The crystal structure described by Fe7(SiO4)4 is beta indium sulfide-derived structured and crystallizes in the monoclinic P2_1/c space group. There are four inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to two equivalent O(1), two equivalent O(4), and two equivalent O(6) atoms to form FeO6 octahedra that share corners with four equivalent Fe(3)O6 octahedra, corners with two equivalent Si(1)O4 tetrahedra, edges with two equivalent Fe(2)O6 octahedra, edges with two equivalent Fe(3)O6 octahedra, and edges with two equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 57-66°. In the second Fe site, Fe(2) is bonded to one O(1), one O(2), one O(3), one O(4), one O(7), and one O(8) atom to form FeO6 octahedra that share corners with two equivalent Fe(3)O6 octahedra, corners with two equivalent Fe(4)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  an edgeedge with one Fe(1)O6 octahedra,  an edgeedge with one Fe(3)O6 octahedra,  an edgeedge with one Fe(4)O6 octahedra,  an edgeedge with one Si(1)O4 tetrahedra, and  an edgeedge with one Si(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 56-66°. In the third Fe site, Fe(3) is bonded to one O(1), one O(4), one O(7), one O(8), and two equivalent O(6) atoms to form FeO6 octahedra that share corners with two equivalent Fe(1)O6 octahedra, corners with two equivalent Fe(2)O6 octahedra, corners with two equivalent Fe(3)O6 octahedra, corners with two equivalent Fe(4)O6 octahedra,  a cornercorner with one Si(2)O4 tetrahedra, corners with three equivalent Si(1)O4 tetrahedra,  an edgeedge with one Fe(1)O6 octahedra,  an edgeedge with one Fe(2)O6 octahedra, and  an edgeedge with one Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 47-66°. In the fourth Fe site, Fe(4) is bonded to one O(2), one O(3), one O(7), one O(8), and two equivalent O(5) atoms to form FeO6 octahedra that share corners with two equivalent Fe(2)O6 octahedra, corners with two equivalent Fe(3)O6 octahedra, corners with two equivalent Fe(4)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra, corners with three equivalent Si(2)O4 tetrahedra,  an edgeedge with one Fe(2)O6 octahedra, and  an edgeedge with one Si(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 47-66°. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(4), one O(6), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(2)O6 octahedra,  a cornercorner with one Fe(4)O6 octahedra, corners with three equivalent Fe(3)O6 octahedra,  an edgeedge with one Fe(1)O6 octahedra,  an edgeedge with one Fe(2)O6 octahedra, and  an edgeedge with one Fe(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 53-62°. In the second Si site, Si(2) is bonded to one O(2), one O(3), one O(5), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Fe(2)O6 octahedra,  a cornercorner with one Fe(3)O6 octahedra, corners with three equivalent Fe(4)O6 octahedra,  an edgeedge with one Fe(2)O6 octahedra, and  an edgeedge with one Fe(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 45-60°. There are eight inequivalent O sites. In the first O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to one Fe(1), one Fe(2), one Fe(3), and one Si(1) atom. In the second O site, O(5) is bonded in a distorted trigonal planar geometry to two equivalent Fe(4) and one Si(2) atom. In the third O site, O(6) is bonded in a rectangular see-saw-like geometry to one Fe(1), two equivalent Fe(3), and one Si(1) atom. In the fourth O site, O(7) is bonded in a distorted rectangular see-saw-like geometry to one Fe(2), one Fe(3), one Fe(4), and one Si(2) atom. In the fifth O site, O(8) is bonded in a rectangular see-saw-like geometry to one Fe(2), one Fe(3), one Fe(4), and one Si(1) atom. In the sixth O site, O(1) is bonded in a 4-coordinate geometry to one Fe(1), one Fe(2), one Fe(3), and one Si(1) atom. In the seventh O site, O(2) is bonded in a distorted trigonal planar geometry to one Fe(2), one Fe(4), and one Si(2) atom. In the eighth O site, O(3) is bonded in a distorted trigonal planar geometry to one Fe(2), one Fe(4), and one Si(2) atom. is represented by the CIF card [CIF]
data_Fe7(SiO4)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.900
_cell_length_b   10.405
_cell_length_c   12.044
_cell_angle_alpha   89.121
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   613.987
