The material structure described by Mg2Fe7O12 is Spinel-like structured and crystallizes in the monoclinic C2/c space group. Mg(1) is bonded to one O(2), one O(3), one O(4), one O(6), and two equivalent O(5) atoms to form MgO6 octahedra that share corners with two equivalent Fe(1)O4 tetrahedra, corners with four equivalent Fe(2)O4 tetrahedra,  an edgeedge with one Mg(1)O6 octahedra,  an edgeedge with one Fe(3)O6 octahedra,  an edgeedge with one Fe(5)O6 octahedra, and edges with three equivalent Fe(4)O6 octahedra. There are five inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to two equivalent O(3) and two equivalent O(6) atoms to form FeO4 tetrahedra that share corners with two equivalent Fe(3)O6 octahedra, corners with two equivalent Fe(5)O6 octahedra, corners with four equivalent Mg(1)O6 octahedra, and corners with four equivalent Fe(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 55-59°. In the second Fe site, Fe(2) is bonded to one O(1), one O(2), one O(4), and one O(5) atom to form FeO4 tetrahedra that share corners with two equivalent Fe(3)O6 octahedra, corners with two equivalent Fe(5)O6 octahedra, corners with four equivalent Mg(1)O6 octahedra, and corners with four equivalent Fe(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 55-58°. In the third Fe site, Fe(3) is bonded to two equivalent O(1), two equivalent O(4), and two equivalent O(6) atoms to form FeO6 octahedra that share corners with two equivalent Fe(1)O4 tetrahedra, corners with four equivalent Fe(2)O4 tetrahedra, edges with two equivalent Mg(1)O6 octahedra, edges with two equivalent Fe(4)O6 octahedra, and edges with two equivalent Fe(5)O6 octahedra. In the fourth Fe site, Fe(4) is bonded to one O(1), one O(3), one O(5), one O(6), and two equivalent O(2) atoms to form FeO6 octahedra that share corners with two equivalent Fe(1)O4 tetrahedra, corners with four equivalent Fe(2)O4 tetrahedra,  an edgeedge with one Fe(3)O6 octahedra,  an edgeedge with one Fe(4)O6 octahedra,  an edgeedge with one Fe(5)O6 octahedra, and edges with three equivalent Mg(1)O6 octahedra. In the fifth Fe site, Fe(5) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form FeO6 octahedra that share corners with two equivalent Fe(1)O4 tetrahedra, corners with four equivalent Fe(2)O4 tetrahedra, edges with two equivalent Mg(1)O6 octahedra, edges with two equivalent Fe(3)O6 octahedra, and edges with two equivalent Fe(4)O6 octahedra. There are six inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to one Fe(2), one Fe(3), one Fe(4), and one Fe(5) atom. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Fe(2), and two equivalent Fe(4) atoms. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Fe(1), one Fe(4), and one Fe(5) atom. In the fourth O site, O(4) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Fe(2), one Fe(3), and one Fe(5) atom. In the fifth O site, O(5) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Mg(1), one Fe(2), and one Fe(4) atom. In the sixth O site, O(6) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Fe(1), one Fe(3), and one Fe(4) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Mg2Fe7O12
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.042
_cell_length_b   6.042
_cell_length_c   13.508
_cell_angle_alpha   77.162
_cell_angle_beta   77.162
_cell_angle_gamma   89.775
_symmetry_Int_Tables_number   1
