The crystal structure described by Cr2Zn(PO4)2 crystallizes in the monoclinic C2/c space group. There are three inequivalent Cr sites. In the first Cr site, Cr(1) is bonded in a 4-coordinate geometry to one O(2), one O(4), one O(6), and one O(7) atom. In the second Cr site, Cr(2) is bonded in a square co-planar geometry to two equivalent O(1) and two equivalent O(4) atoms. In the third Cr site, Cr(3) is bonded to two equivalent O(5), two equivalent O(6), and two equivalent O(7) atoms to form distorted CrO6 pentagonal pyramids that share corners with two equivalent P(1)O4 tetrahedra and corners with four equivalent P(2)O4 tetrahedra. Zn(1) is bonded in a 4-coordinate geometry to one O(2), one O(3), one O(6), and one O(8) atom. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(4), one O(7), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Cr(3)O6 pentagonal pyramid. In the second P site, P(2) is bonded to one O(2), one O(3), one O(5), and one O(6) atom to form PO4 tetrahedra that share corners with two equivalent Cr(3)O6 pentagonal pyramids. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Cr(2) and one P(1) atom. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to one Cr(1), one Zn(1), and one P(2) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to one Zn(1) and one P(2) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Cr(1), one Cr(2), and one P(1) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Cr(3) and one P(2) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Cr(1), one Cr(3), one Zn(1), and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Cr(1), one Cr(3), and one P(1) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one Zn(1) and one P(1) atom. is represented by the CIF card [CIF]
data_ZnCr2(PO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.392
_cell_length_b   9.392
_cell_length_c   16.311
_cell_angle_alpha   60.273
_cell_angle_beta   60.273
_cell_angle_gamma   31.556
_symmetry_Int_Tables_number   1
_cell_volume   645.232
_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
  Zn  Zn0  1  0.164  0.571  0.126  1.0
  Zn  Zn1  1  0.429  0.836  0.374  1.0
  Zn  Zn2  1  0.571  0.164  0.626  1.0
  Zn  Zn3  1  0.836  0.429  0.874  1.0
  Cr  Cr4  1  0.363  0.843  0.029  1.0
  Cr  Cr5  1  0.157  0.637  0.471  1.0
  Cr  Cr6  1  0.637  0.157  0.971  1.0
  Cr  Cr7  1  0.000  0.500  0.000  1.0
  Cr  Cr8  1  0.843  0.363  0.529  1.0
  Cr  Cr9  1  0.690  0.310  0.750  1.0
  Cr  Cr10  1  0.310  0.690  0.250  1.0
  Cr  Cr11  1  0.500  0.000  0.500  1.0
  P  P12  1  0.490  0.934  0.142  1.0
  P  P13  1  0.802  0.230  0.393  1.0
  P  P14  1  0.510  0.066  0.858  1.0
  P  P15  1  0.230  0.802  0.893  1.0
  P  P16  1  0.934  0.490  0.642  1.0
  P  P17  1  0.066  0.510  0.358  1.0
  P  P18  1  0.198  0.770  0.607  1.0
  P  P19  1  0.770  0.198  0.107  1.0
  O  O20  1  0.195  0.298  0.893  1.0
  O  O21  1  0.609  0.219  0.084  1.0
  O  O22  1  0.298  0.195  0.393  1.0
  O  O23  1  0.663  0.181  0.480  1.0
  O  O24  1  0.649  0.803  0.938  1.0
  O  O25  1  0.670  0.397  0.306  1.0
  O  O26  1  0.819  0.337  0.020  1.0
  O  O27  1  0.927  0.117  0.878  1.0
  O  O28  1  0.337  0.819  0.520  1.0
  O  O29  1  0.781  0.391  0.416  1.0
  O  O30  1  0.618  0.133  0.857  1.0
  O  O31  1  0.993  0.410  0.738  1.0
  O  O32  1  0.391  0.781  0.916  1.0
  O  O33  1  0.117  0.927  0.378  1.0
  O  O34  1  0.805  0.702  0.107  1.0
  O  O35  1  0.382  0.867  0.143  1.0
  O  O36  1  0.410  0.993  0.238  1.0
  O  O37  1  0.181  0.663  0.980  1.0
  O  O38  1  0.133  0.618  0.357  1.0
  O  O39  1  0.007  0.590  0.262  1.0
  O  O40  1  0.883  0.073  0.622  1.0
  O  O41  1  0.803  0.649  0.438  1.0
  O  O42  1  0.073  0.883  0.122  1.0
  O  O43  1  0.397  0.670  0.806  1.0
  O  O44  1  0.219  0.609  0.584  1.0
  O  O45  1  0.702  0.805  0.607  1.0
  O  O46  1  0.590  0.007  0.762  1.0
  O  O47  1  0.197  0.351  0.562  1.0
  O  O48  1  0.351  0.197  0.062  1.0
  O  O49  1  0.603  0.330  0.194  1.0
  O  O50  1  0.330  0.603  0.694  1.0
  O  O51  1  0.867  0.382  0.643  1.0
[/CIF]
.
