The compound described by MgCr2(Fe2O5)2 crystallizes in the orthorhombic Amm2 space group. Mg(1) is bonded in a 7-coordinate geometry to one O(4), two equivalent O(1), and four equivalent O(2) atoms. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form CrO6 octahedra that share corners with two equivalent Cr(1)O6 octahedra, corners with two equivalent Fe(2)O6 octahedra, corners with two equivalent Fe(1)O5 trigonal bipyramids, and edges with four equivalent Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 11-21°. In the second Cr site, Cr(2) is bonded to two equivalent O(3), two equivalent O(5), and two equivalent O(6) atoms to form distorted CrO6 octahedra that share corners with two equivalent Cr(2)O6 octahedra, corners with two equivalent Fe(1)O5 trigonal bipyramids, edges with two equivalent Fe(2)O6 octahedra, and edges with four equivalent Fe(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 37°. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(2), one O(3), one O(5), and two equivalent O(6) atoms to form distorted FeO5 trigonal bipyramids that share  a cornercorner with one Cr(1)O6 octahedra,  a cornercorner with one Cr(2)O6 octahedra, corners with two equivalent Fe(2)O6 octahedra, corners with three equivalent Fe(1)O5 trigonal bipyramids,  an edgeedge with one Fe(2)O6 octahedra, and edges with two equivalent Cr(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 28-74°. In the second Fe site, Fe(2) is bonded to one O(2), one O(4), one O(5), one O(6), and two equivalent O(1) atoms to form distorted FeO6 octahedra that share  a cornercorner with one Cr(1)O6 octahedra, corners with three equivalent Fe(2)O6 octahedra, corners with two equivalent Fe(1)O5 trigonal bipyramids,  an edgeedge with one Cr(2)O6 octahedra, edges with two equivalent Cr(1)O6 octahedra, and  an edgeedge with one Fe(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 21-68°. There are six inequivalent O sites. In the first O site, O(1) is bonded to one Mg(1), one Cr(1), and two equivalent Fe(2) atoms to form OMgCrFe2 trigonal pyramids that share  a cornercorner with one O(4)MgCr2Fe2 trigonal bipyramid, corners with four equivalent O(2)Mg2CrFe2 trigonal bipyramids, corners with two equivalent O(6)CrFe3 trigonal pyramids, corners with two equivalent O(1)MgCrFe2 trigonal pyramids, edges with two equivalent O(2)Mg2CrFe2 trigonal bipyramids, edges with two equivalent O(4)MgCr2Fe2 trigonal bipyramids, and  an edgeedge with one O(1)MgCrFe2 trigonal pyramid. In the second O site, O(2) is bonded to two equivalent Mg(1), one Cr(1), one Fe(1), and one Fe(2) atom to form OMg2CrFe2 trigonal bipyramids that share  a cornercorner with one O(3)Cr2Fe2 tetrahedra,  a cornercorner with one O(4)MgCr2Fe2 trigonal bipyramid, corners with four equivalent O(2)Mg2CrFe2 trigonal bipyramids, corners with three equivalent O(6)CrFe3 trigonal pyramids, corners with four equivalent O(1)MgCrFe2 trigonal pyramids, edges with two equivalent O(4)MgCr2Fe2 trigonal bipyramids, edges with two equivalent O(1)MgCrFe2 trigonal pyramids, and  a faceface with one O(2)Mg2CrFe2 trigonal bipyramid. In the third O site, O(3) is bonded to two equivalent Cr(2) and two equivalent Fe(1) atoms to form distorted OCr2Fe2 tetrahedra that share corners with two equivalent O(3)Cr2Fe2 tetrahedra, corners with two equivalent O(2)Mg2CrFe2 trigonal bipyramids, and edges with four equivalent O(6)CrFe3 trigonal pyramids. In the fourth O site, O(4) is bonded to one Mg(1), two equivalent Cr(1), and two equivalent Fe(2) atoms to form OMgCr2Fe2 trigonal bipyramids that share corners with two equivalent O(2)Mg2CrFe2 trigonal bipyramids, corners