The crystal structure described by MgFe6(O5F)2 crystallizes in the monoclinic Pm space group. Mg(1) is bonded to one O(1), two equivalent O(3), two equivalent O(5), and one F(1) atom to form MgO5F octahedra that share corners with two equivalent Fe(1)O4F2 octahedra, corners with two equivalent Fe(3)O5F octahedra, corners with two equivalent Fe(2)O5 square pyramids, corners with two equivalent Fe(5)O3F2 trigonal bipyramids, edges with two equivalent Mg(1)O5F octahedra,  a faceface with one Fe(1)O4F2 octahedra, and  a faceface with one Fe(3)O5F octahedra. The corner-sharing octahedral tilt angles range from 24-32°. There are six inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(1), one O(2), two equivalent O(5), and two equivalent F(2) atoms to form distorted FeO4F2 octahedra that share corners with two equivalent Mg(1)O5F octahedra, corners with two equivalent Fe(4)O5F octahedra, corners with four equivalent Fe(2)O5 square pyramids, edges with two equivalent Fe(1)O4F2 octahedra, and  a faceface with one Mg(1)O5F octahedra. The corner-sharing octahedral tilt angles range from 32-47°. In the second Fe site, Fe(2) is bonded to one O(9), two equivalent O(1), and two equivalent O(2) atoms to form distorted FeO5 square pyramids that share corners with two equivalent Mg(1)O5F octahedra, corners with two equivalent Fe(6)O6 octahedra, corners with four equivalent Fe(1)O4F2 octahedra, and edges with two equivalent Fe(2)O5 square pyramids. The corner-sharing octahedral tilt angles range from 49-65°. In the third Fe site, Fe(3) is bonded to one O(6), two equivalent O(3), two equivalent O(4), and one F(1) atom to form distorted FeO5F octahedra that share corners with two equivalent Mg(1)O5F octahedra, corners with two equivalent Fe(4)O5F octahedra, corners with four equivalent Fe(5)O3F2 trigonal bipyramids, edges with two equivalent Fe(3)O5F octahedra, and  a faceface with one Mg(1)O5F octahedra. The corner-sharing octahedral tilt angles range from 24-50°. In the fourth Fe site, Fe(4) is bonded to one O(4), two equivalent O(10), two equivalent O(7), and one F(2) atom to form FeO5F octahedra that share corners with two equivalent Fe(1)O4F2 octahedra, corners with two equivalent Fe(3)O5F octahedra, corners with four equivalent Fe(6)O6 octahedra, and edges with two equivalent Fe(4)O5F octahedra. The corner-sharing octahedral tilt angles range from 47-50°. In the fifth Fe site, Fe(5) is bonded to one O(8), two equivalent O(6), and two equivalent F(1) atoms to form distorted FeO3F2 trigonal bipyramids that share corners with two equivalent Mg(1)O5F octahedra, corners with two equivalent Fe(6)O6 octahedra, corners with four equivalent Fe(3)O5F octahedra, and edges with two equivalent Fe(5)O3F2 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 49-57°. In the sixth Fe site, Fe(6) is bonded to one O(10), one O(7), two equivalent O(8), and two equivalent O(9) atoms to form FeO6 octahedra that share corners with four equivalent Fe(4)O5F octahedra, corners with two equivalent Fe(2)O5 square pyramids, corners with two equivalent Fe(5)O3F2 trigonal bipyramids, and edges with two equivalent Fe(6)O6 octahedra. The corner-sharing octahedral tilt angles range from 49-50°. There are ten inequivalent O sites. In the first O site, O(1) is bonded to one Mg(1), one Fe(1), and two equivalent Fe(2) atoms to form distorted corner-sharing OMgFe3 tetrahedra. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Fe(1) and two equivalent Fe(2) atoms. In the third O site, O(3) is bonded in a rectangular see-saw-like geometry to two equivalent Mg(1) and two equivalent Fe(3) atoms. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Fe(4) and two equivalent Fe(3) atoms. In the fifth O site, O(5) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Mg(1) and two equivalent Fe(1) atoms. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one Fe(3) and two equivalent Fe(5) atoms. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Fe(6) and two equivalent Fe(4) atoms. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Fe(5) and two equivalent Fe(6) atoms. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Fe(2) and two equivalent Fe(6) atoms. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Fe(6) and two equivalent Fe(4) atoms. There are two inequivalent F sites. In the first F site, F(1) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Fe(3), and two equivalent Fe(5) atoms. In the second F site, F(2) is bonded in a 3-coordinate geometry to one Fe(4) and two equivalent Fe(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_MgFe6(O5F)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.795
_cell_length_b   6.729
_cell_length_c   2.924
_cell_angle_alpha   89.989
_cell_angle_beta   89.994
_cell_angle_gamma   75.941
_symmetry_Int_Tables_number   1
_cell_volume   225.092
_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  0.163  0.188  0.991  1.0
  Fe  Fe1  1  0.979  0.023  0.990  1.0
  Fe  Fe2  1  0.946  0.558  0.490  1.0
  Fe  Fe3  1  0.368  0.308  0.991  1.0
  Fe  Fe4  1  0.652  0.171  0.490  1.0
  Fe  Fe5  1  0.396  0.750  0.490  1.0
  Fe  Fe6  1  0.669  0.666  0.990  1.0
  O  O7  1  0.989  0.355  0.990  1.0
  O  O8  1  0.972  0.737  0.990  1.0
  O  O9  1  0.248  0.310  0.491  1.0
  O  O10  1  0.478  0.232  0.490  1.0
  O  O11  1  0.094  0.022  0.490  1.0
  O  O12  1  0.357  0.602  0.990  1.0
  O  O13  1  0.663  0.354  0.990  1.0
  O  O14  1  0.558  0.717  0.490  1.0
  O  O15  1  0.778  0.615  0.490  1.0
  O  O16  1  0.669  0.978  0.990  1.0
  F  F17  1  0.340  0.976  0.990  1.0
  F  F18  1  0.857  0.097  0.490  1.0
[/CIF]
.
The crystal structure described by MgFe6(O5F)2 crystallizes in the monoclinic Pm space group. Mg(1) is bonded to one O(1), two equivalent O(3), two equivalent O(5), and one F(1) atom to form MgO5F octahedra that share corners with two equivalent Fe(1)O4F2 octahedra, corners with two equivalent Fe(3)O5F octahedra, corners with two equivalent Fe(2)O5 square pyramids, corners with two equivalent Fe(5)O3F2 trigonal bipyramids, edges with two equivalent Mg(1)O5F octahedra,  a faceface with one Fe(1)O4F2 octahedra, and  a faceface with one Fe(3)O5F octahedra. The corner-sharing octahedral tilt angles range from 24-32°. There are six inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(1), one O(2), two equivalent O(5), and two equivalent F(2) atoms to form distorted FeO4F2 octahedra that share corners with two equivalent Mg(1)O5F octahedra, corners with two equivalent Fe(4)O5F octahedra, corners with four equivalent Fe(2)O5 square pyramids, edges with two equivalent Fe(1)O4F2 octahedra, and  a faceface with one Mg(1)O5F octahedra. The corner-sharing octahedral tilt angles range from 32-47°. In the second Fe site, Fe(2) is bonded to one O(9), two equivalent O(1), and two equivalent O(2) atoms to form distorted FeO5 square pyramids that share corners with two equivalent Mg(1)O5F octahedra, corners with two equivalent Fe(6)O6 octahedra, corners with four equivalent Fe(1)O4F2 octahedra, and edges with two equivalent Fe(2)O5 square pyramids. The corner-sharing octahedral tilt angles range from 49-65°. In the third Fe site, Fe(3) is bonded to one O(6), two equivalent O(3), two equivalent O(4), and one F(1) atom to form distorted FeO5F octahedra that share corners with two equivalent Mg(1)O5F octahedra, corners with two equivalent Fe(4)O5F octahedra, corners with four equivalent Fe(5)O3F2 trigonal bipyramids, edges with two equivalent Fe(3)O5F octahedra, and  a faceface with one