The material described by Fe5(GeO4)3 crystallizes in the tetragonal I-42d space group. There are three inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form FeO6 octahedra that share corners with two equivalent Fe(2)O6 octahedra, corners with two equivalent Ge(1)O4 tetrahedra, corners with two equivalent Ge(2)O4 tetrahedra, edges with two equivalent Fe(2)O6 octahedra, and  an edgeedge with one Ge(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 59°. In the second Fe site, Fe(2) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form FeO6 octahedra that share corners with two equivalent Fe(1)O6 octahedra, corners with two equivalent Ge(2)O4 tetrahedra, corners with four equivalent Ge(1)O4 tetrahedra, and edges with two equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles are 59°. In the third Fe site, Fe(3) is bonded in a 4-coordinate geometry to four equivalent O(3) atoms. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to two equivalent O(1) and two equivalent O(3) atoms to form distorted GeO4 tetrahedra that share corners with two equivalent Fe(1)O6 octahedra, corners with four equivalent Fe(2)O6 octahedra, and  an edgeedge with one Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 40-57°. In the second Ge site, Ge(2) is bonded to four equivalent O(2) atoms to form GeO4 tetrahedra that share corners with four equivalent Fe(1)O6 octahedra and corners with four equivalent Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-51°. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Fe(1), one Fe(2), and one Ge(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Fe(1), one Fe(2), and one Ge(2) atom. In the third O site, O(3) is bonded to one Fe(1), one Fe(2), one Fe(3), and one Ge(1) atom to form a mixture of corner and edge-sharing OFe3Ge tetrahedra. is represented by the CIF file [CIF]
data_Fe5(GeO4)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.801
_cell_length_b   10.801
_cell_length_c   10.801
_cell_angle_alpha   142.488
_cell_angle_beta   142.488
_cell_angle_gamma   54.095
_symmetry_Int_Tables_number   1
_cell_volume   464.082
_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  0.117  0.125  0.492  1.0
  Fe  Fe1  1  0.633  0.625  0.508  1.0
  Fe  Fe2  1  0.875  0.367  0.992  1.0
  Fe  Fe3  1  0.375  0.883  0.008  1.0
  Fe  Fe4  1  0.978  0.478  0.500  1.0
  Fe  Fe5  1  0.522  0.022  0.500  1.0
  Fe  Fe6  1  0.772  0.772  0.000  1.0
  Fe  Fe7  1  0.228  0.228  0.000  1.0
  Fe  Fe8  1  0.250  0.750  0.500  1.0
  Fe  Fe9  1  0.500  0.500  0.000  1.0
  Ge  Ge10  1  0.534  0.125  0.909  1.0
  Ge  Ge11  1  0.216  0.625  0.091  1.0
  Ge  Ge12  1  0.875  0.784  0.409  1.0
  Ge  Ge13  1  0.375  0.466  0.591  1.0
  Ge  Ge14  1  0.750  0.250  0.500  1.0
  Ge  Ge15  1  0.000  0.000  0.000  1.0
  O  O16  1  0.180  0.382  0.263  1.0
  O  O17  1  0.119  0.917  0.737  1.0
  O  O18  1  0.618  0.881  0.798  1.0
  O  O19  1  0.570  0.333  0.702  1.0
  O  O20  1  0.083  0.820  0.202  1.0
  O  O21  1  0.631  0.868  0.298  1.0
  O  O22  1  0.132  0.430  0.763  1.0
  O  O23  1  0.667  0.369  0.237  1.0
  O  O24  1  0.856  0.085  0.347  1.0
  O  O25  1  0.738  0.510  0.653  1.0
  O  O26  1  0.915  0.262  0.772  1.0
  O  O27  1  0.894  0.740  0.728  1.0
  O  O28  1  0.490  0.144  0.228  1.0
  O  O29  1  0.012  0.165  0.272  1.0
  O  O30  1  0.835  0.106  0.847  1.0
  O  O31  1  0.260  0.988  0.153  1.0
  O  O32  1  0.290  0.079  0.758  1.0
  O  O33  1  0.321  0.532  0.242  1.0
  O  O34  1  0.921  0.679  0.211  1.0
  O  O35  1  0.460  0.718  0.289  1.0
  O  O36  1  0.468  0.710  0.789  1.0
  O  O37  1  0.429  0.171  0.711  1.0
  O  O38  1  0.829  0.540  0.258  1.0
  O  O39  1  0.282  0.571  0.742  1.0
[/CIF]
.