with two equivalent O(4)MgCr2Fe2 trigonal bipyramids, corners with two equivalent O(6)CrFe3 trigonal pyramids, corners with two equivalent O(1)MgCrFe2 trigonal pyramids, edges with four equivalent O(2)Mg2CrFe2 trigonal bipyramids, and edges with four equivalent O(1)MgCrFe2 trigonal pyramids. In the fifth O site, O(5) is bonded in a distorted T-shaped geometry to one Cr(2), one Fe(1), and one Fe(2) atom. In the sixth O site, O(6) is bonded to one Cr(2), one Fe(2), and two equivalent Fe(1) atoms to form OCrFe3 trigonal pyramids that share  a cornercorner with one O(4)MgCr2Fe2 trigonal bipyramid, corners with three equivalent O(2)Mg2CrFe2 trigonal bipyramids, corners with two equivalent O(1)MgCrFe2 trigonal pyramids, corners with three equivalent O(6)CrFe3 trigonal pyramids, and edges with two equivalent O(3)Cr2Fe2 tetrahedra. is represented by the CIF file [CIF]
data_MgCr2(Fe2O5)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.874
_cell_length_b   5.386
_cell_length_c   9.949
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   111.075
_symmetry_Int_Tables_number   1
_cell_volume   193.710
_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  0.509  0.017  0.250  1.0
  Cr  Cr1  1  0.206  0.411  0.250  1.0
  Cr  Cr2  1  0.797  0.594  0.750  1.0
  Fe  Fe3  1  0.124  0.247  0.571  1.0
  Fe  Fe4  1  0.124  0.247  0.929  1.0
  Fe  Fe5  1  0.855  0.710  0.444  1.0
  Fe  Fe6  1  0.855  0.710  0.056  1.0
  O  O7  1  0.346  0.693  0.392  1.0
  O  O8  1  0.346  0.693  0.108  1.0
  O  O9  1  0.051  0.102  0.121  1.0
  O  O10  1  0.051  0.102  0.379  1.0
  O  O11  1  0.234  0.467  0.750  1.0
  O  O12  1  0.724  0.448  0.250  1.0
  O  O13  1  0.942  0.885  0.617  1.0
  O  O14  1  0.688  0.376  0.567  1.0
  O  O15  1  0.688  0.376  0.933  1.0
  O  O16  1  0.942  0.885  0.883  1.0
[/CIF]
.
The compound described by MgCr2(Fe2O5)2 crystallizes in the orthorhombic Amm2 space group. Mg(1) is bonded in a 7-coordinate geometry to one O(4), two equivalent O(1), and four equivalent O(2) atoms. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form CrO6 octahedra that share corners with two equivalent Cr(1)O6 octahedra, corners with two equivalent Fe(2)O6 octahedra, corners with two equivalent Fe(1)O5 trigonal bipyramids, and edges with four equivalent Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 11-21°. In the second Cr site, Cr(2) is bonded to two equivalent O(3), two equivalent O(5), and two equivalent O(6) atoms to form distorted CrO6 octahedra that share corners with two equivalent Cr(2)O6 octahedra, corners with two equivalent Fe(1)O5 trigonal bipyramids, edges with two equivalent Fe(2)O6 octahedra, and edges with four equivalent Fe(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 37°. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(2), one O(3), one O(5), and two equivalent O(6) atoms to form distorted FeO5 trigonal bipyramids that share  a cornercorner with one Cr(1)O6 octahedra,  a cornercorner with one Cr(2)O6 octahedra, corners with two equivalent Fe(2)O6 octahedra, corners with three equivalent Fe(1)O5 trigonal bipyramids,  an edgeedge with one Fe(2)O6 octahedra, and edges with two equivalent Cr(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 28-74°. In the second Fe site, Fe(2) is bonded to one O(2), one O(4), one O(5), one O(6), and two equivalent O(1) atoms to form distorted FeO6 octahedra that share  a cornercorner with one Cr(1)O6 octahedra, corners with three equivalent Fe(2)O6 octahedra, corners with two equivalent Fe(1)O5 trigonal bipyramids,  an edgeedge with one Cr(2)O6 octahedra, edges with two equivalent Cr(1)O6 octahedra, and  an