_cell_formula_units_Z   2
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  0.500  0.500  0.500  1.0
  Fe  Fe1  1  0.000  0.000  0.500  1.0
  Fe  Fe2  1  0.003  0.006  0.234  1.0
  Fe  Fe3  1  0.997  0.994  0.766  1.0
  Fe  Fe4  1  0.503  0.494  0.766  1.0
  Fe  Fe5  1  0.497  0.506  0.234  1.0
  Fe  Fe6  1  0.514  0.779  0.372  1.0
  Fe  Fe7  1  0.486  0.221  0.628  1.0
  Fe  Fe8  1  0.014  0.721  0.628  1.0
  Fe  Fe9  1  0.986  0.279  0.372  1.0
  Fe  Fe10  1  0.005  0.729  0.119  1.0
  Fe  Fe11  1  0.995  0.271  0.881  1.0
  Fe  Fe12  1  0.505  0.771  0.881  1.0
  Fe  Fe13  1  0.495  0.229  0.119  1.0
  Si  Si14  1  0.071  0.597  0.370  1.0
  Si  Si15  1  0.929  0.403  0.630  1.0
  Si  Si16  1  0.571  0.903  0.630  1.0
  Si  Si17  1  0.429  0.097  0.370  1.0
  Si  Si18  1  0.564  0.905  0.119  1.0
  Si  Si19  1  0.436  0.095  0.881  1.0
  Si  Si20  1  0.064  0.595  0.881  1.0
  Si  Si21  1  0.936  0.405  0.119  1.0
  O  O22  1  0.737  0.594  0.371  1.0
  O  O23  1  0.263  0.406  0.629  1.0
  O  O24  1  0.237  0.906  0.629  1.0
  O  O25  1  0.763  0.094  0.371  1.0
  O  O26  1  0.265  0.393  0.128  1.0
  O  O27  1  0.735  0.607  0.872  1.0
  O  O28  1  0.765  0.107  0.872  1.0
  O  O29  1  0.235  0.893  0.128  1.0
  O  O30  1  0.673  0.054  0.125  1.0
  O  O31  1  0.327  0.946  0.875  1.0
  O  O32  1  0.173  0.446  0.875  1.0
  O  O33  1  0.827  0.554  0.125  1.0
  O  O34  1  0.287  0.952  0.370  1.0
  O  O35  1  0.713  0.048  0.630  1.0
  O  O36  1  0.787  0.548  0.630  1.0
  O  O37  1  0.213  0.452  0.370  1.0
  O  O38  1  0.796  0.322  0.017  1.0
  O  O39  1  0.204  0.678  0.983  1.0
  O  O40  1  0.296  0.178  0.983  1.0
  O  O41  1  0.704  0.822  0.017  1.0
  O  O42  1  0.212  0.667  0.479  1.0
  O  O43  1  0.788  0.333  0.521  1.0
  O  O44  1  0.712  0.833  0.521  1.0
  O  O45  1  0.288  0.167  0.479  1.0
  O  O46  1  0.731  0.832  0.225  1.0
  O  O47  1  0.269  0.168  0.775  1.0
  O  O48  1  0.231  0.668  0.775  1.0
  O  O49  1  0.769  0.332  0.225  1.0
  O  O50  1  0.290  0.170  0.260  1.0
  O  O51  1  0.710  0.830  0.740  1.0
  O  O52  1  0.790  0.330  0.740  1.0
  O  O53  1  0.210  0.670  0.260  1.0
[/CIF]
.
The crystal structure described by Fe7(SiO4)4 is beta indium sulfide-derived structured and crystallizes in the monoclinic P2_1/c space group. There are four inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to two equivalent O(1), two equivalent O(4), and two equivalent O(6) atoms to form FeO6 octahedra that share corners with four equivalent Fe(3)O6 octahedra, corners with two equivalent Si(1)O4 tetrahedra, edges with two equivalent Fe(2)O6 octahedra, edges with two equivalent Fe(3)O6 octahedra, and edges with two equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 57-66°. In the second Fe site, Fe(2) is bonded to one O(1), one O(2), one O(3), one O(4), one O(7), and one O(8) atom to form FeO6 octahedra that share corners with two equivalent Fe(3)O6 octahedra, corners with two equivalent Fe(4)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  an edgeedge with one Fe(1)O6 octahedra,  an edgeedge with one Fe(3)O6 octahedra,  an edgeedge with one Fe(4)O6 octahedra,  an edgeedge with one Si(1)O4 tetrahedra, and  an edgeedge with one Si(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 56-66°. In the third Fe site, Fe(3) is bonded to one O(1), one O(4), one O(7), one O(8), and two equivalent O(6) atoms to form FeO6 octahedra that share corners with two equivalent Fe(1)O6 octahedra, corners with two equivalent Fe(2)O6 octahedra, corners with two equivalent Fe(3)O6 octahedra, corners with two equivalent Fe(4)O6 octahedra,  a cornercorner with one Si(2)O4 tetrahedra, corners with three equivalent Si(1)O4 tetrahedra,  an edgeedge with one Fe(1)O6 octahedra,  an edgeedge with one Fe(2)O6 octahedra, and  an edgeedge with one Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 47-66°. In the fourth Fe site, Fe(4) is bonded to one O(2), one O(3), one O(7), one O(8), and two equivalent O(5) atoms to form FeO6 octahedra that share corners with two equivalent Fe(2)O6 octahedra, corners with two equivalent Fe(3)O6 octahedra, corners with two equivalent Fe(4)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra, corners with three equivalent Si(2)O4 tetrahedra,  an edgeedge with one Fe(2)O6 octahedra, and  an edgeedge with one Si(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 47-66°. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(4), one O(6), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(2)O6 octahedra,  a cornercorner with one Fe(4)O6 octahedra, corners with three equivalent Fe(3)O6 octahedra,  an edgeedge with one Fe(1)O6 octahedra,  an edgeedge with one Fe(2)O6 octahedra, and  an edgeedge with one Fe(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 53-62°. In the second Si site, Si(2) is bonded to one O(2), one O(3), one O(5), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Fe(2)O6 octahedra,  a cornercorner with one Fe(3)O6 octahedra, corners with three equivalent Fe(4)O6 octahedra,  an edgeedge with one Fe(2)O6 octahedra, and  an edgeedge with one Fe(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 45-60°. There are eight inequivalent O sites. In the first O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to one Fe(1), one Fe(2), one Fe(3), and one Si(1) atom. In the second O site, O(5) is bonded in a distorted trigonal planar geometry to two equivalent Fe(4) and one Si(2) atom. In the third O site, O(6) is bonded in a rectangular see-saw-like geometry to one Fe(1), two equivalent Fe(3), and one Si(1) atom. In the fourth O site, O(7) is bonded in a distorted rectangular see-saw-like geometry to one Fe(2), one Fe(3), one Fe(4), and one Si(2) atom. In the fifth O site, O(8) is bonded in a rectangular see-saw-like geometry to one Fe(2), one Fe(3), one Fe(4), and one Si(1) atom. In the sixth O site, O(1) is bonded in a 4-coordinate geometry to one Fe(1), one Fe(2), one Fe(3), and one Si(1) atom. In the seventh O site, O(2) is bonded in a distorted trigonal planar geometry to one Fe(2), one Fe(4), and one Si(2) atom. In the eighth O site, O(3) is bonded in a distorted trigonal planar geometry to one Fe(2), one Fe(4), and one Si(2) atom. is represented by the CIF card [CIF]
data_Fe7(SiO4)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.900
_cell_length_b   10.405
_cell_length_c   12.044
_cell_angle_alpha   89.121
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   613.987
_cell_formula_units_Z   2
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  0.500  0.500  0.500  1.0
  Fe  Fe1  1  0.000  0.000  0.500  1.0
  Fe  Fe2  1  0.003  0.006  0.234  1.0
  Fe  Fe3  1  0.997  0.994  0.766  1.0
  Fe  Fe4  1  0.503  0.494  0.766  1.0
  Fe  Fe5  1  0.497  0.506  0.234  1.0
  Fe  Fe6  1  0.514  0.779  0.372  1.0
  Fe  Fe7  1  0.486  0.221  0.628  1.0
  Fe  Fe8  1  0.014  0.721  0.628  1.0
  Fe  Fe9  1  0.986  0.279  0.372  1.0
  Fe  Fe10  1  0.005  0.729  0.119  1.0
  Fe  Fe11  1  0.995  0.271  0.881  1.0
  Fe  Fe12  1  0.505  0.771  0.881  1.0
  Fe  Fe13  1  0.495  0.229  0.119  1.0
  Si  Si14  1  0.071  0.597  0.370  1.0
  Si  Si15  1  0.929  0.403  0.630  1.0
  Si  Si16  1  0.571  0.903  0.630  1.0
  Si  Si17  1  0.429  0.097  0.370  1.0
  Si  Si18  1  0.564  0.905  0.119  1.0
  Si  Si19  1  0.436  0.095  0.881  1.0
  Si  Si20  1  0.064  0.595  0.881  1.0
  Si  Si21  1  0.936  0.405  0.119  1.0
  O  O22  1  0.737  0.594  0.371  1.0
  O  O23  1  0.263  0.406  0.629  1.0
  O  O24  1  0.237  0.906  0.629  1.0
  O  O25  1  0.763  0.094  0.371  1.0
  O  O26  1  0.265  0.393  0.128  1.0
  O  O27  1  0.735  0.607  0.872  1.0
  O  O28  1  0.765  0.107  0.872  1.0
  O  O29  1  0.235  0.893  0.128  1.0
  O  O30  1  0.673  0.054  0.125  1.0
  O  O31  1  0.327  0.946  0.875  1.0
  O  O32  1  0.173  0.446  0.875  1.0
  O  O33  1  0.827  0.554  0.125  1.0
  O  O34  1  0.287  0.952  0.370  1.0
  O  O35  1  0.713  0.048  0.630  1.0
  O  O36  1  0.787  0.548  0.630  1.0
  O  O37  1  0.213  0.452  0.370  1.0
  O  O38  1  0.796  0.322  0.017  1.0
  O  O39  1  0.204  0.678  0.983  1.0
  O  O40  1  0.296  0.178  0.983  1.0
  O  O41  1  0.704  0.822  0.017  1.0
  O  O42  1  0.212  0.667  0.479  1.0
  O  O43  1  0.788  0.333  0.521  1.0
  O  O44  1  0.712  0.833  0.521  1.0
  O  O45  1  0.288  0.167  0.479  1.0
  O  O46  1  0.731  0.832  0.225  1.0
  O  O47  1  0.269  0.168  0.775  1.0
  O  O48  1  0.231  0.668  0.775  1.0
  O  O49  1  0.769  0.332  0.225  1.0
  O  O50  1  0.290  0.170  0.260  1.0
  O  O51  1  0.710  0.830  0.740  1.0
  O  O52  1  0.790  0.330  0.740  1.0
  O  O53  1  0.210  0.670  0.260  1.0
[/CIF]
.