The material described by MgFe8(O7F)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(11), one O(14), one O(2), and one O(8) atom to form distorted MgO4 trigonal pyramids that share corners with two equivalent Fe(3)O5F octahedra, corners with two equivalent Fe(7)O5F octahedra, edges with two equivalent Fe(4)O5F octahedra, and edges with two equivalent Fe(6)O5F octahedra. The corner-sharing octahedral tilt angles range from 59-68°. There are eight inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(1), one O(12), one O(3), one O(5), one O(9), and one F(2) atom to form FeO5F octahedra that share corners with four equivalent Fe(7)O5F octahedra, corners with four equivalent Fe(5)O6 octahedra,  an edgeedge with one Fe(4)O5F octahedra, and  an edgeedge with one Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-53°. In the second Fe site, Fe(2) is bonded to one O(1), one O(10), one O(12), one O(13), one O(4), and one O(6) atom to form FeO6 octahedra that share corners with four equivalent Fe(8)O5F octahedra, corners with four equivalent Fe(5)O6 octahedra,  an edgeedge with one Fe(1)O5F octahedra, and  an edgeedge with one Fe(3)O5F octahedra. The corner-sharing octahedral tilt angles range from 45-52°. In the third Fe site, Fe(3) is bonded to one O(13), one O(14), one O(2), one O(4), one O(7), and one F(1) atom to form FeO5F octahedra that share corners with four equivalent Fe(6)O5F octahedra, corners with four equivalent Fe(8)O5F octahedra, corners with two equivalent Mg(1)O4 trigonal pyramids,  an edgeedge with one Fe(4)O5F octahedra, and  an edgeedge with one Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 45-53°. In the fourth Fe site, Fe(4) is bonded to one O(11), one O(14), one O(2), one O(3), one O(8), and one F(2) atom to form FeO5F octahedra that share corners with four equivalent Fe(6)O5F octahedra, corners with four equivalent Fe(7)O5F octahedra,  an edgeedge with one Fe(1)O5F octahedra,  an edgeedge with one Fe(3)O5F octahedra, and edges with two equivalent Mg(1)O4 trigonal pyramids. The corner-sharing octahedral tilt angles range from 45-51°. In the fifth Fe site, Fe(5) is bonded to one O(1), one O(10), one O(12), one O(5), one O(6), and one O(9) atom to form FeO6 octahedra that share corners with four equivalent Fe(1)O5F octahedra, corners with four equivalent Fe(2)O6 octahedra,  an edgeedge with one Fe(7)O5F octahedra, and  an edgeedge with one Fe(8)O5F octahedra. The corner-sharing octahedral tilt angles range from 45-52°. In the sixth Fe site, Fe(6) is bonded to one O(11), one O(14), one O(2), one O(7), one O(8), and one F(1) atom to form FeO5F octahedra that share corners with four equivalent Fe(3)O5F octahedra, corners with four equivalent Fe(4)O5F octahedra,  an edgeedge with one Fe(7)O5F octahedra,  an edgeedge with one Fe(8)O5F octahedra, and edges with two equivalent Mg(1)O4 trigonal pyramids. The corner-sharing octahedral tilt angles range from 45-51°. In the seventh Fe site, Fe(7) is bonded to one O(11), one O(3), one O(5), one O(8), one O(9), and one F(2) atom to form FeO5F octahedra that share corners with four equivalent Fe(1)O5F octahedra, corners with four equivalent Fe(4)O5F octahedra, corners with two equivalent Mg(1)O4 trigonal pyramids,  an edgeedge with one Fe(6)O5F octahedra, and  an edgeedge with one Fe(5)O6 octahedra. The corner-sharing octahedral tilt angles range from 45-53°. In the eighth Fe site, Fe(8) is bonded to one O(10), one O(13), one O(4), one O(6), one O(7), and one F(1) atom to form FeO5F octahedra that share corners with four equivalent Fe(3)O5F octahedra, corners with four equivalent Fe(2)O6 octahedra,  an edgeedge with one Fe(6)O5F octahedra, and  an edgeedge with one Fe(5)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-53°. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Fe(1), one Fe(2), and one Fe(5) atom. In the second O site, O(2) is bonded to one Mg(1), one Fe(3), one Fe(4), and one Fe(6) atom to form a mixture of distorted edge and corner-sharing OMgFe3 trigonal pyramids. In the third O site, O(3) is bonded in a trigonal planar geometry to one Fe(1), one Fe(4), and one Fe(7) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Fe(2), one Fe(3), and one Fe(8) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Fe(1), one Fe(5), and one Fe(7) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Fe(2), one Fe(5), and one Fe(8) atom. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one Fe(3), one Fe(6), and one Fe(8) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Mg(1), one Fe(4), one Fe(6), and one Fe(7) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Fe(1), one Fe(5), and one Fe(7) atom. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Fe(2), one Fe(5), and one Fe(8) atom. In the eleventh O site, O(11) is bonded to one Mg(1), one Fe(4), one Fe(6), and one Fe(7) atom to form a mixture of distorted edge and corner-sharing OMgFe3 trigonal pyramids. In the twelfth O site, O(12) is bonded in a distorted trigonal planar geometry to one Fe(1), one Fe(2), and one Fe(5) atom. In the thirteenth O site, O(13) is bonded in a distorted trigonal planar geometry to one Fe(2), one Fe(3), and one Fe(8) atom. In the fourteenth O site, O(14) is bonded in a 4-coordinate geometry to one Mg(1), one Fe(3), one Fe(4), and one Fe(6) atom. There are two inequivalent F sites. In the first F site, F(1) is bonded in a 3-coordinate geometry to one Fe(3), one Fe(6), and one Fe(8) atom. In the second F site, F(2) is bonded in a 3-coordinate geometry to one Fe(1), one Fe(4), and one Fe(7) atom. is represented by the CIF file [CIF]
data_MgFe8(O7F)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.855
_cell_length_b   4.854
_cell_length_c   11.839
_cell_angle_alpha   90.136
_cell_angle_beta   89.141
_cell_angle_gamma   90.051
_symmetry_Int_Tables_number   1
_cell_volume   278.977
_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  0.502  0.006  0.690  1.0
  Fe  Fe1  1  0.009  0.989  0.010  1.0
  Fe  Fe2  1  0.001  0.992  0.251  1.0
  Fe  Fe3  1  0.026  0.030  0.495  1.0
  Fe  Fe4  1  0.000  0.983  0.754  1.0
  Fe  Fe5  1  0.500  0.493  0.124  1.0
  Fe  Fe6  1  0.490  0.499  0.621  1.0
  Fe  Fe7  1  0.471  0.523  0.880  1.0
  Fe  Fe8  1  0.495  0.487  0.365  1.0
  O  O9  1  0.186  0.802  0.133  1.0
  O  O10  1  0.204  0.813  0.622  1.0
  O  O11  1  0.188  0.823  0.879  1.0
  O  O12  1  0.189  0.811  0.370  1.0
  O  O13  1  0.306  0.312  0.005  1.0
  O  O14  1  0.315  0.303  0.242  1.0
  O  O15  1  0.328  0.311  0.495  1.0
  O  O16  1  0.301  0.310  0.752  1.0
  O  O17  1  0.685  0.684  0.005  1.0
  O  O18  1  0.685  0.676  0.246  1.0
  O  O19  1  0.688  0.697  0.752  1.0
  O  O20  1  0.816  0.174  0.130  1.0
  O  O21  1  0.819  0.190  0.370  1.0
  O  O22  1  0.810  0.194  0.625  1.0
  F  F23  1  0.698  0.706  0.497  1.0
  F  F24  1  0.789  0.189  0.877  1.0
[/CIF]
.
