The structure described by Al9BSi2O19 crystallizes in the monoclinic Cm space group. There are seven inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(14), one O(2), and two equivalent O(9) atoms to form AlO4 tetrahedra that share corners with two equivalent Al(3)O6 octahedra, corners with two equivalent Al(4)O6 octahedra,  a cornercorner with one Al(7)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and  a cornercorner with one Al(5)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 50-69°. In the second Al site, Al(2) is bonded to one O(1), one O(13), and two equivalent O(10) atoms to form distorted AlO4 tetrahedra that share corners with two equivalent Al(3)O6 octahedra, corners with two equivalent Al(4)O6 octahedra, and  a cornercorner with one Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 50-74°. In the third Al site, Al(3) is bonded to one O(1), one O(12), one O(3), one O(6), one O(7), and one O(9) atom to form AlO6 octahedra that share  a cornercorner with one Al(1)O4 tetrahedra,  a cornercorner with one Al(2)O4 tetrahedra,  a cornercorner with one Al(6)O4 tetrahedra,  a cornercorner with one Al(7)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Al(5)O5 trigonal bipyramid, and edges with two equivalent Al(3)O6 octahedra. In the fourth Al site, Al(4) is bonded to one O(10), one O(11), one O(2), one O(4), one O(5), and one O(8) atom to form AlO6 octahedra that share  a cornercorner with one Al(1)O4 tetrahedra,  a cornercorner with one Al(2)O4 tetrahedra,  a cornercorner with one Al(6)O4 tetrahedra,  a cornercorner with one Al(7)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, edges with two equivalent Al(4)O6 octahedra, and  an edgeedge with one Al(5)O5 trigonal bipyramid. In the fifth Al site, Al(5) is bonded to one O(14), one O(3), one O(8), and two equivalent O(11) atoms to form distorted AlO5 trigonal bipyramids that share corners with two equivalent Al(3)O6 octahedra,  a cornercorner with one Al(1)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, edges with two equivalent Al(4)O6 octahedra, and  an edgeedge with one Al(7)O4 tetrahedra. The corner-sharing octahedral tilt angles are 51°. In the sixth Al site, Al(6) is bonded to one O(15), one O(4), and two equivalent O(12) atoms to form AlO4 tetrahedra that share corners with two equivalent Al(3)O6 octahedra, corners with two equivalent Al(4)O6 octahedra,  a cornercorner with one Si(2)O4 tetrahedra, and corners with two equivalent Al(7)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 53-57°. In the seventh Al site, Al(7) is bonded to one O(14), one O(8), and two equivalent O(12) atoms to form AlO4 tetrahedra that share corners with two equivalent Al(3)O6 octahedra, corners with two equivalent Al(4)O6 octahedra,  a cornercorner with one Al(1)O4 tetrahedra, corners with two equivalent Al(6)O4 tetrahedra, and  an edgeedge with one Al(5)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 51-57°. B(1) is bonded in a trigonal planar geometry to one O(6) and two equivalent O(10) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(13), one O(7), and two equivalent O(11) atoms to form SiO4 tetrahedra that share corners with two equivalent Al(3)O6 octahedra, corners with two equivalent Al(4)O6 octahedra,  a cornercorner with one Al(2)O4 tetrahedra, and corners with two equivalent Al(5)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 51-54°. In the second Si site, Si(2) is bonded to one O(15), one O(5), and two equivalent O(9) atoms to form SiO4 tetrahedra that share corners with two equivalent Al(3)O6 octahedra, corners with two equivalent Al(4)O6 octahedra,  a cornercorner with one Al(6)O4 tetrahedra, and corners with two equivalent Al(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 50-55°. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Al(2) and two equivalent Al(3) atoms. In the second O site, O(2) is bonded in a trigonal planar geometry to one Al(1) and two equivalent Al(4) atoms. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Al(5) and two equivalent Al(3) atoms. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Al(6) and two equivalent Al(4) atoms. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to two equivalent Al(4) and one Si(2) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to two equivalent Al(3) and one B(1) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to two equivalent Al(3) and one Si(1) atom. In the eighth O site, O(8) is bonded in a trigonal pyramidal geometry to one Al(5), one Al(7), and two equivalent Al(4) atoms. In the ninth O site, O(9) is bonded in a trigonal planar geometry to one Al(1), one Al(3), and one Si(2) atom. In the tenth O site, O(10) is bonded in a trigonal planar geometry to one Al(2), one Al(4), and one B(1) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal planar geometry to one Al(4), one Al(5), and one Si(1) atom. In the twelfth O site, O(12) is bonded in a trigonal planar geometry to one Al(3), one Al(6), and one Al(7) atom. In the thirteenth O site, O(13) is bonded in a linear geometry to one Al(2) and one Si(1) atom. In the fourteenth O site, O(14) is bonded in a distorted trigonal non-coplanar geometry to one Al(1), one Al(5), and one Al(7) atom. In the fifteenth O site, O(15) is bonded in a linear geometry to one Al(6) and one Si(2) atom. is represented by the CIF file [CIF]
data_Al9Si2BO19
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.120
_cell_length_b   8.120
_cell_length_c   7.676
_cell_angle_alpha   87.790
_cell_angle_beta   87.790
_cell_angle_gamma   41.800
_symmetry_Int_Tables_number   1
_cell_volume   337.063
_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
  Al  Al0  1  0.551  0.551  0.833  1.0
  Al  Al1  1  0.438  0.438  0.314  1.0
  Al  Al2  1  0.379  0.865  0.164  1.0
  Al  Al3  1  0.865  0.379  0.164  1.0
  Al  Al4  1  0.629  0.136  0.650  1.0
  Al  Al5  1  0.136  0.629  0.650  1.0
  Al  Al6  1  0.747  0.747  0.853  1.0
  Al  Al7  1  0.204  0.204  0.493  1.0
  Al  Al8  1  0.703  0.703  0.497  1.0
  Si  Si9  1  0.296  0.296  0.996  1.0
  Si  Si10  1  0.049  0.049  0.819  1.0
  B  B11  1  0.977  0.977  0.363  1.0
  O  O12  1  0.549  0.549  0.237  1.0
  O  O13  1  0.456  0.456  0.710  1.0
  O  O14  1  0.686  0.686  0.056  1.0
  O  O15  1  0.319  0.319  0.546  1.0
  O  O16  1  0.951  0.951  0.736  1.0
  O  O17  1  0.050  0.050  0.252  1.0
  O  O18  1  0.192  0.192  0.073  1.0
  O  O19  1  0.806  0.806  0.608  1.0
  O  O20  1  0.284  0.822  0.945  1.0
  O  O21  1  0.822  0.284  0.945  1.0
  O  O22  1  0.729  0.149  0.421  1.0
  O  O23  1  0.149  0.729  0.421  1.0
  O  O24  1  0.539  0.079  0.867  1.0
  O  O25  1  0.079  0.539  0.867  1.0
  O  O26  1  0.441  0.933  0.372  1.0
  O  O27  1  0.933  0.441  0.372  1.0
  O  O28  1  0.365  0.365  0.147  1.0
  O  O29  1  0.651  0.651  0.709  1.0
  O  O30  1  0.125  0.125  0.667  1.0
[/CIF]
.
The structure described by Al9BSi2O19 crystallizes in the monoclinic Cm space group. There are seven inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(14), one O(2), and two equivalent O(9) atoms to form AlO4 tetrahedra that share corners with two equivalent Al(3)O6 octahedra, corners with two equivalent Al(4)O6 octahedra,  a cornercorner with one Al(7)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and  a cornercorner with one Al(5)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 50-69°. In the second Al site, Al(2) is bonded to one O(1), one O(13), and two equivalent O(10) atoms to form distorted AlO4 tetrahedra that share corners with two equivalent Al(3)O6 octahedra, corners with two equivalent Al(4)O6 octahedra, and  a cornercorner with one Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 50-74°. In the third Al site, Al(3) is bonded to one O(1), one O(12), one O(3), one O(6), one O(7), and one O(9) atom to form AlO6 octahedra that share  a cornercorner with one Al(1)O4 tetrahedra,  a cornercorner with one Al(2)O4 tetrahedra,  a cornercorner with one Al(6)O4 tetrahedra,  a cornercorner with one Al(7)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Al(5)O5 trigonal bipyramid, and edges with two equivalent Al(3)O6 octahedra. In the fourth Al site, Al(4) is bonded to one O(10), one O(11), one O(2), one O(4), one O(5), and one O(8) atom to form AlO6 octahedra that share  a cornercorner with one Al(1)O4 tetrahedra,  a cornercorner with one Al(2)O4 tetrahedra,  a cornercorner with one Al(6)O4 tetrahedra,  a cornercorner with one Al(7)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, edges with two equivalent Al(4)O6 octahedra, and  an edgeedge with one Al(5)O5 trigonal bipyramid. In the fifth Al site, Al(5) is bonded to one O(14), one O(3), one O(8), and two equivalent O(11) atoms to form distorted AlO5 trigonal bipyramids that share corners with two equivalent Al(3)O6 octahedra,  a cornercorner with one Al(1)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, edges with two equivalent Al(4)O6 octahedra, and  an edgeedge with one Al(7)O4 tetrahedra. The corner-sharing octahedral tilt angles are 51°. In the sixth Al site, Al(6) is bonded to one O(15), one O(4), and two equivalent O(12) atoms to form AlO4 tetrahedra