The compound described by Fe10O9F11 is Hydrophilite-derived structured and crystallizes in the monoclinic C2 space group. There are six inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to two equivalent O(3), two equivalent F(1), and two equivalent F(4) atoms to form FeO2F4 octahedra that share corners with eight equivalent Fe(4)O3F3 octahedra and edges with two equivalent Fe(2)O2F4 octahedra. The corner-sharing octahedral tilt angles range from 44-52°. In the second Fe site, Fe(2) is bonded to one O(1), one O(5), one F(1), one F(2), one F(4), and one F(6) atom to form FeO2F4 octahedra that share corners with four equivalent Fe(4)O3F3 octahedra, corners with four equivalent Fe(6)O3F3 octahedra,  an edgeedge with one Fe(1)O2F4 octahedra, and  an edgeedge with one Fe(3)O3F3 octahedra. The corner-sharing octahedral tilt angles range from 44-62°. In the third Fe site, Fe(3) is bonded to one O(1), one O(2), one O(4), one F(3), one F(5), and one F(6) atom to form FeO3F3 octahedra that share corners with four equivalent Fe(5)O3F3 octahedra, corners with four equivalent Fe(6)O3F3 octahedra,  an edgeedge with one Fe(2)O2F4 octahedra, and  an edgeedge with one Fe(3)O3F3 octahedra. The corner-sharing octahedral tilt angles range from 43-56°. In the fourth Fe site, Fe(4) is bonded to one O(5), two equivalent O(3), one F(1), one F(2), and one F(4) atom to form FeO3F3 octahedra that share corners with four equivalent Fe(1)O2F4 octahedra, corners with four equivalent Fe(2)O2F4 octahedra,  an edgeedge with one Fe(4)O3F3 octahedra, and  an edgeedge with one Fe(6)O3F3 octahedra. The corner-sharing octahedral tilt angles range from 44-52°. In the fifth Fe site, Fe(5) is bonded to one O(2), two equivalent O(4), one F(5), and two equivalent F(3) atoms to form a mixture of corner and edge-sharing FeO3F3 octahedra. The corner-sharing octahedral tilt angles range from 46-53°. In the sixth Fe site, Fe(6) is bonded to one O(1), one O(4), one O(5), one F(2), one F(3), and one F(6) atom to form FeO3F3 octahedra that share corners with four equivalent Fe(2)O2F4 octahedra, corners with four equivalent Fe(3)O3F3 octahedra,  an edgeedge with one Fe(4)O3F3 octahedra, and  an edgeedge with one Fe(5)O3F3 octahedra. The corner-sharing octahedral tilt angles range from 43-62°. There are five inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Fe(2), one Fe(3), and one Fe(6) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Fe(5) and two equivalent Fe(3) atoms. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Fe(1) and two equivalent Fe(4) atoms. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Fe(3), one Fe(5), and one Fe(6) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Fe(2), one Fe(4), and one Fe(6) atom. There are six inequivalent F sites. In the first F site, F(1) is bonded in a trigonal planar geometry to one Fe(1), one Fe(2), and one Fe(4) atom. In the second F site, F(2) is bonded in a distorted trigonal planar geometry to one Fe(2), one Fe(4), and one Fe(6) atom. In the third F site, F(3) is bonded in a distorted trigonal planar geometry to one Fe(3), one Fe(5), and one Fe(6) atom. In the fourth F site, F(4) is bonded in a distorted trigonal planar geometry to one Fe(1), one Fe(2), and one Fe(4) atom. In the fifth F site, F(5) is bonded in a distorted T-shaped geometry to one Fe(5) and two equivalent Fe(3) atoms. In the sixth F site, F(6) is bonded in a distorted T-shaped geometry to one Fe(2), one Fe(3), and one Fe(6) atom. is represented by the CIF file [CIF]