_cell_volume   468.166
_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  0.167  0.666  0.666  1.0
  Mg  Mg1  1  0.833  0.334  0.334  1.0
  Mg  Mg2  1  0.666  0.167  0.166  1.0
  Mg  Mg3  1  0.334  0.833  0.834  1.0
  Fe  Fe4  1  0.628  0.372  0.750  1.0
  Fe  Fe5  1  0.299  0.038  0.415  1.0
  Fe  Fe6  1  0.962  0.701  0.085  1.0
  Fe  Fe7  1  0.372  0.628  0.250  1.0
  Fe  Fe8  1  0.038  0.299  0.915  1.0
  Fe  Fe9  1  0.701  0.962  0.585  1.0
  Fe  Fe10  1  0.500  0.000  0.000  1.0
  Fe  Fe11  1  0.168  0.165  0.667  1.0
  Fe  Fe12  1  0.832  0.835  0.333  1.0
  Fe  Fe13  1  0.500  0.500  0.000  1.0
  Fe  Fe14  1  0.000  0.500  0.500  1.0
  Fe  Fe15  1  0.500  0.500  0.500  1.0
  Fe  Fe16  1  0.165  0.168  0.167  1.0
  Fe  Fe17  1  0.835  0.832  0.833  1.0
  O  O18  1  0.254  0.255  0.505  1.0
  O  O19  1  0.919  0.926  0.172  1.0
  O  O20  1  0.585  0.593  0.839  1.0
  O  O21  1  0.259  0.738  0.503  1.0
  O  O22  1  0.919  0.398  0.171  1.0
  O  O23  1  0.588  0.067  0.834  1.0
  O  O24  1  0.407  0.415  0.661  1.0
  O  O25  1  0.074  0.081  0.328  1.0
  O  O26  1  0.745  0.746  0.995  1.0
  O  O27  1  0.933  0.412  0.666  1.0
  O  O28  1  0.602  0.081  0.329  1.0
  O  O29  1  0.262  0.741  0.997  1.0
  O  O30  1  0.746  0.745  0.495  1.0
  O  O31  1  0.415  0.407  0.161  1.0
  O  O32  1  0.081  0.074  0.828  1.0
  O  O33  1  0.741  0.262  0.497  1.0
  O  O34  1  0.412  0.933  0.166  1.0
  O  O35  1  0.081  0.602  0.829  1.0
  O  O36  1  0.593  0.585  0.339  1.0
  O  O37  1  0.255  0.254  0.005  1.0
  O  O38  1  0.926  0.919  0.672  1.0
  O  O39  1  0.067  0.588  0.334  1.0
  O  O40  1  0.738  0.259  0.003  1.0
  O  O41  1  0.398  0.919  0.671  1.0
[/CIF]
.
The material structure described by Mg2Fe7O12 is Spinel-like structured and crystallizes in the monoclinic C2/c space group. Mg(1) is bonded to one O(2), one O(3), one O(4), one O(6), and two equivalent O(5) atoms to form MgO6 octahedra that share corners with two equivalent Fe(1)O4 tetrahedra, corners with four equivalent Fe(2)O4 tetrahedra,  an edgeedge with one Mg(1)O6 octahedra,  an edgeedge with one Fe(3)O6 octahedra,  an edgeedge with one Fe(5)O6 octahedra, and edges with three equivalent Fe(4)O6 octahedra. There are five inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to two equivalent O(3) and two equivalent O(6) atoms to form FeO4 tetrahedra that share corners with two equivalent Fe(3)O6 octahedra, corners with two equivalent Fe(5)O6 octahedra, corners with four equivalent Mg(1)O6 octahedra, and corners with four equivalent Fe(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 55-59°. In the second Fe site, Fe(2) is bonded to one O(1), one O(2), one O(4), and one O(5) atom to form FeO4 tetrahedra that share corners with two equivalent Fe(3)O6 octahedra, corners with two equivalent Fe(5)O6 octahedra, corners with four equivalent Mg(1)O6 octahedra, and corners with four equivalent Fe(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 55-58°. In the third Fe site, Fe(3) is bonded to two equivalent O(1), two equivalent O(4), and two equivalent O(6) atoms to form FeO6 octahedra that share corners with two equivalent Fe(1)O4 tetrahedra, corners with four equivalent Fe(2)O4 tetrahedra, edges with two equivalent Mg(1)O6 octahedra, edges with two equivalent Fe(4)O6 octahedra, and edges with two equivalent Fe(5)O6 octahedra. In the fourth Fe