The structure described by Bi4Si3O12 crystallizes in the cubic I-43d space group. Si(1) is bonded in a tetrahedral geometry to four equivalent O(1) atoms. Bi(1) is bonded in a 6-coordinate geometry to six equivalent O(1) atoms. O(1) is bonded in a 3-coordinate geometry to one Si(1) and two equivalent Bi(1) atoms. is represented by the CIF file [CIF]
data_Si3(BiO3)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.892
_cell_length_b   8.892
_cell_length_c   8.892
_cell_angle_alpha   109.471
_cell_angle_beta   109.471
_cell_angle_gamma   109.471
_symmetry_Int_Tables_number   1
_cell_volume   541.269
_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
  Si  Si0  1  0.625  0.375  0.250  1.0
  Si  Si1  1  0.375  0.250  0.625  1.0
  Si  Si2  1  0.250  0.625  0.375  1.0
  Si  Si3  1  0.875  0.125  0.750  1.0
  Si  Si4  1  0.750  0.875  0.125  1.0
  Si  Si5  1  0.125  0.750  0.875  1.0
  Bi  Bi6  1  0.500  1.000  0.337  1.0
  Bi  Bi7  1  0.337  0.500  0.000  1.0
  Bi  Bi8  1  0.837  0.500  1.000  1.0
  Bi  Bi9  1  0.663  0.663  0.663  1.0
  Bi  Bi10  1  1.000  0.837  0.500  1.0
  Bi  Bi11  1  0.000  0.337  0.500  1.0
  Bi  Bi12  1  0.500  1.000  0.837  1.0
  Bi  Bi13  1  0.163  0.163  0.163  1.0
  O  O14  1  0.348  0.191  0.419  1.0
  O  O15  1  0.919  0.691  0.848  1.0
  O  O16  1  0.081  0.272  0.929  1.0
  O  O17  1  0.848  0.919  0.691  1.0
  O  O18  1  0.929  0.081  0.272  1.0
  O  O19  1  0.691  0.848  0.919  1.0
  O  O20  1  0.581  0.429  0.772  1.0
  O  O21  1  0.809  0.728  0.157  1.0
  O  O22  1  0.152  0.571  0.843  1.0
  O  O23  1  0.343  0.071  0.652  1.0
  O  O24  1  0.272  0.929  0.081  1.0
  O  O25  1  0.309  0.657  0.228  1.0
  O  O26  1  0.772  0.581  0.429  1.0
  O  O27  1  0.157  0.809  0.728  1.0
  O  O28  1  0.429  0.772  0.581  1.0
  O  O29  1  0.652  0.343  0.071  1.0
  O  O30  1  0.071  0.652  0.343  1.0
  O  O31  1  0.571  0.843  0.152  1.0
  O  O32  1  0.191  0.419  0.348  1.0
  O  O33  1  0.728  0.157  0.809  1.0
  O  O34  1  0.228  0.309  0.657  1.0
  O  O35  1  0.657  0.228  0.309  1.0
  O  O36  1  0.419  0.348  0.191  1.0
  O  O37  1  0.843  0.152  0.571  1.0
[/CIF]
.
The structure described by Bi4Si3O12 crystallizes in the cubic I-43d space group. Si(1) is bonded in a tetrahedral geometry to four equivalent O(1) atoms. Bi(1) is bonded in a 6-coordinate geometry to six equivalent O(1) atoms. O(1) is bonded in a 3-coordinate geometry to one Si(1) and two equivalent Bi(1) atoms. is represented by the CIF file [CIF]
data_Si3(BiO3)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.892
_cell_length_b   8.892
_cell_length_c   8.892
_cell_angle_alpha   109.471
_cell_angle_beta   109.471
_cell_angle_gamma   109.471
_symmetry_Int_Tables_number   1
_cell_volume   541.269
_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
  Si  Si0  1  0.625  0.375  0.250  1.0
  Si  Si1  1  0.375  0.250  0.625  1.0
  Si  Si2  1  0.250  0.625  0.375  1.0
  Si  Si3  1  0.875  0.125  0.750  1.0
  Si  Si4  1  0.750  0.875  0.125  1.0
  Si  Si5  1  0.125  0.750  0.875  1.0
  Bi  Bi6  1  0.500  1.000  0.337  1.0
  Bi  Bi7  1  0.337  0.500  0.000  1.0
  Bi  Bi8  1  0.837  0.500  1.000  1.0
  Bi  Bi9  1  0.663  0.663  0.663  1.0
  Bi  Bi10  1  1.000  0.837  0.500  1.0
  Bi  Bi11  1  0.000  0.337  0.500  1.0
  Bi  Bi12  1  0.500  1.000  0.837  1.0
  Bi  Bi13  1  0.163  0.163  0.163  1.0
  O  O14  1  0.348  0.191  0.419  1.0
  O  O15  1  0.919  0.691  0.848  1.0
  O  O16  1  0.081  0.272  0.929  1.0
  O  O17  1  0.848  0.919  0.691  1.0
  O  O18  1  0.929  0.081  0.272  1.0
  O  O19  1  0.691  0.848  0.919  1.0
  O  O20  1  0.581  0.429  0.772  1.0
  O  O21  1  0.809  0.728  0.157  1.0
  O  O22  1  0.152  0.571  0.843  1.0
  O  O23  1  0.343  0.071  0.652  1.0
  O  O24  1  0.272  0.929  0.081  1.0
  O  O25  1  0.309  0.657  0.228  1.0
  O  O26  1  0.772  0.581  0.429  1.0
  O  O27  1  0.157  0.809  0.728  1.0
  O  O28  1  0.429  0.772  0.581  1.0
  O  O29  1  0.652  0.343  0.071  1.0
  O  O30  1  0.071  0.652  0.343  1.0
  O  O31  1  0.571  0.843  0.152  1.0
  O  O32  1  0.191  0.419  0.348  1.0
  O  O33  1  0.728  0.157  0.809  1.0
  O  O34  1  0.228  0.309  0.657  1.0
  O  O35  1  0.657  0.228  0.309  1.0
  O  O36  1  0.419  0.348  0.191  1.0
  O  O37  1  0.843  0.152  0.571  1.0
[/CIF]
.