The compound described by Bi2Ge3O9 crystallizes in the hexagonal P6_3/m space group. Ge(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form corner-sharing GeO4 tetrahedra. Bi(1) is bonded in a 6-coordinate geometry to six equivalent O(1) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Ge(1) and two equivalent Bi(1) atoms. In the second O site, O(2) is bonded in a bent 120 degrees geometry to two equivalent Ge(1) atoms. is represented by the CIF file [CIF]
data_Ge3Bi2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.962
_cell_length_b   6.962
_cell_length_c   9.927
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   416.711
_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
  Ge  Ge0  1  0.707  0.925  0.750  1.0
  Ge  Ge1  1  0.781  0.707  0.250  1.0
  Ge  Ge2  1  0.925  0.219  0.250  1.0
  Ge  Ge3  1  0.075  0.781  0.750  1.0
  Ge  Ge4  1  0.219  0.293  0.750  1.0
  Ge  Ge5  1  0.293  0.075  0.250  1.0
  Bi  Bi6  1  0.333  0.667  0.470  1.0
  Bi  Bi7  1  0.667  0.333  0.970  1.0
  Bi  Bi8  1  0.667  0.333  0.530  1.0
  Bi  Bi9  1  0.333  0.667  0.030  1.0
  O  O10  1  0.429  0.076  0.397  1.0
  O  O11  1  0.353  0.429  0.897  1.0
  O  O12  1  0.076  0.647  0.897  1.0
  O  O13  1  0.924  0.353  0.397  1.0
  O  O14  1  0.647  0.571  0.397  1.0
  O  O15  1  0.571  0.924  0.897  1.0
  O  O16  1  0.571  0.924  0.603  1.0
  O  O17  1  0.647  0.571  0.103  1.0
  O  O18  1  0.924  0.353  0.103  1.0
  O  O19  1  0.076  0.647  0.603  1.0
  O  O20  1  0.202  0.269  0.250  1.0
  O  O21  1  0.934  0.202  0.750  1.0
  O  O22  1  0.269  0.066  0.750  1.0
  O  O23  1  0.731  0.934  0.250  1.0
  O  O24  1  0.066  0.798  0.250  1.0
  O  O25  1  0.798  0.731  0.750  1.0
  O  O26  1  0.429  0.076  0.103  1.0
  O  O27  1  0.353  0.429  0.603  1.0
[/CIF]
.
The compound described by Bi2Ge3O9 crystallizes in the hexagonal P6_3/m space group. Ge(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form corner-sharing GeO4 tetrahedra. Bi(1) is bonded in a 6-coordinate geometry to six equivalent O(1) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Ge(1) and two equivalent Bi(1) atoms. In the second O site, O(2) is bonded in a bent 120 degrees geometry to two equivalent Ge(1) atoms. is represented by the CIF file [CIF]
data_Ge3Bi2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.962
_cell_length_b   6.962
_cell_length_c   9.927
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   416.711
_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
  Ge  Ge0  1  0.707  0.925  0.750  1.0
  Ge  Ge1  1  0.781  0.707  0.250  1.0
  Ge  Ge2  1  0.925  0.219  0.250  1.0
  Ge  Ge3  1  0.075  0.781  0.750  1.0
  Ge  Ge4  1  0.219  0.293  0.750  1.0
  Ge  Ge5  1  0.293  0.075  0.250  1.0
  Bi  Bi6  1  0.333  0.667  0.470  1.0
  Bi  Bi7  1  0.667  0.333  0.970  1.0
  Bi  Bi8  1  0.667  0.333  0.530  1.0
  Bi  Bi9  1  0.333  0.667  0.030  1.0
  O  O10  1  0.429  0.076  0.397  1.0
  O  O11  1  0.353  0.429  0.897  1.0
  O  O12  1  0.076  0.647  0.897  1.0
  O  O13  1  0.924  0.353  0.397  1.0
  O  O14  1  0.647  0.571  0.397  1.0
  O  O15  1  0.571  0.924  0.897  1.0
  O  O16  1  0.571  0.924  0.603  1.0
  O  O17  1  0.647  0.571  0.103  1.0
  O  O18  1  0.924  0.353  0.103  1.0
  O  O19  1  0.076  0.647  0.603  1.0
  O  O20  1  0.202  0.269  0.250  1.0
  O  O21  1  0.934  0.202  0.750  1.0
  O  O22  1  0.269  0.066  0.750  1.0
  O  O23  1  0.731  0.934  0.250  1.0
  O  O24  1  0.066  0.798  0.250  1.0
  O  O25  1  0.798  0.731  0.750  1.0
  O  O26  1  0.429  0.076  0.103  1.0
  O  O27  1  0.353  0.429  0.603  1.0
[/CIF]
.