The crystal structure described by Fe10O9F11 is Hydrophilite-derived structured and crystallizes in the orthorhombic Amm2 space group. There are six inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(1), one O(4), two equivalent F(1), and two equivalent F(3) atoms to form FeO2F4 octahedra that share corners with four equivalent Fe(6)O3F3 octahedra, corners with four equivalent Fe(4)O4F2 octahedra,  an edgeedge with one Fe(2)O2F4 octahedra, and  an edgeedge with one Fe(3)OF5 octahedra. The corner-sharing octahedral tilt angles range from 46-52°. In the second Fe site, Fe(2) is bonded to one O(2), one O(5), two equivalent F(1), and two equivalent F(2) atoms to form FeO2F4 octahedra that share corners with four equivalent Fe(4)O4F2 octahedra, corners with four equivalent Fe(5)O4F2 octahedra,  an edgeedge with one Fe(1)O2F4 octahedra, and  an edgeedge with one Fe(2)O2F4 octahedra. The corner-sharing octahedral tilt angles range from 49-50°. In the third Fe site, Fe(3) is bonded to one O(3), one F(4), and four equivalent F(3) atoms to form FeOF5 octahedra that share corners with eight equivalent Fe(6)O3F3 octahedra and edges with two equivalent Fe(1)O2F4 octahedra. The corner-sharing octahedral tilt angles range from 48-58°. In the fourth Fe site, Fe(4) is bonded to one O(1), one O(2), one O(4), one O(5), and two equivalent F(1) atoms to form FeO4F2 octahedra that share corners with four equivalent Fe(1)O2F4 octahedra, corners with four equivalent Fe(2)O2F4 octahedra,  an edgeedge with one Fe(6)O3F3 octahedra, and  an edgeedge with one Fe(5)O4F2 octahedra. The corner-sharing octahedral tilt angles range from 47-50°. In the fifth Fe site, Fe(5) is bonded to two equivalent O(2), two equivalent O(5), and two equivalent F(2) atoms to form FeO4F2 octahedra that share corners with eight equivalent Fe(2)O2F4 octahedra and edges with two equivalent Fe(4)O4F2 octahedra. The corner-sharing octahedral tilt angles range from 49-50°. In the sixth Fe site, Fe(6) is bonded to one O(1), one O(3), one O(4), one F(4), and two equivalent F(3) atoms to form FeO3F3 octahedra that share corners with four equivalent Fe(1)O2F4 octahedra, corners with four equivalent Fe(3)OF5 octahedra,  an edgeedge with one Fe(6)O3F3 octahedra, and  an edgeedge with one Fe(4)O4F2 octahedra. The corner-sharing octahedral tilt angles range from 46-58°. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Fe(1), one Fe(4), and one Fe(6) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Fe(2), one Fe(4), and one Fe(5) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one Fe(3) and two equivalent Fe(6) atoms. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Fe(1), one Fe(4), and one Fe(6) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Fe(2), one Fe(4), and one Fe(5) atom. There are four inequivalent F sites. In the first F site, F(1) is bonded in a distorted 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(5) and two equivalent Fe(2) atoms. 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(6) atom. In the fourth F site, F(4) is bonded in a distorted trigonal planar geometry to one Fe(3) and two equivalent Fe(6) atoms. is represented by the CIF card [CIF]
data_Fe10O9F11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.780
_cell_length_b   4.780
_cell_length_c   15.417
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   95.580
_symmetry_Int_Tables_number   1
_cell_volume   350.592
_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  0.995  0.995  0.698  1.0
  Fe  Fe1  1  0.000  0.000  0.900  1.0
  Fe  Fe2  1  0.000  0.000  0.100  1.0
  Fe  Fe3  1  0.995  0.995  0.302  1.0
  Fe  Fe4  1  0.024  0.024  0.500  1.0
  Fe  Fe5  1  0.499  0.499  0.802  1.0
  Fe  Fe6  1  0.499  0.499  0.198  1.0
  Fe  Fe7  1  0.500  0.500  0.000  1.0
  Fe  Fe8  1  0.489  0.489  0.394  1.0
  Fe  Fe9  1  0.489  0.489  0.606  1.0
  O  O10  1  0.294  0.294  0.703  1.0
  O  O11  1  0.299  0.299  0.901  1.0
  O  O12  1  0.299  0.299  0.099  1.0
  O  O13  1  0.294  0.294  0.297  1.0
  O  O14  1  0.327  0.327  0.500  1.0
  O  O15  1  0.698  0.698  0.701  1.0
  O  O16  1  0.700  0.700  0.900  1.0
  O  O17  1  0.700  0.700  0.100  1.0
  O  O18  1  0.698  0.698  0.299  1.0
  F  F19  1  0.805  0.190  0.800  1.0
  F  F20  1  0.807  0.193  0.000  1.0
  F  F21  1  0.805  0.190  0.200  1.0
  F  F22  1  0.798  0.202  0.396  1.0
  F  F23  1  0.798  0.202  0.604  1.0
  F  F24  1  0.711  0.711  0.500  1.0
  F  F25  1  0.190  0.805  0.800  1.0
  F  F26  1  0.190  0.805  0.200  1.0
  F  F27  1  0.193  0.807  0.000  1.0
  F  F28  1  0.202  0.798  0.604  1.0
  F  F29  1  0.202  0.798  0.396  1.0
[/CIF]
.