site, Fe(4) is bonded to one O(1), one O(3), one O(5), one O(6), and two equivalent O(2) atoms to form FeO6 octahedra that share corners with two equivalent Fe(1)O4 tetrahedra, corners with four equivalent Fe(2)O4 tetrahedra,  an edgeedge with one Fe(3)O6 octahedra,  an edgeedge with one Fe(4)O6 octahedra,  an edgeedge with one Fe(5)O6 octahedra, and edges with three equivalent Mg(1)O6 octahedra. In the fifth Fe site, Fe(5) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form FeO6 octahedra that share corners with two equivalent Fe(1)O4 tetrahedra, corners with four equivalent Fe(2)O4 tetrahedra, edges with two equivalent Mg(1)O6 octahedra, edges with two equivalent Fe(3)O6 octahedra, and edges with two equivalent Fe(4)O6 octahedra. There are six inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to one Fe(2), one Fe(3), one Fe(4), and one Fe(5) atom. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Fe(2), and two equivalent Fe(4) atoms. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Fe(1), one Fe(4), and one Fe(5) atom. In the fourth O site, O(4) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Fe(2), one Fe(3), and one Fe(5) atom. In the fifth O site, O(5) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Mg(1), one Fe(2), and one Fe(4) atom. In the sixth O site, O(6) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Fe(1), one Fe(3), and one Fe(4) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Mg2Fe7O12
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.042
_cell_length_b   6.042
_cell_length_c   13.508
_cell_angle_alpha   77.162
_cell_angle_beta   77.162
_cell_angle_gamma   89.775
_symmetry_Int_Tables_number   1
_cell_volume   468.166
_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  0.167  0.666  0.666  1.0
  Mg  Mg1  1  0.833  0.334  0.334  1.0
  Mg  Mg2  1  0.666  0.167  0.166  1.0
  Mg  Mg3  1  0.334  0.833  0.834  1.0
  Fe  Fe4  1  0.628  0.372  0.750  1.0
  Fe  Fe5  1  0.299  0.038  0.415  1.0
  Fe  Fe6  1  0.962  0.701  0.085  1.0
  Fe  Fe7  1  0.372  0.628  0.250  1.0
  Fe  Fe8  1  0.038  0.299  0.915  1.0
  Fe  Fe9  1  0.701  0.962  0.585  1.0
  Fe  Fe10  1  0.500  0.000  0.000  1.0
  Fe  Fe11  1  0.168  0.165  0.667  1.0
  Fe  Fe12  1  0.832  0.835  0.333  1.0
  Fe  Fe13  1  0.500  0.500  0.000  1.0
  Fe  Fe14  1  0.000  0.500  0.500  1.0
  Fe  Fe15  1  0.500  0.500  0.500  1.0
  Fe  Fe16  1  0.165  0.168  0.167  1.0
  Fe  Fe17  1  0.835  0.832  0.833  1.0
  O  O18  1  0.254  0.255  0.505  1.0
  O  O19  1  0.919  0.926  0.172  1.0
  O  O20  1  0.585  0.593  0.839  1.0
  O  O21  1  0.259  0.738  0.503  1.0
  O  O22  1  0.919  0.398  0.171  1.0
  O  O23  1  0.588  0.067  0.834  1.0
  O  O24  1  0.407  0.415  0.661  1.0
  O  O25  1  0.074  0.081  0.328  1.0
  O  O26  1  0.745  0.746  0.995  1.0
  O  O27  1  0.933  0.412  0.666  1.0
  O  O28  1  0.602  0.081  0.329  1.0
  O  O29  1  0.262  0.741  0.997  1.0
  O  O30  1  0.746  0.745  0.495  1.0
  O  O31  1  0.415  0.407  0.161  1.0
  O  O32  1  0.081  0.074  0.828  1.0
  O  O33  1  0.741  0.262  0.497  1.0
  O  O34  1  0.412  0.933  0.166  1.0
  O  O35  1  0.081  0.602  0.829  1.0
  O  O36  1  0.593  0.585  0.339  1.0
  O  O37  1  0.255  0.254  0.005  1.0
  O  O38  1  0.926  0.919  0.672  1.0
  O  O39  1  0.067  0.588  0.334  1.0
  O  O40  1  0.738  0.259  0.003  1.0
  O  O41  1  0.398  0.919  0.671  1.0
[/CIF]
.