The compound described by La5Si2BO13 crystallizes in the monoclinic Pm space group. There are eight inequivalent La sites. In the first La site, La(1) is bonded in a 7-coordinate geometry to one O(15), one O(19), one O(8), two equivalent O(1), and two equivalent O(6) atoms. In the second La site, La(2) is bonded in a 7-coordinate geometry to one O(13), one O(19), one O(9), two equivalent O(2), and two equivalent O(4) atoms. In the third La site, La(3) is bonded in a 7-coordinate geometry to one O(14), one O(19), one O(7), two equivalent O(3), and two equivalent O(5) atoms. In the fourth La site, La(4) is bonded in a 7-coordinate geometry to one O(11), one O(18), one O(20), two equivalent O(3), and two equivalent O(4) atoms. In the fifth La site, La(5) is bonded in a 7-coordinate geometry to one O(12), one O(16), one O(20), two equivalent O(1), and two equivalent O(5) atoms. In the sixth La site, La(6) is bonded in a 7-coordinate geometry to one O(10), one O(17), one O(20), two equivalent O(2), and two equivalent O(6) atoms. In the seventh La site, La(7) is bonded in a 9-coordinate geometry to one O(16), one O(17), one O(18), one O(4), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. In the eighth La site, La(8) is bonded in a 9-coordinate geometry to one O(1), one O(10), one O(11), one O(12), one O(13), one O(14), one O(15), one O(2), and one O(3) atom. There are two inequivalent B sites. In the first B site, B(1) is bonded in a tetrahedral geometry to one O(13), one O(7), and two equivalent O(1) atoms. In the second B site, B(2) is bonded in a tetrahedral geometry to one O(11), one O(17), and two equivalent O(5) atoms. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded in a tetrahedral geometry to one O(14), one O(8), and two equivalent O(2) atoms. In the second Si site, Si(2) is bonded in a tetrahedral geometry to one O(15), one O(9), and two equivalent O(3) atoms. In the third Si site, Si(3) is bonded in a tetrahedral geometry to one O(10), one O(16), and two equivalent O(4) atoms. In the fourth Si site, Si(4) is bonded in a tetrahedral geometry to one O(12), one O(18), and two equivalent O(6) atoms. There are twenty inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one La(1), one La(5), one La(8), and one B(1) atom. In the second O site, O(2) is bonded in a 1-coordinate geometry to one La(2), one La(6), one La(8), and one Si(1) atom. In the third O site, O(3) is bonded in a 1-coordinate geometry to one La(3), one La(4), one La(8), and one Si(2) atom. In the fourth O site, O(4) is bonded in a 1-coordinate geometry to one La(2), one La(4), one La(7), and one Si(3) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one La(3), one La(5), one La(7), and one B(2) atom. In the sixth O site, O(6) is bonded in a 1-coordinate geometry to one La(1), one La(6), one La(7), and one Si(4) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one La(3), two equivalent La(7), and one B(1) atom. In the eighth O site, O(8) is bonded in a 1-coordinate geometry to one La(1), two equivalent La(7), and one Si(1) atom. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to one La(2), two equivalent La(7), and one Si(2) atom. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one La(6), two equivalent La(8), and one Si(3) atom. In the eleventh O site, O(11) is bonded in a distorted single-bond geometry to one La(4), two equivalent La(8), and one B(2) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one La(5), two equivalent La(8), and one Si(4) atom. In the thirteenth O site, O(13) is bonded in a distorted single-bond geometry to one La(2), two equivalent La(8), and one B(1) atom. In the fourteenth O site, O(14) is bonded in a distorted single-bond geometry to one La(3), two equivalent La(8), and one Si(1) atom. In the fifteenth O site, O(15) is bonded in a distorted tetrahedral geometry to one La(1), two equivalent La(8), and one Si(2) atom. In the sixteenth O site, O(16) is bonded in a distorted tetrahedral geometry to one La(5), two equivalent La(7), and one Si(3) atom. In the seventeenth O site, O(17) is bonded in a distorted single-bond geometry to one La(6), two equivalent La(7), and one B(2) atom. In the eighteenth O site, O(18) is bonded in a distorted single-bond geometry to one La(4), two equivalent La(7), and one Si(4) atom. In the nineteenth O site, O(19) is bonded in a trigonal planar geometry to one La(1), one La(2), and one La(3) atom. In the twentieth O site, O(20) is bonded in a trigonal planar geometry to one La(4), one La(5), and one La(6) atom. is represented by the CIF file [CIF]
