The crystal structure described by CsCrAs2O7 crystallizes in the monoclinic P2_1/c space group. Cs(1) is bonded in a 10-coordinate geometry to one O(1), one O(3), one O(4), one O(5), two equivalent O(2), two equivalent O(6), and two equivalent O(7) atoms. Cr(1) is bonded to one O(1), one O(2), one O(3), one O(5), one O(6), and one O(7) atom to form CrO6 octahedra that share corners with three equivalent As(1)O4 tetrahedra and corners with three equivalent As(2)O4 tetrahedra. There are two inequivalent As sites. In the first As site, As(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form AsO4 tetrahedra that share corners with three equivalent Cr(1)O6 octahedra and  a cornercorner with one As(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 28-54°. In the second As site, As(2) is bonded to one O(4), one O(5), one O(6), and one O(7) atom to form AsO4 tetrahedra that share corners with three equivalent Cr(1)O6 octahedra and  a cornercorner with one As(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 18-46°. There are seven inequivalent O sites. In the first O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Cs(1), one Cr(1), and one As(2) atom. In the second O site, O(6) is bonded in a 2-coordinate geometry to two equivalent Cs(1), one Cr(1), and one As(2) atom. In the third O site, O(7) is bonded in a 2-coordinate geometry to two equivalent Cs(1), one Cr(1), and one As(2) atom. In the fourth O site, O(1) is bonded in a bent 150 degrees geometry to one Cs(1), one Cr(1), and one As(1) atom. In the fifth O site, O(2) is bonded in a 2-coordinate geometry to two equivalent Cs(1), one Cr(1), and one As(1) atom. In the sixth O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Cs(1), one Cr(1), and one As(1) atom. In the seventh O site, O(4) is bonded in a bent 120 degrees geometry to one Cs(1), one As(1), and one As(2) atom. is represented by the CIF file [CIF]
data_CsCrAs2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.116
_cell_length_b   7.937
_cell_length_c   8.692
_cell_angle_alpha   74.102
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   671.178
_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
  Cs  Cs0  1  0.196  0.679  0.456  1.0
  Cs  Cs1  1  0.696  0.321  0.044  1.0
  Cs  Cs2  1  0.804  0.321  0.544  1.0
  Cs  Cs3  1  0.304  0.679  0.956  1.0
  Cr  Cr4  1  0.399  0.261  0.767  1.0
  Cr  Cr5  1  0.899  0.739  0.733  1.0
  Cr  Cr6  1  0.601  0.739  0.233  1.0
  Cr  Cr7  1  0.101  0.261  0.267  1.0
  As  As8  1  0.132  0.069  0.686  1.0
  As  As9  1  0.632  0.931  0.814  1.0
  As  As10  1  0.868  0.931  0.314  1.0
  As  As11  1  0.368  0.069  0.186  1.0
  As  As12  1  0.089  0.364  0.841  1.0
  As  As13  1  0.589  0.636  0.659  1.0
  As  As14  1  0.911  0.636  0.159  1.0
  As  As15  1  0.411  0.364  0.341  1.0
  O  O16  1  0.105  0.205  0.504  1.0
  O  O17  1  0.605  0.795  0.996  1.0
  O  O18  1  0.895  0.795  0.496  1.0
  O  O19  1  0.395  0.205  0.004  1.0
  O  O20  1  0.076  0.864  0.718  1.0
  O  O21  1  0.576  0.136  0.782  1.0
  O  O22  1  0.924  0.136  0.282  1.0
  O  O23  1  0.424  0.864  0.218  1.0
  O  O24  1  0.290  0.058  0.753  1.0
  O  O25  1  0.790  0.942  0.747  1.0
  O  O26  1  0.710  0.942  0.247  1.0
  O  O27  1  0.210  0.058  0.253  1.0
  O  O28  1  0.036  0.162  0.814  1.0
  O  O29  1  0.536  0.838  0.686  1.0
  O  O30  1  0.964  0.838  0.186  1.0
  O  O31  1  0.464  0.162  0.314  1.0
  O  O32  1  0.080  0.348  0.035  1.0
  O  O33  1  0.580  0.652  0.465  1.0
  O  O34  1  0.920  0.652  0.965  1.0
  O  O35  1  0.420  0.348  0.535  1.0
  O  O36  1  0.992  0.517  0.723  1.0
  O  O37  1  0.492  0.483  0.777  1.0
  O  O38  1  0.008  0.483  0.277  1.0
  O  O39  1  0.508  0.517  0.223  1.0
  O  O40  1  0.241  0.403  0.758  1.0
  O  O41  1  0.741  0.597  0.742  1.0
  O  O42  1  0.759  0.597  0.242  1.0
  O  O43  1  0.259  0.403  0.258  1.0
[/CIF]
.
