The structure described by Bi13O20 crystallizes in the cubic I23 space group. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded to one O(2), one O(3), and three equivalent O(1) atoms to form distorted BiO5 square pyramids that share corners with eight equivalent Bi(1)O5 square pyramids,  a cornercorner with one Bi(2)O4 tetrahedra, and  an edgeedge with one Bi(1)O5 square pyramid. In the second Bi site, Bi(2) is bonded to four equivalent O(2) atoms to form corner-sharing BiO4 tetrahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to three equivalent Bi(1) atoms. In the second O site, O(2) is bonded to one Bi(2) and three equivalent Bi(1) atoms to form corner-sharing OBi4 tetrahedra. In the third O site, O(3) is bonded in a trigonal planar geometry to three equivalent Bi(1) atoms. is represented by the CIF card [CIF]
data_Bi13O20
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.910
_cell_length_b   8.910
_cell_length_c   8.910
_cell_angle_alpha   109.472
_cell_angle_beta   109.471
_cell_angle_gamma   109.471
_symmetry_Int_Tables_number   1
_cell_volume   544.484
_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
  Bi  Bi0  1  0.191  0.854  0.693  1.0
  Bi  Bi1  1  0.336  0.838  0.146  1.0
  Bi  Bi2  1  0.498  0.307  0.162  1.0
  Bi  Bi3  1  0.000  0.000  0.000  1.0
  Bi  Bi4  1  0.502  0.664  0.809  1.0
  Bi  Bi5  1  0.838  0.146  0.336  1.0
  Bi  Bi6  1  0.693  0.191  0.854  1.0
  Bi  Bi7  1  0.664  0.809  0.502  1.0
  Bi  Bi8  1  0.854  0.693  0.191  1.0
  Bi  Bi9  1  0.162  0.498  0.307  1.0
  Bi  Bi10  1  0.146  0.336  0.838  1.0
  Bi  Bi11  1  0.809  0.502  0.664  1.0
  Bi  Bi12  1  0.307  0.162  0.498  1.0
  O  O13  1  0.248  0.624  0.889  1.0
  O  O14  1  0.000  0.760  1.000  1.0
  O  O15  1  1.000  1.000  0.760  1.0
  O  O16  1  0.111  0.735  0.359  1.0
  O  O17  1  0.000  0.000  0.372  1.0
  O  O18  1  1.000  0.372  0.000  1.0
  O  O19  1  0.376  0.752  0.641  1.0
  O  O20  1  0.265  0.376  0.624  1.0
  O  O21  1  0.359  0.111  0.735  1.0
  O  O22  1  0.240  0.240  0.240  1.0
  O  O23  1  0.376  0.624  0.265  1.0
  O  O24  1  0.628  0.628  0.628  1.0
  O  O25  1  0.624  0.889  0.248  1.0
  O  O26  1  0.641  0.376  0.752  1.0
  O  O27  1  0.624  0.265  0.376  1.0
  O  O28  1  0.752  0.641  0.376  1.0
  O  O29  1  0.735  0.359  0.111  1.0
  O  O30  1  0.889  0.248  0.624  1.0
  O  O31  1  0.372  1.000  0.000  1.0
  O  O32  1  0.760  1.000  0.000  1.0
[/CIF]
.
The structure described by Bi13O20 crystallizes in the cubic I23 space group. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded to one O(2), one O(3), and three equivalent O(1) atoms to form distorted BiO5 square pyramids that share corners with eight equivalent Bi(1)O5 square pyramids,  a cornercorner with one Bi(2)O4 tetrahedra, and  an edgeedge with one Bi(1)O5 square pyramid. In the second Bi site, Bi(2) is bonded to four equivalent O(2) atoms to form corner-sharing BiO4 tetrahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to three equivalent Bi(1) atoms. In the second O site, O(2) is bonded to one Bi(2) and three equivalent Bi(1) atoms to form corner-sharing OBi4 tetrahedra. In the third O site, O(3) is bonded in a trigonal planar geometry to three equivalent Bi(1) atoms. is represented by the CIF card [CIF]
data_Bi13O20
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.910
_cell_length_b   8.910
_cell_length_c   8.910
_cell_angle_alpha   109.472
_cell_angle_beta   109.471
_cell_angle_gamma   109.471
_symmetry_Int_Tables_number   1
_cell_volume   544.484
_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
  Bi  Bi0  1  0.191  0.854  0.693  1.0
  Bi  Bi1  1  0.336  0.838  0.146  1.0
  Bi  Bi2  1  0.498  0.307  0.162  1.0
  Bi  Bi3  1  0.000  0.000  0.000  1.0
  Bi  Bi4  1  0.502  0.664  0.809  1.0
  Bi  Bi5  1  0.838  0.146  0.336  1.0
  Bi  Bi6  1  0.693  0.191  0.854  1.0
  Bi  Bi7  1  0.664  0.809  0.502  1.0
  Bi  Bi8  1  0.854  0.693  0.191  1.0
  Bi  Bi9  1  0.162  0.498  0.307  1.0
  Bi  Bi10  1  0.146  0.336  0.838  1.0
  Bi  Bi11  1  0.809  0.502  0.664  1.0
  Bi  Bi12  1  0.307  0.162  0.498  1.0
  O  O13  1  0.248  0.624  0.889  1.0
  O  O14  1  0.000  0.760  1.000  1.0
  O  O15  1  1.000  1.000  0.760  1.0
  O  O16  1  0.111  0.735  0.359  1.0
  O  O17  1  0.000  0.000  0.372  1.0
  O  O18  1  1.000  0.372  0.000  1.0
  O  O19  1  0.376  0.752  0.641  1.0
  O  O20  1  0.265  0.376  0.624  1.0
  O  O21  1  0.359  0.111  0.735  1.0
  O  O22  1  0.240  0.240  0.240  1.0
  O  O23  1  0.376  0.624  0.265  1.0
  O  O24  1  0.628  0.628  0.628  1.0
  O  O25  1  0.624  0.889  0.248  1.0
  O  O26  1  0.641  0.376  0.752  1.0
  O  O27  1  0.624  0.265  0.376  1.0
  O  O28  1  0.752  0.641  0.376  1.0
  O  O29  1  0.735  0.359  0.111  1.0
  O  O30  1  0.889  0.248  0.624  1.0
  O  O31  1  0.372  1.000  0.000  1.0
  O  O32  1  0.760  1.000  0.000  1.0
[/CIF]
.