The compound described by Mg3Fe2O5 is Caswellsilverite-like structured and crystallizes in the monoclinic Cm space group. There are three inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to one O(1), one O(3), one O(4), one O(5), and two equivalent O(2) atoms to form MgO6 octahedra that share  a cornercorner with one Mg(2)O6 octahedra,  a cornercorner with one Mg(3)O6 octahedra,  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(2)O6 octahedra, corners with two equivalent Mg(1)O6 octahedra, edges with three equivalent Mg(2)O6 octahedra, edges with three equivalent Mg(3)O6 octahedra, edges with three equivalent Fe(1)O6 octahedra, and edges with three equivalent Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 2-5°. In the second Mg site, Mg(2) is bonded to one O(1), one O(2), one O(3), one O(5), and two equivalent O(4) atoms to form MgO6 octahedra that share  a cornercorner with one Mg(1)O6 octahedra,  a cornercorner with one Mg(3)O6 octahedra,  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(2)O6 octahedra, corners with two equivalent Mg(2)O6 octahedra, edges with three equivalent Mg(1)O6 octahedra, edges with three equivalent Mg(3)O6 octahedra, edges with three equivalent Fe(1)O6 octahedra, and edges with three equivalent Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 1-6°. In the third Mg site, Mg(3) is bonded to one O(1), one O(2), one O(3), one O(4), and two equivalent O(5) atoms to form MgO6 octahedra that share  a cornercorner with one Mg(1)O6 octahedra,  a cornercorner with one Mg(2)O6 octahedra,  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(2)O6 octahedra, corners with two equivalent Mg(3)O6 octahedra, edges with three equivalent Mg(1)O6 octahedra, edges with three equivalent Mg(2)O6 octahedra, edges with three equivalent Fe(1)O6 octahedra, and edges with three equivalent Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 2-6°. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(2), one O(3), one O(4), one O(5), and two equivalent O(1) atoms to form FeO6 octahedra that share  a cornercorner with one Mg(1)O6 octahedra,  a cornercorner with one Mg(2)O6 octahedra,  a cornercorner with one Mg(3)O6 octahedra,  a cornercorner with one Fe(2)O6 octahedra, corners with two equivalent Fe(1)O6 octahedra, edges with three equivalent Mg(1)O6 octahedra, edges with three equivalent Mg(2)O6 octahedra, edges with three equivalent Mg(3)O6 octahedra, and edges with three equivalent Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 1-5°. In the second Fe site, Fe(2) is bonded to one O(1), one O(2), one O(4), one O(5), and two equivalent O(3) atoms to form FeO6 octahedra that share  a cornercorner with one Mg(1)O6 octahedra,  a cornercorner with one Mg(2)O6 octahedra,  a cornercorner with one Mg(3)O6 octahedra,  a cornercorner with one Fe(1)O6 octahedra, corners with two equivalent Fe(2)O6 octahedra, edges with three equivalent Mg(1)O6 octahedra, edges with three equivalent Mg(2)O6 octahedra, edges with three equivalent Mg(3)O6 octahedra, and edges with three equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 1-6°. There are five inequivalent O sites. In the first O site, O(1) is bonded to one Mg(1), one Mg(2), one Mg(3), one Fe(2), and two equivalent Fe(1) atoms to form OMg3Fe3 octahedra that share  a cornercorner with one O(3)Mg3Fe3 octahedra,  a cornercorner with one O(2)Mg4Fe2 octahedra,  a cornercorner with one O(4)Mg4Fe2 octahedra,  a cornercorner with one O(5)Mg4Fe2 octahedra, corners with two equivalent O(1)Mg3Fe3 