The crystal structure described by CsCrAs2O7 crystallizes in the monoclinic P2_1/c space group. Cs(1) is bonded in a 10-coordinate geometry to one O(1), one O(3), one O(4), one O(5), two equivalent O(2), two equivalent O(6), and two equivalent O(7) atoms. Cr(1) is bonded to one O(1), one O(2), one O(3), one O(5), one O(6), and one O(7) atom to form CrO6 octahedra that share corners with three equivalent As(1)O4 tetrahedra and corners with three equivalent As(2)O4 tetrahedra. There are two inequivalent As sites. In the first As site, As(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form AsO4 tetrahedra that share corners with three equivalent Cr(1)O6 octahedra and  a cornercorner with one As(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 28-54°. In the second As site, As(2) is bonded to one O(4), one O(5), one O(6), and one O(7) atom to form AsO4 tetrahedra that share corners with three equivalent Cr(1)O6 octahedra and  a cornercorner with one As(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 18-46°. There are seven inequivalent O sites. In the first O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Cs(1), one Cr(1), and one As(2) atom. In the second O site, O(6) is bonded in a 2-coordinate geometry to two equivalent Cs(1), one Cr(1), and one As(2) atom. In the third O site, O(7) is bonded in a 2-coordinate geometry to two equivalent Cs(1), one Cr(1), and one As(2) atom. In the fourth O site, O(1) is bonded in a bent 150 degrees geometry to one Cs(1), one Cr(1), and one As(1) atom. In the fifth O site, O(2) is bonded in a 2-coordinate geometry to two equivalent Cs(1), one Cr(1), and one As(1) atom. In the sixth O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Cs(1), one Cr(1), and one As(1) atom. In the seventh O site, O(4) is bonded in a bent 120 degrees geometry to one Cs(1), one As(1), and one As(2) atom. is represented by the CIF file [CIF]
data_CsCrAs2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.116
_cell_length_b   7.937
_cell_length_c   8.692
_cell_angle_alpha   74.102
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   671.178
_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
  Cs  Cs0  1  0.196  0.679  0.456  1.0
  Cs  Cs1  1  0.696  0.321  0.044  1.0
  Cs  Cs2  1  0.804  0.321  0.544  1.0
  Cs  Cs3  1  0.304  0.679  0.956  1.0
  Cr  Cr4  1  0.399  0.261  0.767  1.0
  Cr  Cr5  1  0.899  0.739  0.733  1.0
  Cr  Cr6  1  0.601  0.739  0.233  1.0
  Cr  Cr7  1  0.101  0.261  0.267  1.0
  As  As8  1  0.132  0.069  0.686  1.0
  As  As9  1  0.632  0.931  0.814  1.0
  As  As10  1  0.868  0.931  0.314  1.0
  As  As11  1  0.368  0.069  0.186  1.0
  As  As12  1  0.089  0.364  0.841  1.0
  As  As13  1  0.589  0.636  0.659  1.0
  As  As14  1  0.911  0.636  0.159  1.0
  As  As15  1  0.411  0.364  0.341  1.0
  O  O16  1  0.105  0.205  0.504  1.0
  O  O17  1  0.605  0.795  0.996  1.0
  O  O18  1  0.895  0.795  0.496  1.0
  O  O19  1  0.395  0.205  0.004  1.0
  O  O20  1  0.076  0.864  0.718  1.0
  O  O21  1  0.576  0.136  0.782  1.0
  O  O22  1  0.924  0.136  0.282  1.0
  O  O23  1  0.424  0.864  0.218  1.0
  O  O24  1  0.290  0.058  0.753  1.0
  O  O25  1  0.790  0.942  0.747  1.0
  O  O26  1  0.710  0.942  0.247  1.0
  O  O27  1  0.210  0.058  0.253  1.0
  O  O28  1  0.036  0.162  0.814  1.0
  O  O29  1  0.536  0.838  0.686  1.0
  O  O30  1  0.964  0.838  0.186  1.0
  O  O31  1  0.464  0.162  0.314  1.0
  O  O32  1  0.080  0.348  0.035  1.0
  O  O33  1  0.580  0.652  0.465  1.0
  O  O34  1  0.920  0.652  0.965  1.0
  O  O35  1  0.420  0.348  0.535  1.0
  O  O36  1  0.992  0.517  0.723  1.0
  O  O37  1  0.492  0.483  0.777  1.0
  O  O38  1  0.008  0.483  0.277  1.0
  O  O39  1  0.508  0.517  0.223  1.0
  O  O40  1  0.241  0.403  0.758  1.0
  O  O41  1  0.741  0.597  0.742  1.0
  O  O42  1  0.759  0.597  0.242  1.0
  O  O43  1  0.259  0.403  0.258  1.0
[/CIF]
.