The crystal structure described by Cr2Zn(PO4)2 crystallizes in the monoclinic C2/c space group. There are three inequivalent Cr sites. In the first Cr site, Cr(1) is bonded in a 4-coordinate geometry to one O(2), one O(4), one O(6), and one O(7) atom. In the second Cr site, Cr(2) is bonded in a square co-planar geometry to two equivalent O(1) and two equivalent O(4) atoms. In the third Cr site, Cr(3) is bonded to two equivalent O(5), two equivalent O(6), and two equivalent O(7) atoms to form distorted CrO6 pentagonal pyramids that share corners with two equivalent P(1)O4 tetrahedra and corners with four equivalent P(2)O4 tetrahedra. Zn(1) is bonded in a 4-coordinate geometry to one O(2), one O(3), one O(6), and one O(8) atom. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(4), one O(7), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Cr(3)O6 pentagonal pyramid. In the second P site, P(2) is bonded to one O(2), one O(3), one O(5), and one O(6) atom to form PO4 tetrahedra that share corners with two equivalent Cr(3)O6 pentagonal pyramids. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Cr(2) and one P(1) atom. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to one Cr(1), one Zn(1), and one P(2) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to one Zn(1) and one P(2) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Cr(1), one Cr(2), and one P(1) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Cr(3) and one P(2) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Cr(1), one Cr(3), one Zn(1), and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Cr(1), one Cr(3), and one P(1) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one Zn(1) and one P(1) atom. is represented by the CIF card [CIF]
data_ZnCr2(PO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.392
_cell_length_b   9.392
_cell_length_c   16.311
_cell_angle_alpha   60.273
_cell_angle_beta   60.273
_cell_angle_gamma   31.556
_symmetry_Int_Tables_number   1
_cell_volume   645.232
_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
  Zn  Zn0  1  0.164  0.571  0.126  1.0
  Zn  Zn1  1  0.429  0.836  0.374  1.0
  Zn  Zn2  1  0.571  0.164  0.626  1.0
  Zn  Zn3  1  0.836  0.429  0.874  1.0
  Cr  Cr4  1  0.363  0.843  0.029  1.0
  Cr  Cr5  1  0.157  0.637  0.471  1.0
  Cr  Cr6  1  0.637  0.157  0.971  1.0
  Cr  Cr7  1  0.000  0.500  0.000  1.0
  Cr  Cr8  1  0.843  0.363  0.529  1.0
  Cr  Cr9  1  0.690  0.310  0.750  1.0
  Cr  Cr10  1  0.310  0.690  0.250  1.0
  Cr  Cr11  1  0.500  0.000  0.500  1.0
  P  P12  1  0.490  0.934  0.142  1.0
  P  P13  1  0.802  0.230  0.393  1.0
  P  P14  1  0.510  0.066  0.858  1.0
  P  P15  1  0.230  0.802  0.893  1.0
  P  P16  1  0.934  0.490  0.642  1.0
  P  P17  1  0.066  0.510  0.358  1.0
  P  P18  1  0.198  0.770  0.607  1.0
  P  P19  1  0.770  0.198  0.107  1.0
  O  O20  1  0.195  0.298  0.893  1.0
  O  O21  1  0.609  0.219  0.084  1.0
  O  O22  1  0.298  0.195  0.393  1.0
  O  O23  1  0.663  0.181  0.480  1.0
  O  O24  1  0.649  0.803  0.938  1.0
  O  O25  1  0.670  0.397  0.306  1.0
  O  O26  1  0.819  0.337  0.020  1.0
  O  O27  1  0.927  0.117  0.878  1.0
  O  O28  1  0.337  0.819  0.520  1.0
  O  O29  1  0.781  0.391  0.416  1.0
  O  O30  1  0.618  0.133  0.857  1.0
  O  O31  1  0.993  0.410  0.738  1.0
  O  O32  1  0.391  0.781  0.916  1.0
  O  O33  1  0.117  0.927  0.378  1.0
  O  O34  1  0.805  0.702  0.107  1.0
  O  O35  1  0.382  0.867  0.143  1.0
  O  O36  1  0.410  0.993  0.238  1.0
  O  O37  1  0.181  0.663  0.980  1.0
  O  O38  1  0.133  0.618  0.357  1.0
  O  O39  1  0.007  0.590  0.262  1.0
  O  O40  1  0.883  0.073  0.622  1.0
  O  O41  1  0.803  0.649  0.438  1.0
  O  O42  1  0.073  0.883  0.122  1.0
  O  O43  1  0.397  0.670  0.806  1.0
  O  O44  1  0.219  0.609  0.584  1.0
  O  O45  1  0.702  0.805  0.607  1.0
  O  O46  1  0.590  0.007  0.762  1.0
  O  O47  1  0.197  0.351  0.562  1.0
  O  O48  1  0.351  0.197  0.062  1.0
  O  O49  1  0.603  0.330  0.194  1.0
  O  O50  1  0.330  0.603  0.694  1.0
  O  O51  1  0.867  0.382  0.643  1.0
[/CIF]
.