octahedra, edges with three equivalent O(3)Mg3Fe3 octahedra, edges with three equivalent O(2)Mg4Fe2 octahedra, edges with three equivalent O(4)Mg4Fe2 octahedra, and edges with three equivalent O(5)Mg4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 1-6°. In the second O site, O(2) is bonded to one Mg(2), one Mg(3), two equivalent Mg(1), one Fe(1), and one Fe(2) atom to form OMg4Fe2 octahedra that share  a cornercorner with one O(1)Mg3Fe3 octahedra,  a cornercorner with one O(3)Mg3Fe3 octahedra,  a cornercorner with one O(4)Mg4Fe2 octahedra,  a cornercorner with one O(5)Mg4Fe2 octahedra, corners with two equivalent O(2)Mg4Fe2 octahedra, edges with three equivalent O(1)Mg3Fe3 octahedra, edges with three equivalent O(3)Mg3Fe3 octahedra, edges with three equivalent O(4)Mg4Fe2 octahedra, and edges with three equivalent O(5)Mg4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 0-6°. In the third O site, O(3) is bonded to one Mg(1), one Mg(2), one Mg(3), one Fe(1), and two equivalent Fe(2) atoms to form OMg3Fe3 octahedra that share  a cornercorner with one O(1)Mg3Fe3 octahedra,  a cornercorner with one O(2)Mg4Fe2 octahedra,  a cornercorner with one O(4)Mg4Fe2 octahedra,  a cornercorner with one O(5)Mg4Fe2 octahedra, corners with two equivalent O(3)Mg3Fe3 octahedra, edges with three equivalent O(1)Mg3Fe3 octahedra, edges with three equivalent O(2)Mg4Fe2 octahedra, edges with three equivalent O(4)Mg4Fe2 octahedra, and edges with three equivalent O(5)Mg4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 1-6°. In the fourth O site, O(4) is bonded to one Mg(1), one Mg(3), two equivalent Mg(2), one Fe(1), and one Fe(2) atom to form OMg4Fe2 octahedra that share  a cornercorner with one O(1)Mg3Fe3 octahedra,  a cornercorner with one O(3)Mg3Fe3 octahedra,  a cornercorner with one O(2)Mg4Fe2 octahedra,  a cornercorner with one O(5)Mg4Fe2 octahedra, corners with two equivalent O(4)Mg4Fe2 octahedra, edges with three equivalent O(1)Mg3Fe3 octahedra, edges with three equivalent O(3)Mg3Fe3 octahedra, edges with three equivalent O(2)Mg4Fe2 octahedra, and edges with three equivalent O(5)Mg4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. In the fifth O site, O(5) is bonded to one Mg(1), one Mg(2), two equivalent Mg(3), one Fe(1), and one Fe(2) atom to form OMg4Fe2 octahedra that share  a cornercorner with one O(1)Mg3Fe3 octahedra,  a cornercorner with one O(3)Mg3Fe3 octahedra,  a cornercorner with one O(2)Mg4Fe2 octahedra,  a cornercorner with one O(4)Mg4Fe2 octahedra, corners with two equivalent O(5)Mg4Fe2 octahedra, edges with three equivalent O(1)Mg3Fe3 octahedra, edges with three equivalent O(3)Mg3Fe3 octahedra, edges with three equivalent O(2)Mg4Fe2 octahedra, and edges with three equivalent O(4)Mg4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 2-5°. is represented by the CIF card [CIF]
data_Mg3Fe2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.209
_cell_length_b   4.215
_cell_length_c   5.199
_cell_angle_alpha   66.067
_cell_angle_beta   79.647
_cell_angle_gamma   66.136
_symmetry_Int_Tables_number   1
_cell_volume   95.398
_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  0.996  0.002  0.999  1.0
  Mg  Mg1  1  0.804  0.795  0.602  1.0
  Mg  Mg2  1  0.600  0.596  0.207  1.0
  Fe  Fe3  1  0.209  0.198  0.392  1.0
  Fe  Fe4  1  0.389  0.405  0.799  1.0
  O  O5  1  0.195  0.709  0.384  1.0
  O  O6  1  0.981  0.513  0.991  1.0
  O  O7  1  0.404  0.889  0.814  1.0
  O  O8  1  0.808  0.296  0.597  1.0
  O  O9  1  0.608  0.087  0.215  1.0
[/CIF]
.