Mg(1)O5F octahedra. The corner-sharing octahedral tilt angles range from 24-50°. In the fourth Fe site, Fe(4) is bonded to one O(4), two equivalent O(10), two equivalent O(7), and one F(2) atom to form FeO5F octahedra that share corners with two equivalent Fe(1)O4F2 octahedra, corners with two equivalent Fe(3)O5F octahedra, corners with four equivalent Fe(6)O6 octahedra, and edges with two equivalent Fe(4)O5F octahedra. The corner-sharing octahedral tilt angles range from 47-50°. In the fifth Fe site, Fe(5) is bonded to one O(8), two equivalent O(6), and two equivalent F(1) atoms to form distorted FeO3F2 trigonal bipyramids that share corners with two equivalent Mg(1)O5F octahedra, corners with two equivalent Fe(6)O6 octahedra, corners with four equivalent Fe(3)O5F octahedra, and edges with two equivalent Fe(5)O3F2 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 49-57°. In the sixth Fe site, Fe(6) is bonded to one O(10), one O(7), two equivalent O(8), and two equivalent O(9) atoms to form FeO6 octahedra that share corners with four equivalent Fe(4)O5F octahedra, corners with two equivalent Fe(2)O5 square pyramids, corners with two equivalent Fe(5)O3F2 trigonal bipyramids, and edges with two equivalent Fe(6)O6 octahedra. The corner-sharing octahedral tilt angles range from 49-50°. There are ten inequivalent O sites. In the first O site, O(1) is bonded to one Mg(1), one Fe(1), and two equivalent Fe(2) atoms to form distorted corner-sharing OMgFe3 tetrahedra. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Fe(1) and two equivalent Fe(2) atoms. In the third O site, O(3) is bonded in a rectangular see-saw-like geometry to two equivalent Mg(1) and two equivalent Fe(3) atoms. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Fe(4) and two equivalent Fe(3) atoms. In the fifth O site, O(5) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Mg(1) and two equivalent Fe(1) atoms. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one Fe(3) and two equivalent Fe(5) atoms. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Fe(6) and two equivalent Fe(4) atoms. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Fe(5) and two equivalent Fe(6) atoms. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Fe(2) and two equivalent Fe(6) atoms. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Fe(6) and two equivalent Fe(4) atoms. There are two inequivalent F sites. In the first F site, F(1) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Fe(3), and two equivalent Fe(5) atoms. In the second F site, F(2) is bonded in a 3-coordinate geometry to one Fe(4) and two equivalent Fe(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_MgFe6(O5F)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.795
_cell_length_b   6.729
_cell_length_c   2.924
_cell_angle_alpha   89.989
_cell_angle_beta   89.994
_cell_angle_gamma   75.941
_symmetry_Int_Tables_number   1
_cell_volume   225.092
_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  0.163  0.188  0.991  1.0
  Fe  Fe1  1  0.979  0.023  0.990  1.0
  Fe  Fe2  1  0.946  0.558  0.490  1.0
  Fe  Fe3  1  0.368  0.308  0.991  1.0
  Fe  Fe4  1  0.652  0.171  0.490  1.0
  Fe  Fe5  1  0.396  0.750  0.490  1.0
  Fe  Fe6  1  0.669  0.666  0.990  1.0
  O  O7  1  0.989  0.355  0.990  1.0
  O  O8  1  0.972  0.737  0.990  1.0
  O  O9  1  0.248  0.310  0.491  1.0
  O  O10  1  0.478  0.232  0.490  1.0
  O  O11  1  0.094  0.022  0.490  1.0
  O  O12  1  0.357  0.602  0.990  1.0
  O  O13  1  0.663  0.354  0.990  1.0
  O  O14  1  0.558  0.717  0.490  1.0
  O  O15  1  0.778  0.615  0.490  1.0
  O  O16  1  0.669  0.978  0.990  1.0
  F  F17  1  0.340  0.976  0.990  1.0
  F  F18  1  0.857  0.097  0.490  1.0
[/CIF]
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