The material described by MgFe8(O7F)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(11), one O(14), one O(2), and one O(8) atom to form distorted MgO4 trigonal pyramids that share corners with two equivalent Fe(3)O5F octahedra, corners with two equivalent Fe(7)O5F octahedra, edges with two equivalent Fe(4)O5F octahedra, and edges with two equivalent Fe(6)O5F octahedra. The corner-sharing octahedral tilt angles range from 59-68°. There are eight inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(1), one O(12), one O(3), one O(5), one O(9), and one F(2) atom to form FeO5F octahedra that share corners with four equivalent Fe(7)O5F octahedra, corners with four equivalent Fe(5)O6 octahedra,  an edgeedge with one Fe(4)O5F octahedra, and  an edgeedge with one Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-53°. In the second Fe site, Fe(2) is bonded to one O(1), one O(10), one O(12), one O(13), one O(4), and one O(6) atom to form FeO6 octahedra that share corners with four equivalent Fe(8)O5F octahedra, corners with four equivalent Fe(5)O6 octahedra,  an edgeedge with one Fe(1)O5F octahedra, and  an edgeedge with one Fe(3)O5F octahedra. The corner-sharing octahedral tilt angles range from 45-52°. In the third Fe site, Fe(3) is bonded to one O(13), one O(14), one O(2), one O(4), one O(7), and one F(1) atom to form FeO5F octahedra that share corners with four equivalent Fe(6)O5F octahedra, corners with four equivalent Fe(8)O5F octahedra, corners with two equivalent Mg(1)O4 trigonal pyramids,  an edgeedge with one Fe(4)O5F octahedra, and  an edgeedge with one Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 45-53°. In the fourth Fe site, Fe(4) is bonded to one O(11), one O(14), one O(2), one O(3), one O(8), and one F(2) atom to form FeO5F octahedra that share corners with four equivalent Fe(6)O5F octahedra, corners with four equivalent Fe(7)O5F octahedra,  an edgeedge with one Fe(1)O5F octahedra,  an edgeedge with one Fe(3)O5F octahedra, and edges with two equivalent Mg(1)O4 trigonal pyramids. The corner-sharing octahedral tilt angles range from 45-51°. In the fifth Fe site, Fe(5) is bonded to one O(1), one O(10), one O(12), one O(5), one O(6), and one O(9) atom to form FeO6 octahedra that share corners with four equivalent Fe(1)O5F octahedra, corners with four equivalent Fe(2)O6 octahedra,  an edgeedge with one Fe(7)O5F octahedra, and  an edgeedge with one Fe(8)O5F octahedra. The corner-sharing octahedral tilt angles range from 45-52°. In the sixth Fe site, Fe(6) is bonded to one O(11), one O(14), one O(2), one O(7), one O(8), and one F(1) atom to form FeO5F octahedra that share corners with four equivalent Fe(3)O5F octahedra, corners with four equivalent Fe(4)O5F octahedra,  an edgeedge with one Fe(7)O5F octahedra,  an edgeedge with one Fe(8)O5F octahedra, and edges with two equivalent Mg(1)O4 trigonal pyramids. The corner-sharing octahedral tilt angles range from 45-51°. In the seventh Fe site, Fe(7) is bonded to one O(11), one O(3), one O(5), one O(8), one O(9), and one F(2) atom to form FeO5F octahedra that share corners with four equivalent Fe(1)O5F octahedra, corners with four equivalent Fe(4)O5F octahedra, corners with two equivalent Mg(1)O4 trigonal pyramids,  an edgeedge with one Fe(6)O5F octahedra, and  an edgeedge with one Fe(5)O6 octahedra. The corner-sharing octahedral tilt angles range from 45-53°. In the eighth Fe site, Fe(8) is bonded to one O(10), one O(13), one O(4), one O(6), one O(7), and one F(1) atom to form FeO5F octahedra that share corners with four equivalent Fe(3)O5F octahedra, corners with four equivalent Fe(2)O6 octahedra,  an edgeedge with one Fe(6)O5F octahedra, and  an edgeedge with one Fe(5)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-53°. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Fe(1), one Fe(2), and one Fe(5) atom. In the second O site, O(2) is bonded to one Mg(1), one Fe(3), one Fe(4), and one Fe(6) atom to form a mixture of distorted edge and corner-sharing OMgFe3 trigonal pyramids. In the third O site, O(3) is bonded in a trigonal planar geometry to one Fe(1), one Fe(4), and one Fe(7) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Fe(2), one Fe(3), and one Fe(8) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Fe(1), one Fe(5), and one Fe(7) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Fe(2), one Fe(5), and one Fe(8) atom. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one Fe(3), one Fe(6), and one Fe(8) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Mg(1), one Fe(4), one Fe(6), and one Fe(7) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Fe(1), one Fe(5), and one Fe(7) atom. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Fe(2), one Fe(5), and one Fe(8) atom. In the eleventh O site, O(11) is bonded to one Mg(1), one Fe(4), one Fe(6), and one Fe(7) atom to form a mixture of distorted edge and corner-sharing OMgFe3 trigonal pyramids. In the twelfth O site, O(12) is bonded in a distorted trigonal planar geometry to one Fe(1), one Fe(2), and one Fe(5) atom. In the thirteenth O site, O(13) is bonded in a distorted trigonal planar geometry to one Fe(2), one Fe(3), and one Fe(8) atom. In the fourteenth O site, O(14) is bonded in a 4-coordinate geometry to one Mg(1), one Fe(3), one Fe(4), and one Fe(6) atom. There are two inequivalent F sites. In the first F site, F(1) is bonded in a 3-coordinate geometry to one Fe(3), one Fe(6), and one Fe(8) atom. In the second F site, F(2) is bonded in a 3-coordinate geometry to one Fe(1), one Fe(4), and one Fe(7) atom. is represented by the CIF file [CIF]
data_MgFe8(O7F)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.855
_cell_length_b   4.854
_cell_length_c   11.839
_cell_angle_alpha   90.136
_cell_angle_beta   89.141
_cell_angle_gamma   90.051
_symmetry_Int_Tables_number   1
_cell_volume   278.977
_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  0.502  0.006  0.690  1.0
  Fe  Fe1  1  0.009  0.989  0.010  1.0
  Fe  Fe2  1  0.001  0.992  0.251  1.0
  Fe  Fe3  1  0.026  0.030  0.495  1.0
  Fe  Fe4  1  0.000  0.983  0.754  1.0
  Fe  Fe5  1  0.500  0.493  0.124  1.0
  Fe  Fe6  1  0.490  0.499  0.621  1.0
  Fe  Fe7  1  0.471  0.523  0.880  1.0
  Fe  Fe8  1  0.495  0.487  0.365  1.0
  O  O9  1  0.186  0.802  0.133  1.0
  O  O10  1  0.204  0.813  0.622  1.0
  O  O11  1  0.188  0.823  0.879  1.0
  O  O12  1  0.189  0.811  0.370  1.0
  O  O13  1  0.306  0.312  0.005  1.0
  O  O14  1  0.315  0.303  0.242  1.0
  O  O15  1  0.328  0.311  0.495  1.0
  O  O16  1  0.301  0.310  0.752  1.0
  O  O17  1  0.685  0.684  0.005  1.0
  O  O18  1  0.685  0.676  0.246  1.0
  O  O19  1  0.688  0.697  0.752  1.0
  O  O20  1  0.816  0.174  0.130  1.0
  O  O21  1  0.819  0.190  0.370  1.0
  O  O22  1  0.810  0.194  0.625  1.0
  F  F23  1  0.698  0.706  0.497  1.0
  F  F24  1  0.789  0.189  0.877  1.0
[/CIF]
.