The structure described by Ca2B8O15 crystallizes in the triclinic P-1 space group. There are two inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 1-coordinate geometry to one B(8), one O(1), one O(15), and one O(5) atom. In the second Ca site, Ca(2) is bonded in a 7-coordinate geometry to one B(7), one O(10), one O(11), one O(14), one O(3), and two equivalent O(6) atoms. There are eight inequivalent B sites. In the first B site, B(1) is bonded in a 3-coordinate geometry to one O(13), one O(7), and one O(8) atom. In the second B site, B(2) is bonded in a 3-coordinate geometry to one O(1), one O(14), and one O(2) atom. In the third B site, B(3) is bonded in a distorted trigonal planar geometry to one O(1), one O(3), and one O(4) atom. In the fourth B site, B(4) is bonded in a 3-coordinate geometry to one O(10), one O(8), and one O(9) atom. In the fifth B site, B(5) is bonded in a 3-coordinate geometry to one O(14), one O(15), and one O(4) atom. In the sixth B site, B(6) is bonded in a 3-coordinate geometry to one O(11), one O(15), and one O(7) atom. In the seventh B site, B(7) is bonded in a 2-coordinate geometry to one Ca(2), one O(11), one O(2), one O(3), and one O(6) atom. In the eighth B site, B(8) is bonded in a 5-coordinate geometry to one Ca(1), one O(12), one O(13), one O(5), and one O(9) atom. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Ca(1), one B(2), and one B(3) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one B(2) and one B(7) atom. In the third O site, O(3) is bonded in an L-shaped geometry to one Ca(2), one B(3), and one B(7) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to one B(3) and one B(5) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one Ca(1) and one B(8) atom. In the sixth O site, O(6) is bonded in a 1-coordinate geometry to two equivalent Ca(2) and one B(7) atom. In the seventh O site, O(7) is bonded in a distorted bent 120 degrees geometry to one B(1) and one B(6) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one B(1) and one B(4) atom. In the ninth O site, O(9) is bonded in a water-like geometry to one B(4) and one B(8) atom. In the tenth O site, O(10) is bonded in a distorted single-bond geometry to one Ca(2) and one B(4) atom. In the eleventh O site, O(11) is bonded in a 3-coordinate geometry to one Ca(2), one B(6), and one B(7) atom. In the twelfth O site, O(12) is bonded in a single-bond geometry to one B(8) atom. In the thirteenth O site, O(13) is bonded in a 2-coordinate geometry to one B(1) and one B(8) atom. In the fourteenth O site, O(14) is bonded in a 2-coordinate geometry to one Ca(2), one B(2), and one B(5) atom. In the fifteenth O site, O(15) is bonded in a 3-coordinate geometry to one Ca(1), one B(5), and one B(6) atom. is represented by the CIF file [CIF]
data_Ca2B8O15
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.498
_cell_length_b   9.445
_cell_length_c   10.164
_cell_angle_alpha   117.006
_cell_angle_beta   90.518
_cell_angle_gamma   99.891
_symmetry_Int_Tables_number   1
_cell_volume   544.802
_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
  Ca  Ca0  1  0.519  0.462  0.720  1.0
  Ca  Ca1  1  0.481  0.538  0.280  1.0
  Ca  Ca2  1  0.840  0.013  0.172  1.0
  Ca  Ca3  1  0.160  0.987  0.828  1.0
  B  B4  1  0.248  0.846  0.219  1.0
  B  B5  1  0.752  0.154  0.781  1.0
