The compound described by K2CrSO7 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to one O(2), one O(4), one O(6), one O(7), two equivalent O(1), and two equivalent O(5) atoms. In the second K site, K(2) is bonded in a 8-coordinate geometry to one O(1), one O(3), one O(5), one O(7), two equivalent O(2), and two equivalent O(4) atoms. Cr(1) is bonded to one O(1), one O(3), one O(5), and one O(6) atom to form CrO4 tetrahedra that share  a cornercorner with one S(1)O4 tetrahedra. S(1) is bonded to one O(2), one O(3), one O(4), and one O(7) atom to form SO4 tetrahedra that share  a cornercorner with one Cr(1)O4 tetrahedra. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one K(2), two equivalent K(1), and one Cr(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one K(1), two equivalent K(2), and one S(1) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one K(2), one Cr(1), and one S(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one K(1), two equivalent K(2), and one S(1) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one K(2), two equivalent K(1), and one Cr(1) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one K(1) and one Cr(1) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one K(1), one K(2), and one S(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K2CrSO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.523
_cell_length_b   7.530
_cell_length_c   15.023
_cell_angle_alpha   61.383
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   747.119
_cell_formula_units_Z   4
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  0.381  0.976  0.656  1.0
  K  K1  1  0.207  0.458  0.864  1.0
  K  K2  1  0.881  0.024  0.844  1.0
  K  K3  1  0.293  0.458  0.364  1.0
  K  K4  1  0.793  0.542  0.136  1.0
  K  K5  1  0.707  0.542  0.636  1.0
  K  K6  1  0.619  0.024  0.344  1.0
  K  K7  1  0.119  0.976  0.156  1.0
  Cr  Cr8  1  0.331  0.907  0.920  1.0
  Cr  Cr9  1  0.669  0.093  0.080  1.0
  Cr  Cr10  1  0.831  0.093  0.580  1.0
  Cr  Cr11  1  0.169  0.907  0.420  1.0
  S  S12  1  0.709  0.503  0.884  1.0
  S  S13  1  0.209  0.497  0.616  1.0
  S  S14  1  0.291  0.497  0.116  1.0
  S  S15  1  0.791  0.503  0.384  1.0
  O  O16  1  0.715  0.156  0.653  1.0
  O  O17  1  0.074  0.373  0.691  1.0
  O  O18  1  0.092  0.677  0.530  1.0
  O  O19  1  0.833  0.407  0.844  1.0
  O  O20  1  0.203  0.038  0.954  1.0
  O  O21  1  0.215  0.844  0.847  1.0
  O  O22  1  0.574  0.627  0.809  1.0
  O  O23  1  0.797  0.962  0.046  1.0
  O  O24  1  0.997  0.039  0.359  1.0
  O  O25  1  0.408  0.677  0.030  1.0
  O  O26  1  0.299  0.396  0.567  1.0
  O  O27  1  0.926  0.627  0.309  1.0
  O  O28  1  0.799  0.604  0.933  1.0
  O  O29  1  0.667  0.407  0.344  1.0
  O  O30  1  0.297  0.038  0.454  1.0
  O  O31  1  0.701  0.604  0.433  1.0
  O  O32  1  0.003  0.961  0.641  1.0
  O  O33  1  0.908  0.323  0.470  1.0
  O  O34  1  0.497  0.961  0.141  1.0
  O  O35  1  0.333  0.593  0.656  1.0
  O  O36  1  0.285  0.844  0.347  1.0
  O  O37  1  0.201  0.396  0.067  1.0
  O  O38  1  0.503  0.039  0.859  1.0
  O  O39  1  0.426  0.373  0.191  1.0
  O  O40  1  0.592  0.323  0.970  1.0
  O  O41  1  0.703  0.962  0.546  1.0
  O  O42  1  0.167  0.593  0.156  1.0
  O  O43  1  0.785  0.156  0.153  1.0
[/CIF]
.
