The structure described by K3(SO4)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(2), two equivalent O(3), and four equivalent O(4) atoms. In the second K site, K(2) is bonded in a 10-coordinate geometry to one O(4), three equivalent O(1), three equivalent O(2), and three equivalent O(3) atoms. S(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 distorted single-bond geometry to one K(2), two equivalent K(1), and one S(1) atom. In the second O site, O(1) is bonded in a distorted single-bond geometry to one K(1), three equivalent K(2), and one S(1) atom. In the third O site, O(2) is bonded in a distorted single-bond geometry to one K(1), three equivalent K(2), and one S(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 S(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K3(SO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.683
_cell_length_b   7.726
_cell_length_c   9.678
_cell_angle_alpha   102.377
_cell_angle_beta   90.024
_cell_angle_gamma   111.572
_symmetry_Int_Tables_number   1
_cell_volume   384.539
_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  0.732  1.000  0.750  1.0
  K  K1  1  0.268  0.000  0.250  1.0
  K  K2  1  0.420  0.381  0.652  1.0
  K  K3  1  0.580  0.619  0.349  1.0
  K  K4  1  0.039  0.619  0.849  1.0
  K  K5  1  0.961  0.381  0.151  1.0
  S  S6  1  0.394  0.227  0.965  1.0
  S  S7  1  0.606  0.773  0.035  1.0
  S  S8  1  0.167  0.773  0.535  1.0
  S  S9  1  0.833  0.227  0.465  1.0
  O  O10  1  0.584  0.696  0.881  1.0
  O  O11  1  0.416  0.304  0.119  1.0
  O  O12  1  0.889  0.304  0.619  1.0
  O  O13  1  0.111  0.696  0.381  1.0
  O  O14  1  0.635  0.309  0.905  1.0
  O  O15  1  0.365  0.691  0.095  1.0
  O  O16  1  0.326  0.690  0.595  1.0
  O  O17  1  0.674  0.310  0.405  1.0
  O  O18  1  0.187  0.254  0.893  1.0
  O  O19  1  0.813  0.746  0.107  1.0
  O  O20  1  0.932  0.746  0.607  1.0
  O  O21  1  0.068  0.254  0.393  1.0
  O  O22  1  0.319  0.013  0.937  1.0
  O  O23  1  0.681  0.987  0.063  1.0
  O  O24  1  0.306  0.987  0.563  1.0
  O  O25  1  0.694  0.013  0.437  1.0
[/CIF]
.
The structure described by K3(SO4)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(2), two equivalent O(3), and four equivalent O(4) atoms. In the second K site, K(2) is bonded in a 10-coordinate geometry to one O(4), three equivalent O(1), three equivalent O(2), and three equivalent O(3) atoms. S(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 distorted single-bond geometry to one K(2), two equivalent K(1), and one S(1) atom. In the second O site, O(1) is bonded in a distorted single-bond geometry to one K(1), three equivalent K(2), and one S(1) atom. In the third O site, O(2) is bonded in a distorted single-bond geometry to one K(1), three equivalent K(2), and one S(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 S(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K3(SO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.683
_cell_length_b   7.726
_cell_length_c   9.678
_cell_angle_alpha   102.377
_cell_angle_beta   90.024
_cell_angle_gamma   111.572
_symmetry_Int_Tables_number   1
_cell_volume   384.539
_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  0.732  1.000  0.750  1.0
  K  K1  1  0.268  0.000  0.250  1.0
  K  K2  1  0.420  0.381  0.652  1.0
  K  K3  1  0.580  0.619  0.349  1.0
  K  K4  1  0.039  0.619  0.849  1.0
  K  K5  1  0.961  0.381  0.151  1.0
  S  S6  1  0.394  0.227  0.965  1.0
  S  S7  1  0.606  0.773  0.035  1.0
  S  S8  1  0.167  0.773  0.535  1.0
  S  S9  1  0.833  0.227  0.465  1.0
  O  O10  1  0.584  0.696  0.881  1.0
  O  O11  1  0.416  0.304  0.119  1.0
  O  O12  1  0.889  0.304  0.619  1.0
  O  O13  1  0.111  0.696  0.381  1.0
  O  O14  1  0.635  0.309  0.905  1.0
  O  O15  1  0.365  0.691  0.095  1.0
  O  O16  1  0.326  0.690  0.595  1.0
  O  O17  1  0.674  0.310  0.405  1.0
  O  O18  1  0.187  0.254  0.893  1.0
  O  O19  1  0.813  0.746  0.107  1.0
  O  O20  1  0.932  0.746  0.607  1.0
  O  O21  1  0.068  0.254  0.393  1.0
  O  O22  1  0.319  0.013  0.937  1.0
  O  O23  1  0.681  0.987  0.063  1.0
  O  O24  1  0.306  0.987  0.563  1.0
  O  O25  1  0.694  0.013  0.437  1.0
[/CIF]
.