  B  B6  1  0.581  0.278  0.127  1.0
  B  B7  1  0.419  0.722  0.873  1.0
  B  B8  1  0.235  0.312  0.157  1.0
  B  B9  1  0.765  0.688  0.843  1.0
  B  B10  1  0.201  0.783  0.478  1.0
  B  B11  1  0.799  0.217  0.522  1.0
  B  B12  1  0.075  0.653  0.736  1.0
  B  B13  1  0.925  0.347  0.264  1.0
  B  B14  1  0.055  0.347  0.808  1.0
  B  B15  1  0.945  0.653  0.192  1.0
  B  B16  1  0.270  0.149  0.025  1.0
  B  B17  1  0.730  0.851  0.975  1.0
  B  B18  1  0.554  0.755  0.428  1.0
  B  B19  1  0.446  0.245  0.572  1.0
  O  O20  1  0.452  0.364  0.152  1.0
  O  O21  1  0.548  0.636  0.848  1.0
  O  O22  1  0.499  0.193  0.048  1.0
  O  O23  1  0.501  0.807  0.952  1.0
  O  O24  1  0.149  0.204  0.104  1.0
  O  O25  1  0.851  0.796  0.896  1.0
  O  O26  1  0.140  0.377  0.220  1.0
  O  O27  1  0.860  0.623  0.780  1.0
  O  O28  1  0.655  0.612  0.477  1.0
  O  O29  1  0.345  0.388  0.523  1.0
  O  O30  1  0.218  0.979  0.071  1.0
  O  O31  1  0.782  0.021  0.929  1.0
  O  O32  1  0.158  0.690  0.214  1.0
  O  O33  1  0.842  0.310  0.786  1.0
  O  O34  1  0.143  0.865  0.327  1.0
  O  O35  1  0.857  0.135  0.673  1.0
  O  O36  1  0.396  0.722  0.527  1.0
  O  O37  1  0.604  0.278  0.473  1.0
  O  O38  1  0.070  0.761  0.578  1.0
  O  O39  1  0.930  0.239  0.422  1.0
  O  O40  1  0.197  0.230  0.863  1.0
  O  O41  1  0.803  0.770  0.137  1.0
  O  O42  1  0.715  0.889  0.411  1.0
  O  O43  1  0.285  0.111  0.589  1.0
  O  O44  1  0.473  0.822  0.268  1.0
  O  O45  1  0.527  0.178  0.732  1.0
  O  O46  1  0.787  0.269  0.178  1.0
  O  O47  1  0.213  0.731  0.822  1.0
  O  O48  1  0.151  0.499  0.774  1.0
  O  O49  1  0.849  0.501  0.226  1.0
[/CIF]
.
The structure described by Ca2B8O15 crystallizes in the triclinic P-1 space group. There are two inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 1-coordinate geometry to one B(8), one O(1), one O(15), and one O(5) atom. In the second Ca site, Ca(2) is bonded in a 7-coordinate geometry to one B(7), one O(10), one O(11), one O(14), one O(3), and two equivalent O(6) atoms. There are eight inequivalent B sites. In the first B site, B(1) is bonded in a 3-coordinate geometry to one O(13), one O(7), and one O(8) atom. In the second B site, B(2) is bonded in a 3-coordinate geometry to one O(1), one O(14), and one O(2) atom. In the third B site, B(3) is bonded in a distorted trigonal planar geometry to one O(1), one O(3), and one O(4) atom. In the fourth B site, B(4) is bonded in a 3-coordinate geometry to one O(10), one O(8), and one O(9) atom. In the fifth B site, B(5) is bonded in a 3-coordinate geometry to one O(14), one O(15), and one O(4) atom. In the sixth B site, B(6) is bonded in a 3-coordinate geometry to one O(11), one O(15), and one O(7) atom. In the seventh B site, B(7) is bonded in a 2-coordinate geometry to one Ca(2), one O(11), one O(2), one O(3), and one O(6) atom. In the eighth B site, B(8) is bonded in a 5-coordinate geometry to one Ca(1), one O(12), one O(13), one O(5), and one O(9) atom. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Ca(1), one B(2), and one B(3) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one B(2) and one B(7) atom. In the third O site, O(3) is bonded in an L-shaped geometry to one Ca(2), one B(3), and one B(7) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to one B(3) and one B(5) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one Ca(1) and one B(8) atom. In the sixth O site, O(6) is bonded in a 1-coordinate geometry to two equivalent Ca(2) and one B(7) atom. In the seventh O site, O(7) is bonded in a distorted bent 120 degrees geometry to one B(1) and one B(6) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one B(1) and one B(4) atom. In the ninth O site, O(9) is bonded in a water-like geometry to one B(4) and one B(8) atom. In the tenth O site, O(10) is bonded in a distorted single-bond geometry to one Ca(2) and one B(4) atom. In the eleventh O site, O(11) is bonded in a 3-coordinate geometry to one Ca(2), one B(6), and one B(7) atom. In the twelfth O site, O(12) is bonded in a single-bond geometry to one B(8) atom. In the thirteenth O site, O(13) is bonded in a 2-coordinate geometry to one B(1) and one B(8) atom. In the fourteenth O site, O(14) is bonded in a 2-coordinate geometry to one Ca(2), one B(2), and one B(5) atom. In the fifteenth O site, O(15) is bonded in a 3-coordinate geometry to one Ca(1), one B(5), and one B(6) atom. is represented by the CIF file [CIF]
data_Ca2B8O15
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.498
_cell_length_b   9.445
_cell_length_c   10.164
_cell_angle_alpha   117.006
_cell_angle_beta   90.518
_cell_angle_gamma   99.891
_symmetry_Int_Tables_number   1
_cell_volume   544.802
_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
  Ca  Ca0  1  0.519  0.462  0.720  1.0
  Ca  Ca1  1  0.481  0.538  0.280  1.0
  Ca  Ca2  1  0.840  0.013  0.172  1.0
  Ca  Ca3  1  0.160  0.987  0.828  1.0
  B  B4  1  0.248  0.846  0.219  1.0
  B  B5  1  0.752  0.154  0.781  1.0
  B  B6  1  0.581  0.278  0.127  1.0
  B  B7  1  0.419  0.722  0.873  1.0
  B  B8  1  0.235  0.312  0.157  1.0
  B  B9  1  0.765  0.688  0.843  1.0
  B  B10  1  0.201  0.783  0.478  1.0
  B  B11  1  0.799  0.217  0.522  1.0
  B  B12  1  0.075  0.653  0.736  1.0
  B  B13  1  0.925  0.347  0.264  1.0
  B  B14  1  0.055  0.347  0.808  1.0
  B  B15  1  0.945  0.653  0.192  1.0
  B  B16  1  0.270  0.149  0.025  1.0
  B  B17  1  0.730  0.851  0.975  1.0
  B  B18  1  0.554  0.755  0.428  1.0
  B  B19  1  0.446  0.245  0.572  1.0
  O  O20  1  0.452  0.364  0.152  1.0
  O  O21  1  0.548  0.636  0.848  1.0
  O  O22  1  0.499  0.193  0.048  1.0
  O  O23  1  0.501  0.807  0.952  1.0
  O  O24  1  0.149  0.204  0.104  1.0
  O  O25  1  0.851  0.796  0.896  1.0
  O  O26  1  0.140  0.377  0.220  1.0
  O  O27  1  0.860  0.623  0.780  1.0
  O  O28  1  0.655  0.612  0.477  1.0
  O  O29  1  0.345  0.388  0.523  1.0
  O  O30  1  0.218  0.979  0.071  1.0
  O  O31  1  0.782  0.021  0.929  1.0
  O  O32  1  0.158  0.690  0.214  1.0
  O  O33  1  0.842  0.310  0.786  1.0
  O  O34  1  0.143  0.865  0.327  1.0
  O  O35  1  0.857  0.135  0.673  1.0
  O  O36  1  0.396  0.722  0.527  1.0
  O  O37  1  0.604  0.278  0.473  1.0
  O  O38  1  0.070  0.761  0.578  1.0
  O  O39  1  0.930  0.239  0.422  1.0
  O  O40  1  0.197  0.230  0.863  1.0
  O  O41  1  0.803  0.770  0.137  1.0
  O  O42  1  0.715  0.889  0.411  1.0
  O  O43  1  0.285  0.111  0.589  1.0
  O  O44  1  0.473  0.822  0.268  1.0
  O  O45  1  0.527  0.178  0.732  1.0
  O  O46  1  0.787  0.269  0.178  1.0
  O  O47  1  0.213  0.731  0.822  1.0
  O  O48  1  0.151  0.499  0.774  1.0
  O  O49  1  0.849  0.501  0.226  1.0
[/CIF]
.