The crystal structure described by Fe10O9F11 is Hydrophilite-derived structured and crystallizes in the orthorhombic Amm2 space group. There are six inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(1), one O(4), two equivalent F(1), and two equivalent F(3) atoms to form FeO2F4 octahedra that share corners with four equivalent Fe(6)O3F3 octahedra, corners with four equivalent Fe(4)O4F2 octahedra,  an edgeedge with one Fe(2)O2F4 octahedra, and  an edgeedge with one Fe(3)OF5 octahedra. The corner-sharing octahedral tilt angles range from 46-52°. In the second Fe site, Fe(2) is bonded to one O(2), one O(5), two equivalent F(1), and two equivalent F(2) atoms to form FeO2F4 octahedra that share corners with four equivalent Fe(4)O4F2 octahedra, corners with four equivalent Fe(5)O4F2 octahedra,  an edgeedge with one Fe(1)O2F4 octahedra, and  an edgeedge with one Fe(2)O2F4 octahedra. The corner-sharing octahedral tilt angles range from 49-50°. In the third Fe site, Fe(3) is bonded to one O(3), one F(4), and four equivalent F(3) atoms to form FeOF5 octahedra that share corners with eight equivalent Fe(6)O3F3 octahedra and edges with two equivalent Fe(1)O2F4 octahedra. The corner-sharing octahedral tilt angles range from 48-58°. In the fourth Fe site, Fe(4) is bonded to one O(1), one O(2), one O(4), one O(5), and two equivalent F(1) atoms to form FeO4F2 octahedra that share corners with four equivalent Fe(1)O2F4 octahedra, corners with four equivalent Fe(2)O2F4 octahedra,  an edgeedge with one Fe(6)O3F3 octahedra, and  an edgeedge with one Fe(5)O4F2 octahedra. The corner-sharing octahedral tilt angles range from 47-50°. In the fifth Fe site, Fe(5) is bonded to two equivalent O(2), two equivalent O(5), and two equivalent F(2) atoms to form FeO4F2 octahedra that share corners with eight equivalent Fe(2)O2F4 octahedra and edges with two equivalent Fe(4)O4F2 octahedra. The corner-sharing octahedral tilt angles range from 49-50°. In the sixth Fe site, Fe(6) is bonded to one O(1), one O(3), one O(4), one F(4), and two equivalent F(3) atoms to form FeO3F3 octahedra that share corners with four equivalent Fe(1)O2F4 octahedra, corners with four equivalent Fe(3)OF5 octahedra,  an edgeedge with one Fe(6)O3F3 octahedra, and  an edgeedge with one Fe(4)O4F2 octahedra. The corner-sharing octahedral tilt angles range from 46-58°. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Fe(1), one Fe(4), and one Fe(6) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Fe(2), one Fe(4), and one Fe(5) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one Fe(3) and two equivalent Fe(6) atoms. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Fe(1), one Fe(4), and one Fe(6) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Fe(2), one Fe(4), and one Fe(5) atom. There are four inequivalent F sites. In the first F site, F(1) is bonded in a distorted 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(5) and two equivalent Fe(2) atoms. 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(6) atom. In the fourth F site, F(4) is bonded in a distorted trigonal planar geometry to one Fe(3) and two equivalent Fe(6) atoms. is represented by the CIF card [CIF]
data_Fe10O9F11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.780
_cell_length_b   4.780
_cell_length_c   15.417
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   95.580
_symmetry_Int_Tables_number   1
_cell_volume   350.592
_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  0.995  0.995  0.698  1.0
  Fe  Fe1  1  0.000  0.000  0.900  1.0
  Fe  Fe2  1  0.000  0.000  0.100  1.0
  Fe  Fe3  1  0.995  0.995  0.302  1.0
  Fe  Fe4  1  0.024  0.024  0.500  1.0
  Fe  Fe5  1  0.499  0.499  0.802  1.0
  Fe  Fe6  1  0.499  0.499  0.198  1.0
  Fe  Fe7  1  0.500  0.500  0.000  1.0
  Fe  Fe8  1  0.489  0.489  0.394  1.0
  Fe  Fe9  1  0.489  0.489  0.606  1.0
  O  O10  1  0.294  0.294  0.703  1.0
  O  O11  1  0.299  0.299  0.901  1.0
  O  O12  1  0.299  0.299  0.099  1.0
  O  O13  1  0.294  0.294  0.297  1.0
  O  O14  1  0.327  0.327  0.500  1.0
  O  O15  1  0.698  0.698  0.701  1.0
  O  O16  1  0.700  0.700  0.900  1.0
  O  O17  1  0.700  0.700  0.100  1.0
  O  O18  1  0.698  0.698  0.299  1.0
  F  F19  1  0.805  0.190  0.800  1.0
  F  F20  1  0.807  0.193  0.000  1.0
  F  F21  1  0.805  0.190  0.200  1.0
  F  F22  1  0.798  0.202  0.396  1.0
  F  F23  1  0.798  0.202  0.604  1.0
  F  F24  1  0.711  0.711  0.500  1.0
  F  F25  1  0.190  0.805  0.800  1.0
  F  F26  1  0.190  0.805  0.200  1.0
  F  F27  1  0.193  0.807  0.000  1.0
  F  F28  1  0.202  0.798  0.604  1.0
  F  F29  1  0.202  0.798  0.396  1.0
[/CIF]
.