The crystal structure described by MgCr2(WO4)2 crystallizes in the triclinic P-1 space group. Mg(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form MgO6 octahedra that share corners with four equivalent W(1)O6 octahedra, edges with four equivalent Cr(1)O6 octahedra, and faces with two equivalent W(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 49-50°. W(1) is bonded to one O(3), one O(4), two equivalent O(1), and two equivalent O(2) atoms to form WO6 octahedra that share corners with two equivalent Mg(1)O6 octahedra, corners with eight equivalent Cr(1)O6 octahedra, edges with two equivalent W(1)O6 octahedra, and  a faceface with one Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 42-57°. Cr(1) is bonded to one O(1), one O(2), two equivalent O(3), and two equivalent O(4) atoms to form CrO6 octahedra that share corners with eight equivalent W(1)O6 octahedra, edges with two equivalent Mg(1)O6 octahedra, and edges with two equivalent Cr(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 42-57°. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted see-saw-like geometry to one Mg(1), two equivalent W(1), and one Cr(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Mg(1), two equivalent W(1), and one Cr(1) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one W(1) and two equivalent Cr(1) atoms. In the fourth O site, O(4) is bonded to one Mg(1), one W(1), and two equivalent Cr(1) atoms to form a mixture of distorted edge and corner-sharing OMgCr2W trigonal pyramids. is represented by the CIF card [CIF]
data_MgCr2(WO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.881
_cell_length_b   5.848
_cell_length_c   5.752
_cell_angle_alpha   64.577
_cell_angle_beta   88.648
_cell_angle_gamma   88.252
_symmetry_Int_Tables_number   1
_cell_volume   148.195
_cell_formula_units_Z   1
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
  Mg  Mg0  1  1.000  0.990  0.510  1.0
  Cr  Cr1  1  0.499  0.238  0.260  1.0
  Cr  Cr2  1  0.501  0.742  0.759  1.0
  W  W3  1  0.004  0.716  0.234  1.0
  W  W4  1  0.996  0.264  0.784  1.0
  O  O5  1  0.169  0.627  0.602  1.0
  O  O6  1  0.831  0.353  0.416  1.0
  O  O7  1  0.826  0.889  0.878  1.0
  O  O8  1  0.174  0.091  0.140  1.0
  O  O9  1  0.678  0.395  0.909  1.0
  O  O10  1  0.320  0.101  0.622  1.0
  O  O11  1  0.322  0.585  0.109  1.0
  O  O12  1  0.681  0.879  0.396  1.0
[/CIF]
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The crystal structure described by MgCr2(WO4)2 crystallizes in the triclinic P-1 space group. Mg(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form MgO6 octahedra that share corners with four equivalent W(1)O6 octahedra, edges with four equivalent Cr(1)O6 octahedra, and faces with two equivalent W(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 49-50°. W(1) is bonded to one O(3), one O(4), two equivalent O(1), and two equivalent O(2) atoms to form WO6 octahedra that share corners with two equivalent Mg(1)O6 octahedra, corners with eight equivalent Cr(1)O6 octahedra, edges with two equivalent W(1)O6 octahedra, and  a faceface with one Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 42-57°. Cr(1) is bonded to one O(1), one O(2), two equivalent O(3), and two equivalent O(4) atoms to form CrO6 octahedra that share corners with eight equivalent W(1)O6 octahedra, edges with two equivalent Mg(1)O6 octahedra, and edges with two equivalent Cr(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 42-57°. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted see-saw-like geometry to one Mg(1), two equivalent W(1), and one Cr(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Mg(1), two equivalent W(1), and one Cr(1) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one W(1) and two equivalent Cr(1) atoms. In the fourth O site, O(4) is bonded to one Mg(1), one W(1), and two equivalent Cr(1) atoms to form a mixture of distorted edge and corner-sharing OMgCr2W trigonal pyramids. is represented by the CIF card [CIF]
data_MgCr2(WO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.881
_cell_length_b   5.848
_cell_length_c   5.752
_cell_angle_alpha   64.577
_cell_angle_beta   88.648
_cell_angle_gamma   88.252
_symmetry_Int_Tables_number   1
_cell_volume   148.195
_cell_formula_units_Z   1
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
  Mg  Mg0  1  1.000  0.990  0.510  1.0
  Cr  Cr1  1  0.499  0.238  0.260  1.0
  Cr  Cr2  1  0.501  0.742  0.759  1.0
  W  W3  1  0.004  0.716  0.234  1.0
  W  W4  1  0.996  0.264  0.784  1.0
  O  O5  1  0.169  0.627  0.602  1.0
  O  O6  1  0.831  0.353  0.416  1.0
  O  O7  1  0.826  0.889  0.878  1.0
  O  O8  1  0.174  0.091  0.140  1.0
  O  O9  1  0.678  0.395  0.909  1.0
  O  O10  1  0.320  0.101  0.622  1.0
  O  O11  1  0.322  0.585  0.109  1.0
  O  O12  1  0.681  0.879  0.396  1.0
[/CIF]
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