The structure described by MgCr2O5 crystallizes in the orthorhombic Cmcm space group. Mg(1) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. Cr(1) is bonded to one O(1), one O(3), and three equivalent O(2) atoms to form a mixture of distorted edge and corner-sharing CrO5 trigonal bipyramids. There are three inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Mg(1) and two equivalent Cr(1) atoms to form OMg2Cr2 tetrahedra that share corners with two equivalent O(1)Mg2Cr2 tetrahedra, corners with two equivalent O(2)MgCr3 trigonal pyramids, and edges with four equivalent O(2)MgCr3 trigonal pyramids. In the second O site, O(2) is bonded to one Mg(1) and three equivalent Cr(1) atoms to form distorted OMgCr3 trigonal pyramids that share  a cornercorner with one O(1)Mg2Cr2 tetrahedra, corners with three equivalent O(2)MgCr3 trigonal pyramids, edges with two equivalent O(1)Mg2Cr2 tetrahedra, and edges with two equivalent O(2)MgCr3 trigonal pyramids. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Mg(1) and one Cr(1) atom. is represented by the CIF file [CIF]
data_MgCr2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.700
_cell_length_b   5.364
_cell_length_c   11.244
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   110.178
_symmetry_Int_Tables_number   1
_cell_volume   209.489
_cell_formula_units_Z   2
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  0.893  0.786  0.750  1.0
  Mg  Mg1  1  0.107  0.214  0.250  1.0
  Cr  Cr2  1  0.208  0.416  0.597  1.0
  Cr  Cr3  1  0.792  0.584  0.403  1.0
  Cr  Cr4  1  0.792  0.584  0.097  1.0
  Cr  Cr5  1  0.208  0.416  0.903  1.0
  O  O6  1  0.699  0.399  0.250  1.0
  O  O7  1  0.301  0.601  0.750  1.0
  O  O8  1  0.232  0.464  0.078  1.0
  O  O9  1  0.768  0.536  0.922  1.0
  O  O10  1  0.768  0.536  0.578  1.0
  O  O11  1  0.232  0.464  0.422  1.0
  O  O12  1  0.045  0.090  0.634  1.0
  O  O13  1  0.955  0.910  0.366  1.0
  O  O14  1  0.045  0.090  0.866  1.0
  O  O15  1  0.955  0.910  0.134  1.0
[/CIF]
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The structure described by MgCr2O5 crystallizes in the orthorhombic Cmcm space group. Mg(1) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. Cr(1) is bonded to one O(1), one O(3), and three equivalent O(2) atoms to form a mixture of distorted edge and corner-sharing CrO5 trigonal bipyramids. There are three inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Mg(1) and two equivalent Cr(1) atoms to form OMg2Cr2 tetrahedra that share corners with two equivalent O(1)Mg2Cr2 tetrahedra, corners with two equivalent O(2)MgCr3 trigonal pyramids, and edges with four equivalent O(2)MgCr3 trigonal pyramids. In the second O site, O(2) is bonded to one Mg(1) and three equivalent Cr(1) atoms to form distorted OMgCr3 trigonal pyramids that share  a cornercorner with one O(1)Mg2Cr2 tetrahedra, corners with three equivalent O(2)MgCr3 trigonal pyramids, edges with two equivalent O(1)Mg2Cr2 tetrahedra, and edges with two equivalent O(2)MgCr3 trigonal pyramids. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Mg(1) and one Cr(1) atom. is represented by the CIF file [CIF]
data_MgCr2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.700
_cell_length_b   5.364
_cell_length_c   11.244
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   110.178
_symmetry_Int_Tables_number   1
_cell_volume   209.489
_cell_formula_units_Z   2
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  0.893  0.786  0.750  1.0
  Mg  Mg1  1  0.107  0.214  0.250  1.0
  Cr  Cr2  1  0.208  0.416  0.597  1.0
  Cr  Cr3  1  0.792  0.584  0.403  1.0
  Cr  Cr4  1  0.792  0.584  0.097  1.0
  Cr  Cr5  1  0.208  0.416  0.903  1.0
  O  O6  1  0.699  0.399  0.250  1.0
  O  O7  1  0.301  0.601  0.750  1.0
  O  O8  1  0.232  0.464  0.078  1.0
  O  O9  1  0.768  0.536  0.922  1.0
  O  O10  1  0.768  0.536  0.578  1.0
  O  O11  1  0.232  0.464  0.422  1.0
  O  O12  1  0.045  0.090  0.634  1.0
  O  O13  1  0.955  0.910  0.366  1.0
  O  O14  1  0.045  0.090  0.866  1.0
  O  O15  1  0.955  0.910  0.134  1.0
[/CIF]
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