The crystal structure described by Bi2B8O15 crystallizes in the triclinic P-1 space group. There are eight inequivalent B sites. In the first B site, B(1) is bonded in a tetrahedral geometry to one O(1), one O(5), one O(7), and one O(9) atom. In the second B site, B(2) is bonded in a tetrahedral geometry to one O(10), one O(2), one O(3), and one O(8) atom. In the third B site, B(3) is bonded in a trigonal planar geometry to one O(1), one O(5), and one O(6) atom. In the fourth B site, B(4) is bonded in a trigonal planar geometry to one O(2), one O(3), and one O(4) atom. In the fifth B site, B(5) is bonded in a trigonal planar geometry to one O(13), one O(15), and one O(9) atom. In the sixth B site, B(6) is bonded in a trigonal planar geometry to one O(10), one O(11), and one O(12) atom. In the seventh B site, B(7) is bonded in a trigonal planar geometry to one O(12), one O(14), and one O(15) atom. In the eighth B site, B(8) is bonded in a trigonal planar geometry to one O(11), one O(13), and one O(14) atom. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 6-coordinate geometry to one O(10), one O(2), two equivalent O(4), and two equivalent O(8) atoms. In the second Bi site, Bi(2) is bonded in a 5-coordinate geometry to one O(1), two equivalent O(6), and two equivalent O(7) atoms. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one B(1), one B(3), and one Bi(2) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one B(2), one B(4), and one Bi(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one B(2) and one B(4) atom. In the fourth O site, O(4) is bonded in a 1-coordinate geometry to one B(4) and two equivalent Bi(1) atoms. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one B(1) and one B(3) atom. In the sixth O site, O(6) is bonded in a 1-coordinate geometry to one B(3) and two equivalent Bi(2) atoms. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one B(1) and two equivalent Bi(2) atoms. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one B(2) and two equivalent Bi(1) atoms. In the ninth O site, O(9) is bonded in a bent 120 degrees geometry to one B(1) and one B(5) atom. In the tenth O site, O(10) is bonded in a distorted bent 120 degrees geometry to one B(2), one B(6), and one Bi(1) atom. In the eleventh O site, O(11) is bonded in a bent 120 degrees geometry to one B(6) and one B(8) atom. In the twelfth O site, O(12) is bonded in a bent 120 degrees geometry to one B(6) and one B(7) atom. In the thirteenth O site, O(13) is bonded in a bent 120 degrees geometry to one B(5) and one B(8) atom. In the fourteenth O site, O(14) is bonded in a bent 120 degrees geometry to one B(7) and one B(8) atom. In the fifteenth O site, O(15) is bonded in a bent 120 degrees geometry to one B(5) and one B(7) atom. is represented by the CIF file [CIF]
data_Bi2B8O15
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.302
_cell_length_b   6.458
_cell_length_c   22.128
_cell_angle_alpha   87.644
_cell_angle_beta   88.346
_cell_angle_gamma   74.901
_symmetry_Int_Tables_number   1
_cell_volume   592.917
_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
  Bi  Bi0  1  0.114  0.623  0.931  1.0
  Bi  Bi1  1  0.886  0.377  0.069  1.0
  Bi  Bi2  1  0.599  0.101  0.570  1.0
  Bi  Bi3  1  0.401  0.899  0.430  1.0
  B  B4  1  0.660  0.312  0.431  1.0
  B  B5  1  0.340  0.688  0.569  1.0