The compound described by K2CrSO7 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to one O(2), one O(4), one O(6), one O(7), two equivalent O(1), and two equivalent O(5) atoms. In the second K site, K(2) is bonded in a 8-coordinate geometry to one O(1), one O(3), one O(5), one O(7), two equivalent O(2), and two equivalent O(4) atoms. Cr(1) is bonded to one O(1), one O(3), one O(5), and one O(6) atom to form CrO4 tetrahedra that share  a cornercorner with one S(1)O4 tetrahedra. S(1) is bonded to one O(2), one O(3), one O(4), and one O(7) atom to form SO4 tetrahedra that share  a cornercorner with one Cr(1)O4 tetrahedra. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one K(2), two equivalent K(1), and one Cr(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one K(1), two equivalent K(2), and one S(1) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one K(2), one Cr(1), and one S(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one K(1), two equivalent K(2), and one S(1) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one K(2), two equivalent K(1), and one Cr(1) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one K(1) and one Cr(1) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one K(1), one K(2), and one S(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K2CrSO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.523
_cell_length_b   7.530
_cell_length_c   15.023
_cell_angle_alpha   61.383
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   747.119
_cell_formula_units_Z   4
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  0.381  0.976  0.656  1.0
  K  K1  1  0.207  0.458  0.864  1.0
  K  K2  1  0.881  0.024  0.844  1.0
  K  K3  1  0.293  0.458  0.364  1.0
  K  K4  1  0.793  0.542  0.136  1.0
  K  K5  1  0.707  0.542  0.636  1.0
  K  K6  1  0.619  0.024  0.344  1.0
  K  K7  1  0.119  0.976  0.156  1.0
  Cr  Cr8  1  0.331  0.907  0.920  1.0
  Cr  Cr9  1  0.669  0.093  0.080  1.0
  Cr  Cr10  1  0.831  0.093  0.580  1.0
  Cr  Cr11  1  0.169  0.907  0.420  1.0
  S  S12  1  0.709  0.503  0.884  1.0
  S  S13  1  0.209  0.497  0.616  1.0
  S  S14  1  0.291  0.497  0.116  1.0
  S  S15  1  0.791  0.503  0.384  1.0
  O  O16  1  0.715  0.156  0.653  1.0
  O  O17  1  0.074  0.373  0.691  1.0
  O  O18  1  0.092  0.677  0.530  1.0
  O  O19  1  0.833  0.407  0.844  1.0
  O  O20  1  0.203  0.038  0.954  1.0
  O  O21  1  0.215  0.844  0.847  1.0
  O  O22  1  0.574  0.627  0.809  1.0
  O  O23  1  0.797  0.962  0.046  1.0
  O  O24  1  0.997  0.039  0.359  1.0
  O  O25  1  0.408  0.677  0.030  1.0
  O  O26  1  0.299  0.396  0.567  1.0
  O  O27  1  0.926  0.627  0.309  1.0
  O  O28  1  0.799  0.604  0.933  1.0
  O  O29  1  0.667  0.407  0.344  1.0
  O  O30  1  0.297  0.038  0.454  1.0
  O  O31  1  0.701  0.604  0.433  1.0
  O  O32  1  0.003  0.961  0.641  1.0
  O  O33  1  0.908  0.323  0.470  1.0
  O  O34  1  0.497  0.961  0.141  1.0
  O  O35  1  0.333  0.593  0.656  1.0
  O  O36  1  0.285  0.844  0.347  1.0
  O  O37  1  0.201  0.396  0.067  1.0
  O  O38  1  0.503  0.039  0.859  1.0
  O  O39  1  0.426  0.373  0.191  1.0
  O  O40  1  0.592  0.323  0.970  1.0
  O  O41  1  0.703  0.962  0.546  1.0
  O  O42  1  0.167  0.593  0.156  1.0
  O  O43  1  0.785  0.156  0.153  1.0
[/CIF]
.