data_La5Si2BO13
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.254
_cell_length_b   9.606
_cell_length_c   9.612
_cell_angle_alpha   60.122
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   580.809
_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
  La  La0  1  0.500  0.994  0.768  1.0
  La  La1  1  0.500  0.240  0.013  1.0
  La  La2  1  0.500  0.749  0.224  1.0
  La  La3  1  0.000  0.972  0.249  1.0
  La  La4  1  0.000  0.761  0.001  1.0
  La  La5  1  0.000  0.250  0.759  1.0
  La  La6  1  0.752  0.350  0.327  1.0
  La  La7  1  0.252  0.665  0.671  1.0
  La  La8  1  0.748  0.665  0.671  1.0
  La  La9  1  0.248  0.350  0.327  1.0
  Si  Si10  1  0.500  0.402  0.629  1.0
  Si  Si11  1  0.500  0.971  0.399  1.0
  Si  Si12  1  0.000  0.366  0.032  1.0
  Si  Si13  1  0.000  0.033  0.596  1.0
  B  B14  1  0.500  0.631  0.966  1.0
  B  B15  1  0.000  0.598  0.372  1.0
  O  O16  1  0.670  0.737  0.915  1.0
  O  O17  1  0.682  0.346  0.747  1.0
  O  O18  1  0.683  0.909  0.344  1.0
  O  O19  1  0.183  0.252  0.091  1.0
  O  O20  1  0.170  0.651  0.263  1.0
  O  O21  1  0.183  0.092  0.655  1.0
  O  O22  1  0.817  0.252  0.091  1.0
  O  O23  1  0.830  0.651  0.263  1.0
  O  O24  1  0.817  0.092  0.655  1.0
  O  O25  1  0.330  0.737  0.915  1.0
  O  O26  1  0.318  0.346  0.747  1.0
  O  O27  1  0.317  0.909  0.344  1.0
  O  O28  1  0.500  0.521  0.146  1.0
  O  O29  1  0.500  0.328  0.510  1.0
  O  O30  1  0.500  0.165  0.325  1.0
  O  O31  1  0.000  0.487  0.838  1.0
  O  O32  1  0.000  0.665  0.482  1.0
  O  O33  1  0.000  0.837  0.673  1.0
  O  O34  1  0.500  0.538  0.877  1.0
  O  O35  1  0.500  0.599  0.529  1.0
  O  O36  1  0.500  0.872  0.597  1.0
  O  O37  1  0.000  0.469  0.127  1.0
  O  O38  1  0.000  0.415  0.462  1.0
  O  O39  1  0.000  0.130  0.399  1.0
  O  O40  1  0.500  0.001  0.004  1.0
  O  O41  1  0.000  0.004  0.996  1.0
[/CIF]
.
The compound described by La5Si2BO13 crystallizes in the monoclinic Pm space group. There are eight inequivalent La sites. In the first La site, La(1) is bonded in a 7-coordinate geometry to one O(15), one O(19), one O(8), two equivalent O(1), and two equivalent O(6) atoms. In the second La site, La(2) is bonded in a 7-coordinate geometry to one O(13), one O(19), one O(9), two equivalent O(2), and two equivalent O(4) atoms. In the third La site, La(3) is bonded in a 7-coordinate geometry to one O(14), one O(19), one O(7), two equivalent O(3), and two equivalent O(5) atoms. In the fourth La site, La(4) is bonded in a 7-coordinate geometry to one O(11), one O(18), one O(20), two equivalent O(3), and two equivalent O(4) atoms. In the fifth La site, La(5) is bonded in a 7-coordinate geometry to one O(12), one O(16), one O(20), two equivalent O(1), and two equivalent O(5) atoms. In the sixth La site, La(6) is bonded in a 7-coordinate geometry to one O(10), one O(17), one O(20), two equivalent O(2), and two equivalent O(6) atoms. In the seventh La site, La(7) is bonded in a 9-coordinate geometry to one O(16), one O(17), one O(18), one O(4), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. In the eighth La site, La(8) is bonded in a 9-coordinate geometry to one O(1), one O(10), one O(11), one O(12), one O(13), one O(14), one O(15), one O(2), and one O(3) atom. There are two inequivalent B sites. In the first B site, B(1) is bonded in a tetrahedral geometry to one O(13), one O(7), and two equivalent O(1) atoms. In the second B site, B(2) is bonded in a tetrahedral geometry to one O(11), one O(17), and two equivalent O(5) atoms. