The material structure described by Mg2Cr2O5 is Aluminum carbonitride-like structured and crystallizes in the orthorhombic Pbam 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), two equivalent O(2), and two equivalent O(3) atoms to form corner-sharing CrO5 trigonal bipyramids. There are three inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Mg(1) and two equivalent Cr(1) atoms to form distorted OMg4Cr2 octahedra that share corners with eight equivalent O(2)Mg2Cr2 tetrahedra, corners with four equivalent O(3)Mg2Cr2 trigonal pyramids, edges with two equivalent O(1)Mg4Cr2 octahedra, edges with two equivalent O(2)Mg2Cr2 tetrahedra, and edges with four equivalent O(3)Mg2Cr2 trigonal pyramids. In the second O site, O(2) is bonded to two equivalent Mg(1) and two equivalent Cr(1) atoms to form OMg2Cr2 tetrahedra that share corners with four equivalent O(1)Mg4Cr2 octahedra, corners with four equivalent O(2)Mg2Cr2 tetrahedra, corners with four equivalent O(3)Mg2Cr2 trigonal pyramids,  an edgeedge with one O(1)Mg4Cr2 octahedra, and edges with two equivalent O(3)Mg2Cr2 trigonal pyramids. The corner-sharing octahedral tilt angles range from 18-60°. In the third O site, O(3) is bonded to two equivalent Mg(1) and two equivalent Cr(1) atoms to form distorted OMg2Cr2 trigonal pyramids that share corners with two equivalent O(1)Mg4Cr2 octahedra, corners with four equivalent O(2)Mg2Cr2 tetrahedra, corners with two equivalent O(3)Mg2Cr2 trigonal pyramids, edges with two equivalent O(1)Mg4Cr2 octahedra, edges with two equivalent O(2)Mg2Cr2 tetrahedra, and  an edgeedge with one O(3)Mg2Cr2 trigonal pyramid. The corner-sharing octahedral tilt angles are 58°. is represented by the CIF file [CIF]
data_Mg2Cr2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.770
_cell_length_b   5.045
_cell_length_c   10.564
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   200.953
_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  0.500  0.257  0.904  1.0
  Mg  Mg1  1  0.500  0.743  0.096  1.0
  Mg  Mg2  1  0.500  0.757  0.596  1.0
  Mg  Mg3  1  0.500  0.243  0.404  1.0
  Cr  Cr4  1  0.000  0.236  0.638  1.0
  Cr  Cr5  1  0.000  0.764  0.362  1.0
  Cr  Cr6  1  0.000  0.264  0.138  1.0
  Cr  Cr7  1  0.000  0.736  0.862  1.0
  O  O8  1  0.000  0.500  0.500  1.0
  O  O9  1  0.000  0.147  0.312  1.0
  O  O10  1  0.000  0.647  0.188  1.0
  O  O11  1  0.000  0.353  0.812  1.0
  O  O12  1  0.500  0.311  0.100  1.0
  O  O13  1  0.500  0.689  0.900  1.0
  O  O14  1  0.000  0.853  0.688  1.0
  O  O15  1  0.500  0.189  0.600  1.0
  O  O16  1  0.000  0.000  0.000  1.0
  O  O17  1  0.500  0.811  0.400  1.0
[/CIF]
.
The material structure described by Mg2Cr2O5 is Aluminum carbonitride-like structured and crystallizes in the orthorhombic Pbam 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), two equivalent O(2), and two equivalent O(3) atoms to form corner-sharing CrO5 trigonal bipyramids. There are three inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Mg(1) and two equivalent Cr(1) atoms to form distorted OMg4Cr2 octahedra that share corners with eight equivalent O(2)Mg2Cr2 tetrahedra, corners with four equivalent O(3)Mg2Cr2 trigonal pyramids, edges with two equivalent O(1)Mg4Cr2 octahedra, edges with two equivalent O(2)Mg2Cr2 tetrahedra, and edges with four equivalent O(3)Mg2Cr2 trigonal pyramids. In the second O site, O(2) is bonded to two equivalent Mg(1) and two equivalent Cr(1) atoms to form OMg2Cr2 tetrahedra that share corners with four equivalent O(1)Mg4Cr2 octahedra, corners with four equivalent O(2)Mg2Cr2 tetrahedra, corners with four equivalent O(3)Mg2Cr2 trigonal pyramids,  an edgeedge with one O(1)Mg4Cr2 octahedra, and edges with two equivalent O(3)Mg2Cr2 trigonal pyramids. The corner-sharing octahedral tilt angles range from 18-60°. In the third O site, O(3) is bonded to two equivalent Mg(1) and two equivalent Cr(1) atoms to form distorted OMg2Cr2 trigonal pyramids that share corners with two equivalent O(1)Mg4Cr2 octahedra, corners with four equivalent O(2)Mg2Cr2 tetrahedra, corners with two equivalent O(3)Mg2Cr2 trigonal pyramids, edges with two equivalent O(1)Mg4Cr2 octahedra, edges with two equivalent O(2)Mg2Cr2 tetrahedra, and  an edgeedge with one O(3)Mg2Cr2 trigonal pyramid. The corner-sharing octahedral tilt angles are 58°. is represented by the CIF file [CIF]
data_Mg2Cr2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.770
_cell_length_b   5.045
_cell_length_c   10.564
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   200.953
_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  0.500  0.257  0.904  1.0
  Mg  Mg1  1  0.500  0.743  0.096  1.0
  Mg  Mg2  1  0.500  0.757  0.596  1.0
  Mg  Mg3  1  0.500  0.243  0.404  1.0
  Cr  Cr4  1  0.000  0.236  0.638  1.0
  Cr  Cr5  1  0.000  0.764  0.362  1.0
  Cr  Cr6  1  0.000  0.264  0.138  1.0
  Cr  Cr7  1  0.000  0.736  0.862  1.0
  O  O8  1  0.000  0.500  0.500  1.0
  O  O9  1  0.000  0.147  0.312  1.0
  O  O10  1  0.000  0.647  0.188  1.0
  O  O11  1  0.000  0.353  0.812  1.0
  O  O12  1  0.500  0.311  0.100  1.0
  O  O13  1  0.500  0.689  0.900  1.0
  O  O14  1  0.000  0.853  0.688  1.0
  O  O15  1  0.500  0.189  0.600  1.0
  O  O16  1  0.000  0.000  0.000  1.0
  O  O17  1  0.500  0.811  0.400  1.0
[/CIF]
.