The compound described by Bi2B8O15 crystallizes in the monoclinic P2_1 space group. There are eight inequivalent B sites. In the first B site, B(1) is bonded in a trigonal planar geometry to one O(1), one O(14), and one O(2) atom. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(1), one O(15), and one O(3) atom. In the third B site, B(3) is bonded in a trigonal planar geometry to one O(2), one O(3), and one O(4) atom. In the fourth B site, B(4) is bonded in a tetrahedral geometry to one O(4), one O(5), one O(6), and one O(8) atom. In the fifth B site, B(5) is bonded in a trigonal planar geometry to one O(5), one O(7), and one O(8) atom. In the sixth B site, B(6) is bonded in a tetrahedral geometry to one O(11), one O(12), one O(13), and one O(9) atom. In the seventh B site, B(7) is bonded in a trigonal planar geometry to one O(10), one O(12), and one O(9) atom. In the eighth B site, B(8) is bonded in a trigonal planar geometry to one O(13), one O(14), and one O(15) atom. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 5-coordinate geometry to one O(11), one O(6), one O(9), and two equivalent O(10) atoms. In the second Bi site, Bi(2) is bonded in a 6-coordinate geometry to one O(11), one O(4), one O(6), one O(8), and two equivalent O(7) atoms. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one B(1) and one B(2) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one B(1) and one B(3) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one B(2) and one B(3) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one B(3), one B(4), and one Bi(2) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one B(4) and one B(5) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one B(4), one Bi(1), and one Bi(2) atom. In the seventh O site, O(7) is bonded in a 1-coordinate geometry to one B(5) and two equivalent Bi(2) atoms. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one B(4), one B(5), and one Bi(2) atom. In the ninth O site, O(9) is bonded in a distorted bent 120 degrees geometry to one B(6), one B(7), and one Bi(1) atom. In the tenth O site, O(10) is bonded in a 1-coordinate geometry to one B(7) and two equivalent Bi(1) atoms. In the eleventh O site, O(11) is bonded in a distorted single-bond geometry to one B(6), one Bi(1), and one Bi(2) 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(6) and one B(8) atom. In the fourteenth O site, O(14) is bonded in a bent 120 degrees geometry to one B(1) and one B(8) atom. In the fifteenth O site, O(15) is bonded in a bent 120 degrees geometry to one B(2) and one B(8) atom. is represented by the CIF file [CIF]
data_Bi2B8O15
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   22.196
_cell_length_b   4.311
_cell_length_c   6.470
_cell_angle_alpha   74.793
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   597.464
_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  0.354  0.823  0.332  1.0
  Bi  Bi1  1  0.854  0.177  0.668  1.0
  Bi  Bi2  1  0.216  0.606  0.108  1.0
  Bi  Bi3  1  0.716  0.394  0.892  1.0
  B  B4  1  0.011  0.438  0.431  1.0
  B  B5  1  0.511  0.562  0.569  1.0
  B  B6  1  0.038  0.462  0.782  1.0
  B  B7  1  0.538  0.538  0.218  1.0
  B  B8  1  0.103  0.696  0.487  1.0
  B  B9  1  0.603  0.304  0.513  1.0
  B  B10  1  0.213  0.866  0.517  1.0
  B  B11  1  0.713  0.134  0.483  1.0
  B  B12  1  0.215  0.286  0.735  1.0
  B  B13  1  0.715  0.714  0.265  1.0
  B  B14  1  0.855  0.437  0.082  1.0
  B  B15  1  0.355  0.563  0.918  1.0
  B  B16  1  0.852  0.858  0.299  1.0
  B  B17  1  0.352  0.142  0.701  1.0
  B  B18  1  0.968  0.390  0.089  1.0
  B  B19  1  0.468  0.610  0.911  1.0
  O  O20  1  0.001  0.341  0.649  1.0
  O  O21  1  0.501  0.659  0.351  1.0
  O  O22  1  0.060  0.620  0.351  1.0
  O  O23  1  0.560  0.380  0.649  1.0
  O  O24  1  0.089  0.629  0.704  1.0
  O  O25  1  0.589  0.371  0.296  1.0
  O  O26  1  0.155  0.829  0.405  1.0
  O  O27  1  0.655  0.171  0.595  1.0
  O  O28  1  0.215  0.183  0.553  1.0
  O  O29  1  0.715  0.817  0.447  1.0
  O  O30  1  0.258  0.840  0.355  1.0
  O  O31  1  0.758  0.160  0.645  1.0
  O  O32  1  0.210  0.107  0.941  1.0
  O  O33  1  0.710  0.893  0.059  1.0
  O  O34  1  0.219  0.614  0.718  1.0
  O  O35  1  0.719  0.386  0.282  1.0
  O  O36  1  0.847  0.184  0.283  1.0
  O  O37  1  0.347  0.816  0.717  1.0
  O  O38  1  0.860  0.680  0.505  1.0
  O  O39  1  0.360  0.320  0.495  1.0
  O  O40  1  0.813  0.409  0.916  1.0
  O  O41  1  0.313  0.591  0.084  1.0
  O  O42  1  0.851  0.754  0.119  1.0
  O  O43  1  0.351  0.246  0.881  1.0
  O  O44  1  0.915  0.404  0.984  1.0
  O  O45  1  0.415  0.596  0.016  1.0
  O  O46  1  0.969  0.348  0.308  1.0
  O  O47  1  0.469  0.652  0.692  1.0
  O  O48  1  0.023  0.419  0.990  1.0
  O  O49  1  0.523  0.581  0.010  1.0
[/CIF]
.
