The crystal structure described by MgCr2(BiO4)2 crystallizes in the monoclinic C2 space group. Mg(1) is bonded in a 4-coordinate geometry to two equivalent O(1) and two equivalent O(4) atoms. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded in a distorted trigonal pyramidal geometry to two equivalent O(1) and two equivalent O(2) atoms. In the second Cr site, Cr(2) is bonded in a tetrahedral geometry to two equivalent O(3) and two equivalent O(4) atoms. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. In the second Bi site, Bi(2) is bonded in a 4-coordinate geometry to two equivalent O(1) and two equivalent O(3) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Mg(1), one Cr(1), one Bi(1), and one Bi(2) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to one Cr(1) and one Bi(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Cr(2), one Bi(1), and one Bi(2) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to one Mg(1), one Cr(2), and one Bi(1) atom. is represented by the CIF file [CIF]
data_MgCr2(BiO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.410
_cell_length_b   6.362
_cell_length_c   6.286
_cell_angle_alpha   105.304
_cell_angle_beta   105.650
_cell_angle_gamma   118.341
_symmetry_Int_Tables_number   1
_cell_volume   192.625
_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  0.617  0.867  0.234  1.0
  Cr  Cr1  1  0.354  0.604  0.707  1.0
  Cr  Cr2  1  0.618  0.368  0.237  1.0
  Bi  Bi3  1  0.138  0.888  0.277  1.0
  Bi  Bi4  1  0.915  0.165  0.829  1.0
  O  O5  1  0.238  0.626  0.950  1.0
  O  O6  1  0.371  0.793  0.541  1.0
  O  O7  1  0.170  0.248  0.541  1.0
  O  O8  1  0.712  0.825  0.950  1.0
  O  O9  1  0.262  0.191  0.074  1.0
  O  O10  1  0.786  0.727  0.407  1.0
  O  O11  1  0.622  0.180  0.407  1.0
  O  O12  1  0.812  0.383  0.074  1.0
[/CIF]
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The crystal structure described by MgCr2(BiO4)2 crystallizes in the monoclinic C2 space group. Mg(1) is bonded in a 4-coordinate geometry to two equivalent O(1) and two equivalent O(4) atoms. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded in a distorted trigonal pyramidal geometry to two equivalent O(1) and two equivalent O(2) atoms. In the second Cr site, Cr(2) is bonded in a tetrahedral geometry to two equivalent O(3) and two equivalent O(4) atoms. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. In the second Bi site, Bi(2) is bonded in a 4-coordinate geometry to two equivalent O(1) and two equivalent O(3) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Mg(1), one Cr(1), one Bi(1), and one Bi(2) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to one Cr(1) and one Bi(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Cr(2), one Bi(1), and one Bi(2) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to one Mg(1), one Cr(2), and one Bi(1) atom. is represented by the CIF file [CIF]
data_MgCr2(BiO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.410
_cell_length_b   6.362
_cell_length_c   6.286
_cell_angle_alpha   105.304
_cell_angle_beta   105.650
_cell_angle_gamma   118.341
_symmetry_Int_Tables_number   1
_cell_volume   192.625
_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  0.617  0.867  0.234  1.0
  Cr  Cr1  1  0.354  0.604  0.707  1.0
  Cr  Cr2  1  0.618  0.368  0.237  1.0
  Bi  Bi3  1  0.138  0.888  0.277  1.0
  Bi  Bi4  1  0.915  0.165  0.829  1.0
  O  O5  1  0.238  0.626  0.950  1.0
  O  O6  1  0.371  0.793  0.541  1.0
  O  O7  1  0.170  0.248  0.541  1.0
  O  O8  1  0.712  0.825  0.950  1.0
  O  O9  1  0.262  0.191  0.074  1.0
  O  O10  1  0.786  0.727  0.407  1.0
  O  O11  1  0.622  0.180  0.407  1.0
  O  O12  1  0.812  0.383  0.074  1.0
[/CIF]
.