The material structure described by Al5BO9 crystallizes in the orthorhombic Cmc2_1 space group. There are four inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(7) atom to form AlO6 octahedra that share corners with two equivalent Al(2)O4 tetrahedra,  a cornercorner with one Al(4)O5 trigonal bipyramid, edges with two equivalent Al(1)O6 octahedra, and  an edgeedge with one Al(4)O5 trigonal bipyramid. In the second Al site, Al(2) is bonded to one O(1), one O(6), and two equivalent O(7) atoms to form AlO4 tetrahedra that share corners with four equivalent Al(1)O6 octahedra, corners with two equivalent Al(4)O5 trigonal bipyramids, and  an edgeedge with one Al(4)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 49-56°. In the third Al site, Al(3) is bonded in a 5-coordinate geometry to one O(3), one O(4), one O(6), and two equivalent O(5) atoms. In the fourth Al site, Al(4) is bonded to one O(1), one O(4), one O(6), and two equivalent O(7) atoms to form distorted AlO5 trigonal bipyramids that share corners with two equivalent Al(1)O6 octahedra, corners with two equivalent Al(2)O4 tetrahedra, edges with two equivalent Al(1)O6 octahedra, and  an edgeedge with one Al(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 47°. B(1) is bonded in a trigonal planar geometry to one O(2) and two equivalent O(5) atoms. There are seven inequivalent O sites. In the first O site, O(6) is bonded in a T-shaped geometry to one Al(2), one Al(3), and one Al(4) atom. In the second O site, O(7) is bonded in a trigonal planar geometry to one Al(1), one Al(2), and one Al(4) atom. In the third O site, O(1) is bonded to one Al(2), one Al(4), and two equivalent Al(1) atoms to form corner-sharing OAl4 trigonal pyramids. In the fourth O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent Al(1) and one B(1) atom. In the fifth O site, O(3) is bonded in a trigonal planar geometry to one Al(3) and two equivalent Al(1) atoms. In the sixth O site, O(4) is bonded to one Al(3), one Al(4), and two equivalent Al(1) atoms to form corner-sharing OAl4 trigonal pyramids. In the seventh O site, O(5) is bonded in a trigonal planar geometry to one Al(1), one Al(3), and one B(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Al5BO9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.008
_cell_length_b   8.008
_cell_length_c   7.689
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   138.480
_symmetry_Int_Tables_number   1
_cell_volume   326.837
_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
  Al  Al0  1  0.368  0.136  0.500  1.0
  Al  Al1  1  0.297  0.703  0.333  1.0
  Al  Al2  1  0.703  0.297  0.833  1.0
  Al  Al3  1  0.556  0.444  0.184  1.0
  Al  Al4  1  0.444  0.556  0.684  1.0
  Al  Al5  1  0.745  0.255  0.184  1.0
  Al  Al6  1  0.255  0.745  0.684  1.0
  Al  Al7  1  0.136  0.368  1.000  1.0
  Al  Al8  1  0.864  0.632  0.500  1.0
  Al  Al9  1  0.632  0.864  1.000  1.0
  B  B10  1  0.985  0.015  0.722  1.0
  B  B11  1  0.015  0.985  0.222  1.0
  O  O12  1  0.191  0.809  0.435  1.0
  O  O13  1  0.954  0.046  0.093  1.0
  O  O14  1  0.046  0.954  0.593  1.0
  O  O15  1  0.454  0.546  0.073  1.0
  O  O16  1  0.546  0.454  0.573  1.0
  O  O17  1  0.669  0.331  0.368  1.0
  O  O18  1  0.331  0.669  0.868  1.0
  O  O19  1  0.837  0.742  0.286  1.0
  O  O20  1  0.809  0.191  0.935  1.0
  O  O21  1  0.648  0.352  0.037  1.0
  O  O22  1  0.742  0.837  0.786  1.0
  O  O23  1  0.258  0.163  0.286  1.0
  O  O24  1  0.163  0.258  0.786  1.0
  O  O25  1  0.447  0.067  0.700  1.0
  O  O26  1  0.067  0.447  0.200  1.0
  O  O27  1  0.553  0.933  0.200  1.0
  O  O28  1  0.933  0.553  0.700  1.0
  O  O29  1  0.352  0.648  0.537  1.0
[/CIF]
.