The compound described by Mg3Fe2O5 is Caswellsilverite-like structured and crystallizes in the monoclinic Cm space group. There are three inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to one O(1), one O(3), one O(4), one O(5), and two equivalent O(2) atoms to form MgO6 octahedra that share  a cornercorner with one Mg(2)O6 octahedra,  a cornercorner with one Mg(3)O6 octahedra,  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(2)O6 octahedra, corners with two equivalent Mg(1)O6 octahedra, edges with three equivalent Mg(2)O6 octahedra, edges with three equivalent Mg(3)O6 octahedra, edges with three equivalent Fe(1)O6 octahedra, and edges with three equivalent Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 2-5°. In the second Mg site, Mg(2) is bonded to one O(1), one O(2), one O(3), one O(5), and two equivalent O(4) atoms to form MgO6 octahedra that share  a cornercorner with one Mg(1)O6 octahedra,  a cornercorner with one Mg(3)O6 octahedra,  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(2)O6 octahedra, corners with two equivalent Mg(2)O6 octahedra, edges with three equivalent Mg(1)O6 octahedra, edges with three equivalent Mg(3)O6 octahedra, edges with three equivalent Fe(1)O6 octahedra, and edges with three equivalent Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 1-6°. In the third Mg site, Mg(3) is bonded to one O(1), one O(2), one O(3), one O(4), and two equivalent O(5) atoms to form MgO6 octahedra that share  a cornercorner with one Mg(1)O6 octahedra,  a cornercorner with one Mg(2)O6 octahedra,  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(2)O6 octahedra, corners with two equivalent Mg(3)O6 octahedra, edges with three equivalent Mg(1)O6 octahedra, edges with three equivalent Mg(2)O6 octahedra, edges with three equivalent Fe(1)O6 octahedra, and edges with three equivalent Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 2-6°. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(2), one O(3), one O(4), one O(5), and two equivalent O(1) atoms to form FeO6 octahedra that share  a cornercorner with one Mg(1)O6 octahedra,  a cornercorner with one Mg(2)O6 octahedra,  a cornercorner with one Mg(3)O6 octahedra,  a cornercorner with one Fe(2)O6 octahedra, corners with two equivalent Fe(1)O6 octahedra, edges with three equivalent Mg(1)O6 octahedra, edges with three equivalent Mg(2)O6 octahedra, edges with three equivalent Mg(3)O6 octahedra, and edges with three equivalent Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 1-5°. In the second Fe site, Fe(2) is bonded to one O(1), one O(2), one O(4), one O(5), and two equivalent O(3) atoms to form FeO6 octahedra that share  a cornercorner with one Mg(1)O6 octahedra,  a cornercorner with one Mg(2)O6 octahedra,  a cornercorner with one Mg(3)O6 octahedra,  a cornercorner with one Fe(1)O6 octahedra, corners with two equivalent Fe(2)O6 octahedra, edges with three equivalent Mg(1)O6 octahedra, edges with three equivalent Mg(2)O6 octahedra, edges with three equivalent Mg(3)O6 octahedra, and edges with three equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 1-6°. There are five inequivalent O sites. In the first O site, O(1) is bonded to one Mg(1), one Mg(2), one Mg(3), one Fe(2), and two equivalent Fe(1) atoms to form OMg3Fe3 octahedra that share  a cornercorner with one O(3)Mg3Fe3 octahedra,  a cornercorner with one O(2)Mg4Fe2 octahedra,  a cornercorner with one O(4)Mg4Fe2 octahedra,  a cornercorner with one O(5)Mg4Fe2 octahedra, corners with two equivalent O(1)Mg3Fe3 