The crystal structure described by MgFe4O5F3 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(2), one O(3), one O(4), one O(5), one F(1), and one F(2) atom to form MgO4F2 octahedra that share corners with two equivalent Fe(1)O4F trigonal bipyramids, edges with two equivalent Fe(3)O3F3 octahedra, edges with two equivalent Fe(4)O3F3 octahedra, and  an edgeedge with one Fe(1)O4F trigonal bipyramid. There are four 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 one F(3) atom to form distorted FeO4F trigonal bipyramids that share corners with two equivalent Mg(1)O4F2 octahedra, corners with three equivalent Fe(3)O3F3 octahedra, corners with three equivalent Fe(4)O3F3 octahedra, and  an edgeedge with one Mg(1)O4F2 octahedra. The corner-sharing octahedral tilt angles range from 43-64°. In the second Fe site, Fe(2) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(3), one O(4), and one O(5) atom. In the third Fe site, Fe(3) is bonded to one O(1), one O(2), one O(4), one F(1), one F(2), and one F(3) atom to form FeO3F3 octahedra that share corners with three equivalent Fe(1)O4F trigonal bipyramids, edges with two equivalent Mg(1)O4F2 octahedra, and edges with two equivalent Fe(4)O3F3 octahedra. In the fourth Fe site, Fe(4) is bonded to one O(1), one O(3), one O(5), one F(1), one F(2), and one F(3) atom to form FeO3F3 octahedra that share corners with three equivalent Fe(1)O4F trigonal bipyramids, edges with two equivalent Mg(1)O4F2 octahedra, and edges with two equivalent Fe(3)O3F3 octahedra. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Fe(2), one Fe(3), and one Fe(4) atom. In the second O site, O(2) is bonded to one Mg(1), one Fe(1), one Fe(2), and one Fe(3) atom to form a mixture of corner and edge-sharing OMgFe3 trigonal pyramids. In the third O site, O(3) is bonded to one Mg(1), one Fe(1), one Fe(2), and one Fe(4) atom to form a mixture of corner and edge-sharing OMgFe3 trigonal pyramids. In the fourth O site, O(4) is bonded to one Mg(1), one Fe(1), one Fe(2), and one Fe(3) atom to form a mixture of corner and edge-sharing OMgFe3 trigonal pyramids. In the fifth O site, O(5) is bonded to one Mg(1), one Fe(1), one Fe(2), and one Fe(4) atom to form a mixture of corner and edge-sharing OMgFe3 trigonal pyramids. There are three inequivalent F sites. In the first F site, F(1) is bonded in a distorted T-shaped geometry to one Mg(1), one Fe(3), and one Fe(4) atom. In the second F site, F(2) is bonded in a distorted T-shaped geometry to one Mg(1), one Fe(3), and one Fe(4) atom. In the third F site, F(3) is bonded in a distorted T-shaped geometry to one Fe(1), one Fe(3), and one Fe(4) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_MgFe4O5F3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.023
_cell_length_b   6.035
_cell_length_c   5.776
_cell_angle_alpha   65.948
_cell_angle_beta   94.761
_cell_angle_gamma   58.298
_symmetry_Int_Tables_number   1
_cell_volume   150.697
_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  0.500  0.009  1.0
  Fe  Fe1  1  0.672  0.765  0.433  1.0
  Fe  Fe2  1  0.323  0.251  0.583  1.0
  Fe  Fe3  1  0.493  0.502  0.993  1.0
  Fe  Fe4  1  0.952  0.034  0.977  1.0
  O  O5  1  0.559  0.297  0.766  1.0
  O  O6  1  0.572  0.794  0.751  1.0
  O  O7  1  0.024  0.330  0.747  1.0
  O  O8  1  0.419  0.218  0.259  1.0
  O  O9  1  0.957  0.689  0.257  1.0
  F  F10  1  0.049  0.810  0.778  1.0
  F  F11  1  0.938  0.198  0.231  1.0
  F  F12  1  0.415  0.743  0.215  1.0
[/CIF]