The material structure described by Al5BO9 crystallizes in the orthorhombic Cmc2_1 space group. There are four inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(7) atom to form AlO6 octahedra that share corners with two equivalent Al(2)O4 tetrahedra,  a cornercorner with one Al(4)O5 trigonal bipyramid, edges with two equivalent Al(1)O6 octahedra, and  an edgeedge with one Al(4)O5 trigonal bipyramid. In the second Al site, Al(2) is bonded to one O(1), one O(6), and two equivalent O(7) atoms to form AlO4 tetrahedra that share corners with four equivalent Al(1)O6 octahedra, corners with two equivalent Al(4)O5 trigonal bipyramids, and  an edgeedge with one Al(4)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 49-56°. In the third Al site, Al(3) is bonded in a 5-coordinate geometry to one O(3), one O(4), one O(6), and two equivalent O(5) atoms. In the fourth Al site, Al(4) is bonded to one O(1), one O(4), one O(6), and two equivalent O(7) atoms to form distorted AlO5 trigonal bipyramids that share corners with two equivalent Al(1)O6 octahedra, corners with two equivalent Al(2)O4 tetrahedra, edges with two equivalent Al(1)O6 octahedra, and  an edgeedge with one Al(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 47°. B(1) is bonded in a trigonal planar geometry to one O(2) and two equivalent O(5) atoms. There are seven inequivalent O sites. In the first O site, O(6) is bonded in a T-shaped geometry to one Al(2), one Al(3), and one Al(4) atom. In the second O site, O(7) is bonded in a trigonal planar geometry to one Al(1), one Al(2), and one Al(4) atom. In the third O site, O(1) is bonded to one Al(2), one Al(4), and two equivalent Al(1) atoms to form corner-sharing OAl4 trigonal pyramids. In the fourth O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent Al(1) and one B(1) atom. In the fifth O site, O(3) is bonded in a trigonal planar geometry to one Al(3) and two equivalent Al(1) atoms. In the sixth O site, O(4) is bonded to one Al(3), one Al(4), and two equivalent Al(1) atoms to form corner-sharing OAl4 trigonal pyramids. In the seventh O site, O(5) is bonded in a trigonal planar geometry to one Al(1), one Al(3), and one B(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Al5BO9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.008
_cell_length_b   8.008
_cell_length_c   7.689
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   138.480
_symmetry_Int_Tables_number   1
_cell_volume   326.837
_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
  Al  Al0  1  0.368  0.136  0.500  1.0
  Al  Al1  1  0.297  0.703  0.333  1.0
  Al  Al2  1  0.703  0.297  0.833  1.0
  Al  Al3  1  0.556  0.444  0.184  1.0
  Al  Al4  1  0.444  0.556  0.684  1.0
  Al  Al5  1  0.745  0.255  0.184  1.0
  Al  Al6  1  0.255  0.745  0.684  1.0
  Al  Al7  1  0.136  0.368  1.000  1.0
  Al  Al8  1  0.864  0.632  0.500  1.0
  Al  Al9  1  0.632  0.864  1.000  1.0
  B  B10  1  0.985  0.015  0.722  1.0
  B  B11  1  0.015  0.985  0.222  1.0
  O  O12  1  0.191  0.809  0.435  1.0
  O  O13  1  0.954  0.046  0.093  1.0
  O  O14  1  0.046  0.954  0.593  1.0
  O  O15  1  0.454  0.546  0.073  1.0
  O  O16  1  0.546  0.454  0.573  1.0
  O  O17  1  0.669  0.331  0.368  1.0
  O  O18  1  0.331  0.669  0.868  1.0
  O  O19  1  0.837  0.742  0.286  1.0
  O  O20  1  0.809  0.191  0.935  1.0
  O  O21  1  0.648  0.352  0.037  1.0
  O  O22  1  0.742  0.837  0.786  1.0
  O  O23  1  0.258  0.163  0.286  1.0
  O  O24  1  0.163  0.258  0.786  1.0
  O  O25  1  0.447  0.067  0.700  1.0
  O  O26  1  0.067  0.447  0.200  1.0
  O  O27  1  0.553  0.933  0.200  1.0
  O  O28  1  0.933  0.553  0.700  1.0
  O  O29  1  0.352  0.648  0.537  1.0
[/CIF]
.