edgeedge with one Fe(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 21-68°. There are six inequivalent O sites. In the first O site, O(1) is bonded to one Mg(1), one Cr(1), and two equivalent Fe(2) atoms to form OMgCrFe2 trigonal pyramids that share  a cornercorner with one O(4)MgCr2Fe2 trigonal bipyramid, corners with four equivalent O(2)Mg2CrFe2 trigonal bipyramids, corners with two equivalent O(6)CrFe3 trigonal pyramids, corners with two equivalent O(1)MgCrFe2 trigonal pyramids, edges with two equivalent O(2)Mg2CrFe2 trigonal bipyramids, edges with two equivalent O(4)MgCr2Fe2 trigonal bipyramids, and  an edgeedge with one O(1)MgCrFe2 trigonal pyramid. In the second O site, O(2) is bonded to two equivalent Mg(1), one Cr(1), one Fe(1), and one Fe(2) atom to form OMg2CrFe2 trigonal bipyramids that share  a cornercorner with one O(3)Cr2Fe2 tetrahedra,  a cornercorner with one O(4)MgCr2Fe2 trigonal bipyramid, corners with four equivalent O(2)Mg2CrFe2 trigonal bipyramids, corners with three equivalent O(6)CrFe3 trigonal pyramids, corners with four equivalent O(1)MgCrFe2 trigonal pyramids, edges with two equivalent O(4)MgCr2Fe2 trigonal bipyramids, edges with two equivalent O(1)MgCrFe2 trigonal pyramids, and  a faceface with one O(2)Mg2CrFe2 trigonal bipyramid. In the third O site, O(3) is bonded to two equivalent Cr(2) and two equivalent Fe(1) atoms to form distorted OCr2Fe2 tetrahedra that share corners with two equivalent O(3)Cr2Fe2 tetrahedra, corners with two equivalent O(2)Mg2CrFe2 trigonal bipyramids, and edges with four equivalent O(6)CrFe3 trigonal pyramids. In the fourth O site, O(4) is bonded to one Mg(1), two equivalent Cr(1), and two equivalent Fe(2) atoms to form OMgCr2Fe2 trigonal bipyramids that share corners with two equivalent O(2)Mg2CrFe2 trigonal bipyramids, corners with two equivalent O(4)MgCr2Fe2 trigonal bipyramids, corners with two equivalent O(6)CrFe3 trigonal pyramids, corners with two equivalent O(1)MgCrFe2 trigonal pyramids, edges with four equivalent O(2)Mg2CrFe2 trigonal bipyramids, and edges with four equivalent O(1)MgCrFe2 trigonal pyramids. In the fifth O site, O(5) is bonded in a distorted T-shaped geometry to one Cr(2), one Fe(1), and one Fe(2) atom. In the sixth O site, O(6) is bonded to one Cr(2), one Fe(2), and two equivalent Fe(1) atoms to form OCrFe3 trigonal pyramids that share  a cornercorner with one O(4)MgCr2Fe2 trigonal bipyramid, corners with three equivalent O(2)Mg2CrFe2 trigonal bipyramids, corners with two equivalent O(1)MgCrFe2 trigonal pyramids, corners with three equivalent O(6)CrFe3 trigonal pyramids, and edges with two equivalent O(3)Cr2Fe2 tetrahedra. is represented by the CIF file [CIF]
data_MgCr2(Fe2O5)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.874
_cell_length_b   5.386
_cell_length_c   9.949
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   111.075
_symmetry_Int_Tables_number   1
_cell_volume   193.710
_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  0.509  0.017  0.250  1.0
  Cr  Cr1  1  0.206  0.411  0.250  1.0
  Cr  Cr2  1  0.797  0.594  0.750  1.0
  Fe  Fe3  1  0.124  0.247  0.571  1.0
  Fe  Fe4  1  0.124  0.247  0.929  1.0
  Fe  Fe5  1  0.855  0.710  0.444  1.0
  Fe  Fe6  1  0.855  0.710  0.056  1.0
  O  O7  1  0.346  0.693  0.392  1.0
  O  O8  1  0.346  0.693  0.108  1.0
  O  O9  1  0.051  0.102  0.121  1.0
  O  O10  1  0.051  0.102  0.379  1.0
  O  O11  1  0.234  0.467  0.750  1.0
  O  O12  1  0.724  0.448  0.250  1.0
  O  O13  1  0.942  0.885  0.617  1.0
  O  O14  1  0.688  0.376  0.567  1.0
  O  O15  1  0.688  0.376  0.933  1.0
  O  O16  1  0.942  0.885  0.883  1.0
[/CIF]
.