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The crystal structure described by MgFe4O5F3 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(2), one O(3), one O(4), one O(5), one F(1), and one F(2) atom to form MgO4F2 octahedra that share corners with two equivalent Fe(1)O4F trigonal bipyramids, edges with two equivalent Fe(3)O3F3 octahedra, edges with two equivalent Fe(4)O3F3 octahedra, and  an edgeedge with one Fe(1)O4F trigonal bipyramid. There are four 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 one F(3) atom to form distorted FeO4F trigonal bipyramids that share corners with two equivalent Mg(1)O4F2 octahedra, corners with three equivalent Fe(3)O3F3 octahedra, corners with three equivalent Fe(4)O3F3 octahedra, and  an edgeedge with one Mg(1)O4F2 octahedra. The corner-sharing octahedral tilt angles range from 43-64°. In the second Fe site, Fe(2) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(3), one O(4), and one O(5) atom. In the third Fe site, Fe(3) is bonded to one O(1), one O(2), one O(4), one F(1), one F(2), and one F(3) atom to form FeO3F3 octahedra that share corners with three equivalent Fe(1)O4F trigonal bipyramids, edges with two equivalent Mg(1)O4F2 octahedra, and edges with two equivalent Fe(4)O3F3 octahedra. In the fourth Fe site, Fe(4) is bonded to one O(1), one O(3), one O(5), one F(1), one F(2), and one F(3) atom to form FeO3F3 octahedra that share corners with three equivalent Fe(1)O4F trigonal bipyramids, edges with two equivalent Mg(1)O4F2 octahedra, and edges with two equivalent Fe(3)O3F3 octahedra. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Fe(2), one Fe(3), and one Fe(4) atom. In the second O site, O(2) is bonded to one Mg(1), one Fe(1), one Fe(2), and one Fe(3) atom to form a mixture of corner and edge-sharing OMgFe3 trigonal pyramids. In the third O site, O(3) is bonded to one Mg(1), one Fe(1), one Fe(2), and one Fe(4) atom to form a mixture of corner and edge-sharing OMgFe3 trigonal pyramids. In the fourth O site, O(4) is bonded to one Mg(1), one Fe(1), one Fe(2), and one Fe(3) atom to form a mixture of corner and edge-sharing OMgFe3 trigonal pyramids. In the fifth O site, O(5) is bonded to one Mg(1), one Fe(1), one Fe(2), and one Fe(4) atom to form a mixture of corner and edge-sharing OMgFe3 trigonal pyramids. There are three inequivalent F sites. In the first F site, F(1) is bonded in a distorted T-shaped geometry to one Mg(1), one Fe(3), and one Fe(4) atom. In the second F site, F(2) is bonded in a distorted T-shaped geometry to one Mg(1), one Fe(3), and one Fe(4) atom. In the third F site, F(3) is bonded in a distorted T-shaped geometry to one Fe(1), one Fe(3), and one Fe(4) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_MgFe4O5F3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.023
_cell_length_b   6.035
_cell_length_c   5.776
_cell_angle_alpha   65.948
_cell_angle_beta   94.761
_cell_angle_gamma   58.298
_symmetry_Int_Tables_number   1
_cell_volume   150.697
_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  0.500  0.009  1.0
  Fe  Fe1  1  0.672  0.765  0.433  1.0
  Fe  Fe2  1  0.323  0.251  0.583  1.0
  Fe  Fe3  1  0.493  0.502  0.993  1.0
  Fe  Fe4  1  0.952  0.034  0.977  1.0
  O  O5  1  0.559  0.297  0.766  1.0
  O  O6  1  0.572  0.794  0.751  1.0
  O  O7  1  0.024  0.330  0.747  1.0
  O  O8  1  0.419  0.218  0.259  1.0
  O  O9  1  0.957  0.689  0.257  1.0
  F  F10  1  0.049  0.810  0.778  1.0
  F  F11  1  0.938  0.198  0.231  1.0
  F  F12  1  0.415  0.743  0.215  1.0
[/CIF]
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