  B  B6  1  0.853  0.214  0.927  1.0
  B  B7  1  0.147  0.786  0.073  1.0
  B  B8  1  0.920  0.470  0.568  1.0
  B  B9  1  0.080  0.530  0.432  1.0
  B  B10  1  0.433  0.995  0.930  1.0
  B  B11  1  0.567  0.005  0.070  1.0
  B  B12  1  0.370  0.669  0.683  1.0
  B  B13  1  0.630  0.331  0.317  1.0
  B  B14  1  0.959  0.746  0.183  1.0
  B  B15  1  0.041  0.254  0.817  1.0
  B  B16  1  0.710  0.033  0.247  1.0
  B  B17  1  0.290  0.967  0.753  1.0
  B  B18  1  0.314  0.322  0.726  1.0
  B  B19  1  0.686  0.678  0.274  1.0
  O  O20  1  0.594  0.488  0.563  1.0
  O  O21  1  0.406  0.512  0.437  1.0
  O  O22  1  0.104  0.012  0.934  1.0
  O  O23  1  0.896  0.988  0.066  1.0
  O  O24  1  0.536  0.177  0.928  1.0
  O  O25  1  0.464  0.823  0.072  1.0
  O  O26  1  0.611  0.789  0.928  1.0
  O  O27  1  0.389  0.211  0.072  1.0
  O  O28  1  0.025  0.650  0.565  1.0
  O  O29  1  0.975  0.350  0.435  1.0
  O  O30  1  0.095  0.264  0.576  1.0
  O  O31  1  0.905  0.736  0.424  1.0
  O  O32  1  0.626  0.141  0.473  1.0
  O  O33  1  0.374  0.859  0.527  1.0
  O  O34  1  0.125  0.631  0.028  1.0
  O  O35  1  0.875  0.369  0.972  1.0
  O  O36  1  0.364  0.779  0.630  1.0
  O  O37  1  0.636  0.221  0.370  1.0
  O  O38  1  0.102  0.669  0.131  1.0
  O  O39  1  0.898  0.331  0.869  1.0
  O  O40  1  0.880  0.604  0.225  1.0
  O  O41  1  0.120  0.396  0.775  1.0
  O  O42  1  0.883  0.962  0.196  1.0
  O  O43  1  0.117  0.038  0.804  1.0
  O  O44  1  0.411  0.450  0.684  1.0
  O  O45  1  0.589  0.550  0.316  1.0
  O  O46  1  0.416  0.105  0.717  1.0
  O  O47  1  0.584  0.895  0.283  1.0
  O  O48  1  0.667  0.239  0.262  1.0
  O  O49  1  0.333  0.761  0.738  1.0
[/CIF]
.
The crystal structure described by Bi2B8O15 crystallizes in the triclinic P-1 space group. There are eight inequivalent B sites. In the first B site, B(1) is bonded in a tetrahedral geometry to one O(1), one O(5), one O(7), and one O(9) atom. In the second B site, B(2) is bonded in a tetrahedral geometry to one O(10), one O(2), one O(3), and one O(8) atom. In the third B site, B(3) is bonded in a trigonal planar geometry to one O(1), one O(5), and one O(6) atom. In the fourth B site, B(4) is bonded in a trigonal planar geometry to one O(2), one O(3), and one O(4) atom. In the fifth B site, B(5) is bonded in a trigonal planar geometry to one O(13), one O(15), and one O(9) atom. In the sixth B site, B(6) is bonded in a trigonal planar geometry to one O(10), one O(11), and one O(12) atom. In the seventh B site, B(7) is bonded in a trigonal planar geometry to one O(12), one O(14), and one O(15) atom. In the eighth B site, B(8) is bonded in a trigonal planar geometry to one O(11), one O(13), and one O(14) atom. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 6-coordinate geometry to one O(10), one O(2), two equivalent O(4), and two equivalent O(8) atoms. In the second Bi site, Bi(2) is bonded in a 5-coordinate geometry to one O(1), two equivalent O(6), and two equivalent O(7) atoms. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one B(1), one B(3), and one Bi(2) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one B(2), one B(4), and one Bi(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one B(2) and one B(4) atom. In the fourth O site, O(4) is bonded in a 1-coordinate geometry to one B(4) and two equivalent Bi(1) atoms. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one B(1) and one B(3) atom. In the sixth O site, O(6) is bonded in a 1-coordinate geometry to one B(3) and two equivalent Bi(2) atoms. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one B(1) and two equivalent Bi(2) atoms. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one B(2) and two equivalent Bi(1) atoms. In the ninth O site, O(9) is bonded in a bent 120 degrees geometry to one B(1) and one B(5) atom. In the tenth O site, O(10) is bonded in a distorted bent 120 degrees geometry to one B(2), one B(6), and one Bi(1) atom. In the eleventh O site, O(11) is bonded in a bent 120 degrees geometry to one B(6) and one B(8) atom. In the twelfth O site, O(12) is bonded in a bent 120 degrees geometry to one B(6) and one B(7) atom. In the thirteenth O site, O(13) is bonded in a bent 120 degrees geometry to one B(5) and one B(8) atom. In the fourteenth O site, O(14) is bonded in a bent 120 degrees geometry to one B(7) and one B(8) atom. In the fifteenth O site, O(15) is bonded in a bent 120 degrees geometry to one B(5) and one B(7) atom. is represented by the CIF file [CIF]
data_Bi2B8O15
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.302
_cell_length_b   6.458
_cell_length_c   22.128
_cell_angle_alpha   87.644
_cell_angle_beta   88.346
_cell_angle_gamma   74.901
_symmetry_Int_Tables_number   1
_cell_volume   592.917
_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
  Bi  Bi0  1  0.114  0.623  0.931  1.0
  Bi  Bi1  1  0.886  0.377  0.069  1.0
  Bi  Bi2  1  0.599  0.101  0.570  1.0
  Bi  Bi3  1  0.401  0.899  0.430  1.0
  B  B4  1  0.660  0.312  0.431  1.0
  B  B5  1  0.340  0.688  0.569  1.0
  B  B6  1  0.853  0.214  0.927  1.0
  B  B7  1  0.147  0.786  0.073  1.0
  B  B8  1  0.920  0.470  0.568  1.0
  B  B9  1  0.080  0.530  0.432  1.0
  B  B10  1  0.433  0.995  0.930  1.0
  B  B11  1  0.567  0.005  0.070  1.0
  B  B12  1  0.370  0.669  0.683  1.0
  B  B13  1  0.630  0.331  0.317  1.0
  B  B14  1  0.959  0.746  0.183  1.0
  B  B15  1  0.041  0.254  0.817  1.0
  B  B16  1  0.710  0.033  0.247  1.0
  B  B17  1  0.290  0.967  0.753  1.0
  B  B18  1  0.314  0.322  0.726  1.0
  B  B19  1  0.686  0.678  0.274  1.0
  O  O20  1  0.594  0.488  0.563  1.0
  O  O21  1  0.406  0.512  0.437  1.0
  O  O22  1  0.104  0.012  0.934  1.0
  O  O23  1  0.896  0.988  0.066  1.0
  O  O24  1  0.536  0.177  0.928  1.0
  O  O25  1  0.464  0.823  0.072  1.0
  O  O26  1  0.611  0.789  0.928  1.0
  O  O27  1  0.389  0.211  0.072  1.0
  O  O28  1  0.025  0.650  0.565  1.0
  O  O29  1  0.975  0.350  0.435  1.0
  O  O30  1  0.095  0.264  0.576  1.0
  O  O31  1  0.905  0.736  0.424  1.0
  O  O32  1  0.626  0.141  0.473  1.0
  O  O33  1  0.374  0.859  0.527  1.0
  O  O34  1  0.125  0.631  0.028  1.0
  O  O35  1  0.875  0.369  0.972  1.0
  O  O36  1  0.364  0.779  0.630  1.0
  O  O37  1  0.636  0.221  0.370  1.0
  O  O38  1  0.102  0.669  0.131  1.0
  O  O39  1  0.898  0.331  0.869  1.0
  O  O40  1  0.880  0.604  0.225  1.0
  O  O41  1  0.120  0.396  0.775  1.0
  O  O42  1  0.883  0.962  0.196  1.0
  O  O43  1  0.117  0.038  0.804  1.0
  O  O44  1  0.411  0.450  0.684  1.0
  O  O45  1  0.589  0.550  0.316  1.0
  O  O46  1  0.416  0.105  0.717  1.0
  O  O47  1  0.584  0.895  0.283  1.0
  O  O48  1  0.667  0.239  0.262  1.0
  O  O49  1  0.333  0.761  0.738  1.0
[/CIF]
.