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded in a tetrahedral geometry to one O(14), one O(8), and two equivalent O(2) atoms. In the second Si site, Si(2) is bonded in a tetrahedral geometry to one O(15), one O(9), and two equivalent O(3) atoms. In the third Si site, Si(3) is bonded in a tetrahedral geometry to one O(10), one O(16), and two equivalent O(4) atoms. In the fourth Si site, Si(4) is bonded in a tetrahedral geometry to one O(12), one O(18), and two equivalent O(6) atoms. There are twenty inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one La(1), one La(5), one La(8), and one B(1) atom. In the second O site, O(2) is bonded in a 1-coordinate geometry to one La(2), one La(6), one La(8), and one Si(1) atom. In the third O site, O(3) is bonded in a 1-coordinate geometry to one La(3), one La(4), one La(8), and one Si(2) atom. In the fourth O site, O(4) is bonded in a 1-coordinate geometry to one La(2), one La(4), one La(7), and one Si(3) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one La(3), one La(5), one La(7), and one B(2) atom. In the sixth O site, O(6) is bonded in a 1-coordinate geometry to one La(1), one La(6), one La(7), and one Si(4) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one La(3), two equivalent La(7), and one B(1) atom. In the eighth O site, O(8) is bonded in a 1-coordinate geometry to one La(1), two equivalent La(7), and one Si(1) atom. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to one La(2), two equivalent La(7), and one Si(2) atom. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one La(6), two equivalent La(8), and one Si(3) atom. In the eleventh O site, O(11) is bonded in a distorted single-bond geometry to one La(4), two equivalent La(8), and one B(2) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one La(5), two equivalent La(8), and one Si(4) atom. In the thirteenth O site, O(13) is bonded in a distorted single-bond geometry to one La(2), two equivalent La(8), and one B(1) atom. In the fourteenth O site, O(14) is bonded in a distorted single-bond geometry to one La(3), two equivalent La(8), and one Si(1) atom. In the fifteenth O site, O(15) is bonded in a distorted tetrahedral geometry to one La(1), two equivalent La(8), and one Si(2) atom. In the sixteenth O site, O(16) is bonded in a distorted tetrahedral geometry to one La(5), two equivalent La(7), and one Si(3) atom. In the seventeenth O site, O(17) is bonded in a distorted single-bond geometry to one La(6), two equivalent La(7), and one B(2) atom. In the eighteenth O site, O(18) is bonded in a distorted single-bond geometry to one La(4), two equivalent La(7), and one Si(4) atom. In the nineteenth O site, O(19) is bonded in a trigonal planar geometry to one La(1), one La(2), and one La(3) atom. In the twentieth O site, O(20) is bonded in a trigonal planar geometry to one La(4), one La(5), and one La(6) atom. is represented by the CIF file [CIF]
data_La5Si2BO13
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.254
_cell_length_b   9.606
_cell_length_c   9.612
_cell_angle_alpha   60.122
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   580.809
_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
  La  La0  1  0.500  0.994  0.768  1.0
  La  La1  1  0.500  0.240  0.013  1.0
  La  La2  1  0.500  0.749  0.224  1.0
  La  La3  1  0.000  0.972  0.249  1.0
  La  La4  1  0.000  0.761  0.001  1.0
  La  La5  1  0.000  0.250  0.759  1.0
  La  La6  1  0.752  0.350  0.327  1.0
  La  La7  1  0.252  0.665  0.671  1.0
  La  La8  1  0.748  0.665  0.671  1.0
  La  La9  1  0.248  0.350  0.327  1.0
  Si  Si10  1  0.500  0.402  0.629  1.0
  Si  Si11  1  0.500  0.971  0.399  1.0
  Si  Si12  1  0.000  0.366  0.032  1.0
  Si  Si13  1  0.000  0.033  0.596  1.0
  B  B14  1  0.500  0.631  0.966  1.0
  B  B15  1  0.000  0.598  0.372  1.0
  O  O16  1  0.670  0.737  0.915  1.0
  O  O17  1  0.682  0.346  0.747  1.0
  O  O18  1  0.683  0.909  0.344  1.0
  O  O19  1  0.183  0.252  0.091  1.0
  O  O20  1  0.170  0.651  0.263  1.0
  O  O21  1  0.183  0.092  0.655  1.0
  O  O22  1  0.817  0.252  0.091  1.0
  O  O23  1  0.830  0.651  0.263  1.0
  O  O24  1  0.817  0.092  0.655  1.0
  O  O25  1  0.330  0.737  0.915  1.0
  O  O26  1  0.318  0.346  0.747  1.0
  O  O27  1  0.317  0.909  0.344  1.0
  O  O28  1  0.500  0.521  0.146  1.0
  O  O29  1  0.500  0.328  0.510  1.0
  O  O30  1  0.500  0.165  0.325  1.0
  O  O31  1  0.000  0.487  0.838  1.0
  O  O32  1  0.000  0.665  0.482  1.0
  O  O33  1  0.000  0.837  0.673  1.0
  O  O34  1  0.500  0.538  0.877  1.0
  O  O35  1  0.500  0.599  0.529  1.0
  O  O36  1  0.500  0.872  0.597  1.0
  O  O37  1  0.000  0.469  0.127  1.0
  O  O38  1  0.000  0.415  0.462  1.0
  O  O39  1  0.000  0.130  0.399  1.0
  O  O40  1  0.500  0.001  0.004  1.0
  O  O41  1  0.000  0.004  0.996  1.0
[/CIF]
.