb3H(SeO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.104
_cell_length_b   6.104
_cell_length_c   8.359
_cell_angle_alpha   71.842
_cell_angle_beta   71.842
_cell_angle_gamma   61.464
_symmetry_Int_Tables_number   1
_cell_volume   255.022
_cell_formula_units_Z   1
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Rb  Rb0  1  0.000  0.000  0.000  1.0
  Rb  Rb1  1  0.800  0.800  0.608  1.0
  Rb  Rb2  1  0.200  0.200  0.392  1.0
  H  H3  1  0.500  0.500  0.000  1.0
  Se  Se4  1  0.577  0.577  0.235  1.0
  Se  Se5  1  0.423  0.423  0.765  1.0
  O  O6  1  0.276  0.276  0.733  1.0
  O  O7  1  0.292  0.736  0.691  1.0
  O  O8  1  0.736  0.292  0.691  1.0
  O  O9  1  0.724  0.724  0.267  1.0
  O  O10  1  0.708  0.264  0.309  1.0
  O  O11  1  0.264  0.708  0.309  1.0
  O  O12  1  0.612  0.612  0.015  1.0
  O  O13  1  0.388  0.388  0.985  1.0
[/CIF]
.