that share corners with two equivalent Al(3)O6 octahedra, corners with two equivalent Al(4)O6 octahedra,  a cornercorner with one Si(2)O4 tetrahedra, and corners with two equivalent Al(7)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 53-57°. In the seventh Al site, Al(7) is bonded to one O(14), one O(8), and two equivalent O(12) atoms to form AlO4 tetrahedra that share corners with two equivalent Al(3)O6 octahedra, corners with two equivalent Al(4)O6 octahedra,  a cornercorner with one Al(1)O4 tetrahedra, corners with two equivalent Al(6)O4 tetrahedra, and  an edgeedge with one Al(5)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 51-57°. B(1) is bonded in a trigonal planar geometry to one O(6) and two equivalent O(10) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(13), one O(7), and two equivalent O(11) atoms to form SiO4 tetrahedra that share corners with two equivalent Al(3)O6 octahedra, corners with two equivalent Al(4)O6 octahedra,  a cornercorner with one Al(2)O4 tetrahedra, and corners with two equivalent Al(5)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 51-54°. In the second Si site, Si(2) is bonded to one O(15), one O(5), and two equivalent O(9) atoms to form SiO4 tetrahedra that share corners with two equivalent Al(3)O6 octahedra, corners with two equivalent Al(4)O6 octahedra,  a cornercorner with one Al(6)O4 tetrahedra, and corners with two equivalent Al(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 50-55°. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Al(2) and two equivalent Al(3) atoms. In the second O site, O(2) is bonded in a trigonal planar geometry to one Al(1) and two equivalent Al(4) atoms. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Al(5) and two equivalent Al(3) atoms. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Al(6) and two equivalent Al(4) atoms. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to two equivalent Al(4) and one Si(2) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to two equivalent Al(3) and one B(1) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to two equivalent Al(3) and one Si(1) atom. In the eighth O site, O(8) is bonded in a trigonal pyramidal geometry to one Al(5), one Al(7), and two equivalent Al(4) atoms. In the ninth O site, O(9) is bonded in a trigonal planar geometry to one Al(1), one Al(3), and one Si(2) atom. In the tenth O site, O(10) is bonded in a trigonal planar geometry to one Al(2), one Al(4), and one B(1) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal planar geometry to one Al(4), one Al(5), and one Si(1) atom. In the twelfth O site, O(12) is bonded in a trigonal planar geometry to one Al(3), one Al(6), and one Al(7) atom. In the thirteenth O site, O(13) is bonded in a linear geometry to one Al(2) and one Si(1) atom. In the fourteenth O site, O(14) is bonded in a distorted trigonal non-coplanar geometry to one Al(1), one Al(5), and one Al(7) atom. In the fifteenth O site, O(15) is bonded in a linear geometry to one Al(6) and one Si(2) atom. is represented by the CIF file [CIF]
data_Al9Si2BO19
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.120
_cell_length_b   8.120
_cell_length_c   7.676
_cell_angle_alpha   87.790
_cell_angle_beta   87.790
_cell_angle_gamma   41.800
_symmetry_Int_Tables_number   1
_cell_volume   337.063
_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
  Al  Al0  1  0.551  0.551  0.833  1.0
  Al  Al1  1  0.438  0.438  0.314  1.0
  Al  Al2  1  0.379  0.865  0.164  1.0
  Al  Al3  1  0.865  0.379  0.164  1.0
  Al  Al4  1  0.629  0.136  0.650  1.0
  Al  Al5  1  0.136  0.629  0.650  1.0
  Al  Al6  1  0.747  0.747  0.853  1.0
  Al  Al7  1  0.204  0.204  0.493  1.0
  Al  Al8  1  0.703  0.703  0.497  1.0
  Si  Si9  1  0.296  0.296  0.996  1.0
  Si  Si10  1  0.049  0.049  0.819  1.0
  B  B11  1  0.977  0.977  0.363  1.0
  O  O12  1  0.549  0.549  0.237  1.0
  O  O13  1  0.456  0.456  0.710  1.0
  O  O14  1  0.686  0.686  0.056  1.0
  O  O15  1  0.319  0.319  0.546  1.0
  O  O16  1  0.951  0.951  0.736  1.0
  O  O17  1  0.050  0.050  0.252  1.0
  O  O18  1  0.192  0.192  0.073  1.0
  O  O19  1  0.806  0.806  0.608  1.0
  O  O20  1  0.284  0.822  0.945  1.0
  O  O21  1  0.822  0.284  0.945  1.0
  O  O22  1  0.729  0.149  0.421  1.0
  O  O23  1  0.149  0.729  0.421  1.0
  O  O24  1  0.539  0.079  0.867  1.0
  O  O25  1  0.079  0.539  0.867  1.0
  O  O26  1  0.441  0.933  0.372  1.0
  O  O27  1  0.933  0.441  0.372  1.0
  O  O28  1  0.365  0.365  0.147  1.0
  O  O29  1  0.651  0.651  0.709  1.0
  O  O30  1  0.125  0.125  0.667  1.0
[/CIF]
.