The compound described by Bi2B8O15 crystallizes in the monoclinic P2_1 space group. There are eight inequivalent B sites. In the first B site, B(1) is bonded in a trigonal planar geometry to one O(1), one O(14), and one O(2) atom. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(1), one O(15), and one O(3) atom. In the third B site, B(3) is bonded in a trigonal planar geometry to one O(2), one O(3), and one O(4) atom. In the fourth B site, B(4) is bonded in a tetrahedral geometry to one O(4), one O(5), one O(6), and one O(8) atom. In the fifth B site, B(5) is bonded in a trigonal planar geometry to one O(5), one O(7), and one O(8) atom. In the sixth B site, B(6) is bonded in a tetrahedral geometry to one O(11), one O(12), one O(13), and one O(9) atom. In the seventh B site, B(7) is bonded in a trigonal planar geometry to one O(10), one O(12), and one O(9) atom. In the eighth B site, B(8) is bonded in a trigonal planar geometry to one O(13), one O(14), and one O(15) atom. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 5-coordinate geometry to one O(11), one O(6), one O(9), and two equivalent O(10) atoms. In the second Bi site, Bi(2) is bonded in a 6-coordinate geometry to one O(11), one O(4), one O(6), one O(8), and two equivalent O(7) atoms. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one B(1) and one B(2) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one B(1) and one B(3) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one B(2) and one B(3) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one B(3), one B(4), and one Bi(2) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one B(4) and one B(5) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one B(4), one Bi(1), and one Bi(2) atom. In the seventh O site, O(7) is bonded in a 1-coordinate geometry to one B(5) and two equivalent Bi(2) atoms. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one B(4), one B(5), and one Bi(2) atom. In the ninth O site, O(9) is bonded in a distorted bent 120 degrees geometry to one B(6), one B(7), and one Bi(1) atom. In the tenth O site, O(10) is bonded in a 1-coordinate geometry to one B(7) and two equivalent Bi(1) atoms. In the eleventh O site, O(11) is bonded in a distorted single-bond geometry to one B(6), one Bi(1), and one Bi(2) 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(6) and one B(8) atom. In the fourteenth O site, O(14) is bonded in a bent 120 degrees geometry to one B(1) and one B(8) atom. In the fifteenth O site, O(15) is bonded in a bent 120 degrees geometry to one B(2) and one B(8) atom. is represented by the CIF file [CIF]
data_Bi2B8O15
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   22.196
_cell_length_b   4.311
_cell_length_c   6.470
_cell_angle_alpha   74.793
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   597.464
_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  0.354  0.823  0.332  1.0
  Bi  Bi1  1  0.854  0.177  0.668  1.0
  Bi  Bi2  1  0.216  0.606  0.108  1.0
  Bi  Bi3  1  0.716  0.394  0.892  1.0
  B  B4  1  0.011  0.438  0.431  1.0
  B  B5  1  0.511  0.562  0.569  1.0
  B  B6  1  0.038  0.462  0.782  1.0
  B  B7  1  0.538  0.538  0.218  1.0
  B  B8  1  0.103  0.696  0.487  1.0
  B  B9  1  0.603  0.304  0.513  1.0
  B  B10  1  0.213  0.866  0.517  1.0
  B  B11  1  0.713  0.134  0.483  1.0
  B  B12  1  0.215  0.286  0.735  1.0
  B  B13  1  0.715  0.714  0.265  1.0
  B  B14  1  0.855  0.437  0.082  1.0
  B  B15  1  0.355  0.563  0.918  1.0
  B  B16  1  0.852  0.858  0.299  1.0
  B  B17  1  0.352  0.142  0.701  1.0
  B  B18  1  0.968  0.390  0.089  1.0
  B  B19  1  0.468  0.610  0.911  1.0
  O  O20  1  0.001  0.341  0.649  1.0
  O  O21  1  0.501  0.659  0.351  1.0
  O  O22  1  0.060  0.620  0.351  1.0
  O  O23  1  0.560  0.380  0.649  1.0
  O  O24  1  0.089  0.629  0.704  1.0
  O  O25  1  0.589  0.371  0.296  1.0
  O  O26  1  0.155  0.829  0.405  1.0
  O  O27  1  0.655  0.171  0.595  1.0
  O  O28  1  0.215  0.183  0.553  1.0
  O  O29  1  0.715  0.817  0.447  1.0
  O  O30  1  0.258  0.840  0.355  1.0
  O  O31  1  0.758  0.160  0.645  1.0
  O  O32  1  0.210  0.107  0.941  1.0
  O  O33  1  0.710  0.893  0.059  1.0
  O  O34  1  0.219  0.614  0.718  1.0
  O  O35  1  0.719  0.386  0.282  1.0
  O  O36  1  0.847  0.184  0.283  1.0
  O  O37  1  0.347  0.816  0.717  1.0
  O  O38  1  0.860  0.680  0.505  1.0
  O  O39  1  0.360  0.320  0.495  1.0
  O  O40  1  0.813  0.409  0.916  1.0
  O  O41  1  0.313  0.591  0.084  1.0
  O  O42  1  0.851  0.754  0.119  1.0
  O  O43  1  0.351  0.246  0.881  1.0
  O  O44  1  0.915  0.404  0.984  1.0
  O  O45  1  0.415  0.596  0.016  1.0
  O  O46  1  0.969  0.348  0.308  1.0
  O  O47  1  0.469  0.652  0.692  1.0
  O  O48  1  0.023  0.419  0.990  1.0
  O  O49  1  0.523  0.581  0.010  1.0
[/CIF]
.