data_Fe10O9F11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.754
_cell_length_b   4.754
_cell_length_c   15.534
_cell_angle_alpha   89.991
_cell_angle_beta   89.991
_cell_angle_gamma   91.944
_symmetry_Int_Tables_number   1
_cell_volume   350.915
_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
  Fe  Fe0  1  0.001  0.999  0.000  1.0
  Fe  Fe1  1  0.971  0.986  0.207  1.0
  Fe  Fe2  1  0.950  0.001  0.402  1.0
  Fe  Fe3  1  0.999  0.050  0.598  1.0
  Fe  Fe4  1  0.014  0.029  0.793  1.0
  Fe  Fe5  1  0.508  0.513  0.094  1.0
  Fe  Fe6  1  0.518  0.482  0.500  1.0
  Fe  Fe7  1  0.545  0.498  0.298  1.0
  Fe  Fe8  1  0.502  0.455  0.702  1.0
  Fe  Fe9  1  0.487  0.492  0.906  1.0
  O  O10  1  0.800  0.189  0.301  1.0
  O  O11  1  0.804  0.196  0.500  1.0
  O  O12  1  0.811  0.200  0.699  1.0
  O  O13  1  0.296  0.300  0.002  1.0
  O  O14  1  0.314  0.315  0.598  1.0
  O  O15  1  0.319  0.316  0.805  1.0
  O  O16  1  0.700  0.704  0.998  1.0
  O  O17  1  0.684  0.681  0.195  1.0
  O  O18  1  0.685  0.686  0.402  1.0
  F  F19  1  0.801  0.192  0.098  1.0
  F  F20  1  0.808  0.199  0.902  1.0
  F  F21  1  0.296  0.294  0.197  1.0
  F  F22  1  0.296  0.293  0.398  1.0
  F  F23  1  0.707  0.704  0.602  1.0
  F  F24  1  0.706  0.704  0.803  1.0
  F  F25  1  0.190  0.806  0.100  1.0
  F  F26  1  0.191  0.809  0.500  1.0
  F  F27  1  0.195  0.792  0.302  1.0
  F  F28  1  0.194  0.810  0.900  1.0
  F  F29  1  0.208  0.805  0.698  1.0
[/CIF]
.
The compound described by Fe10O9F11 is Hydrophilite-derived structured and crystallizes in the monoclinic C2 space group. There are six inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to two equivalent O(3), two equivalent F(1), and two equivalent F(4) atoms to form FeO2F4 octahedra that share corners with eight equivalent Fe(4)O3F3 octahedra and edges with two equivalent Fe(2)O2F4 octahedra. The corner-sharing octahedral tilt angles range from 44-52°. In the second Fe site, Fe(2) is bonded to one O(1), one O(5), one F(1), one F(2), one F(4), and one F(6) atom to form FeO2F4 octahedra that share corners with four equivalent Fe(4)O3F3 octahedra, corners with four equivalent Fe(6)O3F3 octahedra,  an edgeedge with one Fe(1)O2F4 octahedra, and  an edgeedge with one Fe(3)O3F3 octahedra. The corner-sharing octahedral tilt angles range from 44-62°. In the third Fe site, Fe(3) is bonded to one O(1), one O(2), one O(4), one F(3), one F(5), and one F(6) atom to form FeO3F3 octahedra that share corners with four equivalent Fe(5)O3F3 octahedra, corners with four equivalent Fe(6)O3F3 octahedra,  an edgeedge with one Fe(2)O2F4 octahedra, and  an edgeedge with one Fe(3)O3F3 octahedra. The corner-sharing octahedral tilt angles range from 43-56°. In the fourth Fe site, Fe(4) is bonded to one O(5), two equivalent O(3), one F(1), one F(2), and one F(4) atom to form FeO3F3 octahedra that share corners with four equivalent Fe(1)O2F4 octahedra, corners with four equivalent Fe(2)O2F4 octahedra,  an edgeedge with one Fe(4)O3F3 octahedra, and  an edgeedge with one Fe(6)O3F3 octahedra. The corner-sharing octahedral tilt angles range from 44-52°. In the