octahedra, edges with three equivalent O(3)Mg3Fe3 octahedra, edges with three equivalent O(2)Mg4Fe2 octahedra, edges with three equivalent O(4)Mg4Fe2 octahedra, and edges with three equivalent O(5)Mg4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 1-6°. In the second O site, O(2) is bonded to one Mg(2), one Mg(3), two equivalent Mg(1), one Fe(1), and one Fe(2) atom to form OMg4Fe2 octahedra that share  a cornercorner with one O(1)Mg3Fe3 octahedra,  a cornercorner with one O(3)Mg3Fe3 octahedra,  a cornercorner with one O(4)Mg4Fe2 octahedra,  a cornercorner with one O(5)Mg4Fe2 octahedra, corners with two equivalent O(2)Mg4Fe2 octahedra, edges with three equivalent O(1)Mg3Fe3 octahedra, edges with three equivalent O(3)Mg3Fe3 octahedra, edges with three equivalent O(4)Mg4Fe2 octahedra, and edges with three equivalent O(5)Mg4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 0-6°. In the third O site, O(3) is bonded to one Mg(1), one Mg(2), one Mg(3), one Fe(1), and two equivalent Fe(2) atoms to form OMg3Fe3 octahedra that share  a cornercorner with one O(1)Mg3Fe3 octahedra,  a cornercorner with one O(2)Mg4Fe2 octahedra,  a cornercorner with one O(4)Mg4Fe2 octahedra,  a cornercorner with one O(5)Mg4Fe2 octahedra, corners with two equivalent O(3)Mg3Fe3 octahedra, edges with three equivalent O(1)Mg3Fe3 octahedra, edges with three equivalent O(2)Mg4Fe2 octahedra, edges with three equivalent O(4)Mg4Fe2 octahedra, and edges with three equivalent O(5)Mg4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 1-6°. In the fourth O site, O(4) is bonded to one Mg(1), one Mg(3), two equivalent Mg(2), one Fe(1), and one Fe(2) atom to form OMg4Fe2 octahedra that share  a cornercorner with one O(1)Mg3Fe3 octahedra,  a cornercorner with one O(3)Mg3Fe3 octahedra,  a cornercorner with one O(2)Mg4Fe2 octahedra,  a cornercorner with one O(5)Mg4Fe2 octahedra, corners with two equivalent O(4)Mg4Fe2 octahedra, edges with three equivalent O(1)Mg3Fe3 octahedra, edges with three equivalent O(3)Mg3Fe3 octahedra, edges with three equivalent O(2)Mg4Fe2 octahedra, and edges with three equivalent O(5)Mg4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. In the fifth O site, O(5) is bonded to one Mg(1), one Mg(2), two equivalent Mg(3), one Fe(1), and one Fe(2) atom to form OMg4Fe2 octahedra that share  a cornercorner with one O(1)Mg3Fe3 octahedra,  a cornercorner with one O(3)Mg3Fe3 octahedra,  a cornercorner with one O(2)Mg4Fe2 octahedra,  a cornercorner with one O(4)Mg4Fe2 octahedra, corners with two equivalent O(5)Mg4Fe2 octahedra, edges with three equivalent O(1)Mg3Fe3 octahedra, edges with three equivalent O(3)Mg3Fe3 octahedra, edges with three equivalent O(2)Mg4Fe2 octahedra, and edges with three equivalent O(4)Mg4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 2-5°. is represented by the CIF card [CIF]
data_Mg3Fe2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.209
_cell_length_b   4.215
_cell_length_c   5.199
_cell_angle_alpha   66.067
_cell_angle_beta   79.647
_cell_angle_gamma   66.136
_symmetry_Int_Tables_number   1
_cell_volume   95.398
_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  0.996  0.002  0.999  1.0
  Mg  Mg1  1  0.804  0.795  0.602  1.0
  Mg  Mg2  1  0.600  0.596  0.207  1.0
  Fe  Fe3  1  0.209  0.198  0.392  1.0
  Fe  Fe4  1  0.389  0.405  0.799  1.0
  O  O5  1  0.195  0.709  0.384  1.0
  O  O6  1  0.981  0.513  0.991  1.0
  O  O7  1  0.404  0.889  0.814  1.0
  O  O8  1  0.808  0.296  0.597  1.0
  O  O9  1  0.608  0.087  0.215  1.0
[/CIF]
.