The crystal structure described by K3(SeO4)2 crystallizes in the monoclinic C2/c space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 10-coordinate geometry to two equivalent O(1), two equivalent O(3), two equivalent O(4), and four equivalent O(2) atoms. In the second K site, K(2) is bonded in a 10-coordinate geometry to one O(2), three equivalent O(1), three equivalent O(3), and three equivalent O(4) atoms. Se(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. There are four inequivalent O sites. In the first O site, O(4) is bonded in a 1-coordinate geometry to one K(1), three equivalent K(2), and one Se(1) atom. In the second O site, O(1) is bonded in a 1-coordinate geometry to one K(1), three equivalent K(2), and one Se(1) atom. In the third O site, O(2) is bonded in a distorted single-bond geometry to one K(2), two equivalent K(1), and one Se(1) atom. In the fourth O site, O(3) is bonded in a distorted single-bond geometry to one K(1), three equivalent K(2), and one Se(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K3(SeO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.176
_cell_length_b   8.176
_cell_length_c   10.278
_cell_angle_alpha   77.924
_cell_angle_beta   77.924
_cell_angle_gamma   42.989
_symmetry_Int_Tables_number   1
_cell_volume   456.467
_cell_formula_units_Z   2
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
  K  K0  1  0.763  0.237  0.250  1.0
  K  K1  1  0.237  0.763  0.750  1.0
  K  K2  1  0.930  0.459  0.848  1.0
  K  K3  1  0.459  0.930  0.348  1.0
  K  K4  1  0.070  0.541  0.152  1.0
  K  K5  1  0.541  0.070  0.652  1.0
  Se  Se6  1  0.339  0.890  0.038  1.0
  Se  Se7  1  0.890  0.339  0.538  1.0
  Se  Se8  1  0.661  0.110  0.962  1.0
  Se  Se9  1  0.110  0.661  0.462  1.0
  O  O10  1  0.166  0.151  0.101  1.0
  O  O11  1  0.151  0.166  0.601  1.0
  O  O12  1  0.834  0.849  0.899  1.0
  O  O13  1  0.849  0.834  0.399  1.0
  O  O14  1  0.184  0.816  0.066  1.0
  O  O15  1  0.816  0.184  0.566  1.0
  O  O16  1  0.816  0.184  0.934  1.0
  O  O17  1  0.184  0.816  0.434  1.0
  O  O18  1  0.404  0.906  0.874  1.0
  O  O19  1  0.906  0.404  0.374  1.0
  O  O20  1  0.596  0.094  0.126  1.0
  O  O21  1  0.094  0.596  0.626  1.0
  O  O22  1  0.588  0.666  0.118  1.0
  O  O23  1  0.666  0.588  0.618  1.0
  O  O24  1  0.412  0.334  0.882  1.0
  O  O25  1  0.334  0.412  0.382  1.0
[/CIF]
.
The crystal structure described by K3(SeO4)2 crystallizes in the monoclinic C2/c space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 10-coordinate geometry to two equivalent O(1), two equivalent O(3), two equivalent O(4), and four equivalent O(2) atoms. In the second K site, K(2) is bonded in a 10-coordinate geometry to one O(2), three equivalent O(1), three equivalent O(3), and three equivalent O(4) atoms. Se(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. There are four inequivalent O sites. In the first O site, O(4) is bonded in a 1-coordinate geometry to one K(1), three equivalent K(2), and one Se(1) atom. In the second O site, O(1) is bonded in a 1-coordinate geometry to one K(1), three equivalent K(2), and one Se(1) atom. In the third O site, O(2) is bonded in a distorted single-bond geometry to one K(2), two equivalent K(1), and one Se(1) atom. In the fourth O site, O(3) is bonded in a distorted single-bond geometry to one K(1), three equivalent K(2), and one Se(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K3(SeO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.176
_cell_length_b   8.176
_cell_length_c   10.278
_cell_angle_alpha   77.924
_cell_angle_beta   77.924
_cell_angle_gamma   42.989
_symmetry_Int_Tables_number   1
_cell_volume   456.467
_cell_formula_units_Z   2
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
  K  K0  1  0.763  0.237  0.250  1.0
  K  K1  1  0.237  0.763  0.750  1.0
  K  K2  1  0.930  0.459  0.848  1.0
  K  K3  1  0.459  0.930  0.348  1.0
  K  K4  1  0.070  0.541  0.152  1.0
  K  K5  1  0.541  0.070  0.652  1.0
  Se  Se6  1  0.339  0.890  0.038  1.0
  Se  Se7  1  0.890  0.339  0.538  1.0
  Se  Se8  1  0.661  0.110  0.962  1.0
  Se  Se9  1  0.110  0.661  0.462  1.0
  O  O10  1  0.166  0.151  0.101  1.0
  O  O11  1  0.151  0.166  0.601  1.0
  O  O12  1  0.834  0.849  0.899  1.0
  O  O13  1  0.849  0.834  0.399  1.0
  O  O14  1  0.184  0.816  0.066  1.0
  O  O15  1  0.816  0.184  0.566  1.0
  O  O16  1  0.816  0.184  0.934  1.0
  O  O17  1  0.184  0.816  0.434  1.0
  O  O18  1  0.404  0.906  0.874  1.0
  O  O19  1  0.906  0.404  0.374  1.0
  O  O20  1  0.596  0.094  0.126  1.0
  O  O21  1  0.094  0.596  0.626  1.0
  O  O22  1  0.588  0.666  0.118  1.0
  O  O23  1  0.666  0.588  0.618  1.0
  O  O24  1  0.412  0.334  0.882  1.0
  O  O25  1  0.334  0.412  0.382  1.0
[/CIF]
.