fifth Fe site, Fe(5) is bonded to one O(2), two equivalent O(4), one F(5), and two equivalent F(3) atoms to form a mixture of corner and edge-sharing FeO3F3 octahedra. The corner-sharing octahedral tilt angles range from 46-53°. In the sixth Fe site, Fe(6) is bonded to one O(1), one O(4), one O(5), one F(2), one F(3), and one F(6) atom to form FeO3F3 octahedra that share corners with four equivalent Fe(2)O2F4 octahedra, corners with four equivalent Fe(3)O3F3 octahedra,  an edgeedge with one Fe(4)O3F3 octahedra, and  an edgeedge with one Fe(5)O3F3 octahedra. The corner-sharing octahedral tilt angles range from 43-62°. There are five inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Fe(2), one Fe(3), and one Fe(6) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Fe(5) and two equivalent Fe(3) atoms. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Fe(1) and two equivalent Fe(4) atoms. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Fe(3), one Fe(5), and one Fe(6) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Fe(2), one Fe(4), and one Fe(6) atom. There are six inequivalent F sites. In the first F site, F(1) is bonded in a trigonal planar geometry to one Fe(1), one Fe(2), and one Fe(4) atom. In the second F site, F(2) is bonded in a distorted trigonal planar geometry to one Fe(2), one Fe(4), and one Fe(6) atom. In the third F site, F(3) is bonded in a distorted trigonal planar geometry to one Fe(3), one Fe(5), and one Fe(6) atom. In the fourth F site, F(4) is bonded in a distorted trigonal planar geometry to one Fe(1), one Fe(2), and one Fe(4) atom. In the fifth F site, F(5) is bonded in a distorted T-shaped geometry to one Fe(5) and two equivalent Fe(3) atoms. In the sixth F site, F(6) is bonded in a distorted T-shaped geometry to one Fe(2), one Fe(3), and one Fe(6) atom. is represented by the CIF file [CIF]
data_Fe10O9F11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.754
_cell_length_b   4.754
_cell_length_c   15.534
_cell_angle_alpha   89.991
_cell_angle_beta   89.991
_cell_angle_gamma   91.944
_symmetry_Int_Tables_number   1
_cell_volume   350.915
_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
  Fe  Fe0  1  0.001  0.999  0.000  1.0
  Fe  Fe1  1  0.971  0.986  0.207  1.0
  Fe  Fe2  1  0.950  0.001  0.402  1.0
  Fe  Fe3  1  0.999  0.050  0.598  1.0
  Fe  Fe4  1  0.014  0.029  0.793  1.0
  Fe  Fe5  1  0.508  0.513  0.094  1.0
  Fe  Fe6  1  0.518  0.482  0.500  1.0
  Fe  Fe7  1  0.545  0.498  0.298  1.0
  Fe  Fe8  1  0.502  0.455  0.702  1.0
  Fe  Fe9  1  0.487  0.492  0.906  1.0
  O  O10  1  0.800  0.189  0.301  1.0
  O  O11  1  0.804  0.196  0.500  1.0
  O  O12  1  0.811  0.200  0.699  1.0
  O  O13  1  0.296  0.300  0.002  1.0
  O  O14  1  0.314  0.315  0.598  1.0
  O  O15  1  0.319  0.316  0.805  1.0
  O  O16  1  0.700  0.704  0.998  1.0
  O  O17  1  0.684  0.681  0.195  1.0
  O  O18  1  0.685  0.686  0.402  1.0
  F  F19  1  0.801  0.192  0.098  1.0
  F  F20  1  0.808  0.199  0.902  1.0
  F  F21  1  0.296  0.294  0.197  1.0
  F  F22  1  0.296  0.293  0.398  1.0
  F  F23  1  0.707  0.704  0.602  1.0
  F  F24  1  0.706  0.704  0.803  1.0
  F  F25  1  0.190  0.806  0.100  1.0
  F  F26  1  0.191  0.809  0.500  1.0
  F  F27  1  0.195  0.792  0.302  1.0
  F  F28  1  0.194  0.810  0.900  1.0
  F  F29  1  0.208  0.805  0.698  1.0
[/CIF]
.