The material described by Fe5(GeO4)3 crystallizes in the tetragonal I-42d space group. There are three inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form FeO6 octahedra that share corners with two equivalent Fe(2)O6 octahedra, corners with two equivalent Ge(1)O4 tetrahedra, corners with two equivalent Ge(2)O4 tetrahedra, edges with two equivalent Fe(2)O6 octahedra, and  an edgeedge with one Ge(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 59°. In the second Fe site, Fe(2) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form FeO6 octahedra that share corners with two equivalent Fe(1)O6 octahedra, corners with two equivalent Ge(2)O4 tetrahedra, corners with four equivalent Ge(1)O4 tetrahedra, and edges with two equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles are 59°. In the third Fe site, Fe(3) is bonded in a 4-coordinate geometry to four equivalent O(3) atoms. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to two equivalent O(1) and two equivalent O(3) atoms to form distorted GeO4 tetrahedra that share corners with two equivalent Fe(1)O6 octahedra, corners with four equivalent Fe(2)O6 octahedra, and  an edgeedge with one Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 40-57°. In the second Ge site, Ge(2) is bonded to four equivalent O(2) atoms to form GeO4 tetrahedra that share corners with four equivalent Fe(1)O6 octahedra and corners with four equivalent Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-51°. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Fe(1), one Fe(2), and one Ge(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Fe(1), one Fe(2), and one Ge(2) atom. In the third O site, O(3) is bonded to one Fe(1), one Fe(2), one Fe(3), and one Ge(1) atom to form a mixture of corner and edge-sharing OFe3Ge tetrahedra. is represented by the CIF file [CIF]
data_Fe5(GeO4)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.801
_cell_length_b   10.801
_cell_length_c   10.801
_cell_angle_alpha   142.488
_cell_angle_beta   142.488
_cell_angle_gamma   54.095
_symmetry_Int_Tables_number   1
_cell_volume   464.082
_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  0.117  0.125  0.492  1.0
  Fe  Fe1  1  0.633  0.625  0.508  1.0
  Fe  Fe2  1  0.875  0.367  0.992  1.0
  Fe  Fe3  1  0.375  0.883  0.008  1.0
  Fe  Fe4  1  0.978  0.478  0.500  1.0
  Fe  Fe5  1  0.522  0.022  0.500  1.0
  Fe  Fe6  1  0.772  0.772  0.000  1.0
  Fe  Fe7  1  0.228  0.228  0.000  1.0
  Fe  Fe8  1  0.250  0.750  0.500  1.0
  Fe  Fe9  1  0.500  0.500  0.000  1.0
  Ge  Ge10  1  0.534  0.125  0.909  1.0
  Ge  Ge11  1  0.216  0.625  0.091  1.0
  Ge  Ge12  1  0.875  0.784  0.409  1.0
  Ge  Ge13  1  0.375  0.466  0.591  1.0
  Ge  Ge14  1  0.750  0.250  0.500  1.0
  Ge  Ge15  1  0.000  0.000  0.000  1.0
  O  O16  1  0.180  0.382  0.263  1.0
  O  O17  1  0.119  0.917  0.737  1.0
  O  O18  1  0.618  0.881  0.798  1.0
  O  O19  1  0.570  0.333  0.702  1.0
  O  O20  1  0.083  0.820  0.202  1.0
  O  O21  1  0.631  0.868  0.298  1.0
  O  O22  1  0.132  0.430  0.763  1.0
  O  O23  1  0.667  0.369  0.237  1.0
  O  O24  1  0.856  0.085  0.347  1.0
  O  O25  1  0.738  0.510  0.653  1.0
  O  O26  1  0.915  0.262  0.772  1.0
  O  O27  1  0.894  0.740  0.728  1.0
  O  O28  1  0.490  0.144  0.228  1.0
  O  O29  1  0.012  0.165  0.272  1.0
  O  O30  1  0.835  0.106  0.847  1.0
  O  O31  1  0.260  0.988  0.153  1.0
  O  O32  1  0.290  0.079  0.758  1.0
  O  O33  1  0.321  0.532  0.242  1.0
  O  O34  1  0.921  0.679  0.211  1.0
  O  O35  1  0.460  0.718  0.289  1.0
  O  O36  1  0.468  0.710  0.789  1.0
  O  O37  1  0.429  0.171  0.711  1.0
  O  O38  1  0.829  0.540  0.258  1.0
  O  O39  1  0.282  0.571  0.742  1.0
[/CIF]
.