The compound described by Al8SiO14 crystallizes in the orthorhombic Pmc2_1 space group. There are eight inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(10), one O(3), two equivalent O(13), and two equivalent O(8) atoms to form AlO6 octahedra that share corners with two equivalent Al(3)O4 tetrahedra, corners with two equivalent Al(6)O4 tetrahedra, corners with two equivalent Al(7)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, and edges with two equivalent Al(1)O6 octahedra. In the second Al site, Al(2) is bonded to one O(4), one O(9), two equivalent O(14), and two equivalent O(7) atoms to form AlO6 octahedra that share corners with two equivalent Al(4)O4 tetrahedra, corners with two equivalent Al(6)O4 tetrahedra, corners with two equivalent Al(7)O4 tetrahedra, corners with two equivalent Al(8)O4 tetrahedra, and edges with two equivalent Al(2)O6 octahedra. In the third Al site, Al(3) is bonded to one O(1), one O(13), and two equivalent O(5) atoms to form AlO4 tetrahedra that share corners with two equivalent Al(1)O6 octahedra, corners with two equivalent Al(5)O6 octahedra,  a cornercorner with one Al(6)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra, and corners with two equivalent Al(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 60-62°. In the fourth Al site, Al(4) is bonded to one O(14), one O(2), and two equivalent O(6) atoms to form AlO4 tetrahedra that share corners with two equivalent Al(2)O6 octahedra, corners with two equivalent Al(5)O6 octahedra,  a cornercorner with one Al(7)O4 tetrahedra,  a cornercorner with one Al(8)O4 tetrahedra, and corners with two equivalent Al(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 56-66°. In the fifth Al site, Al(5) is bonded to one O(5), one O(6), two equivalent O(11), and two equivalent O(12) atoms to form AlO6 octahedra that share corners with two equivalent Al(3)O4 tetrahedra, corners with two equivalent Al(4)O4 tetrahedra, corners with two equivalent Al(8)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, and edges with two equivalent Al(5)O6 octahedra. In the sixth Al site, Al(6) is bonded to one O(1), one O(7), and two equivalent O(3) atoms to form AlO4 tetrahedra that share corners with two equivalent Al(1)O6 octahedra, corners with two equivalent Al(2)O6 octahedra,  a cornercorner with one Al(3)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra, and corners with two equivalent Al(6)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 50-59°. In the seventh Al site, Al(7) is bonded to one O(2), one O(8), and two equivalent O(4) atoms to form AlO4 tetrahedra that share corners with two equivalent Al(1)O6 octahedra, corners with two equivalent Al(2)O6 octahedra,  a cornercorner with one Al(4)O4 tetrahedra,  a cornercorner with one Al(8)O4 tetrahedra, and corners with two equivalent Al(7)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 52-63°. In the eighth Al site, Al(8) is bonded to one O(11), one O(2), and two equivalent O(9) atoms to form AlO4 tetrahedra that share corners with two equivalent Al(2)O6 octahedra, corners with two equivalent Al(5)O6 octahedra,  a cornercorner with one Al(4)O4 tetrahedra,  a cornercorner with one Al(7)O4 tetrahedra, and corners with two equivalent Al(8)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 55-58°. Si(1) is bonded to one O(1), one O(12), and two equivalent O(10) atoms to form SiO4 tetrahedra that share corners with two equivalent Al(1)O6 octahedra, corners with two equivalent Al(5)O6 octahedra,  a cornercorner with one Al(3)O4 tetrahedra,  a cornercorner with one Al(6)O4 tetrahedra, and corners with two equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 51-60°. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Al(3), one Al(6), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to one Al(4), one Al(7), and one Al(8) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one Al(1) and two equivalent Al(6) atoms. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Al(2) and two equivalent Al(7) atoms. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Al(5) and two equivalent Al(3) atoms. In the sixth O site, O(6) is bonded in a trigonal non-coplanar geometry to one Al(5) and two equivalent Al(4) atoms. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one Al(6) and two equivalent Al(2) atoms. In the eighth O site, O(8) is bonded in a trigonal planar geometry to one Al(7) and two equivalent Al(1) atoms. In the ninth O site, O(9) is bonded in a trigonal planar geometry to one Al(2) and two equivalent Al(8) atoms. In the tenth O site, O(10) is bonded in a trigonal planar geometry to one Al(1) and two equivalent Si(1) atoms. In the eleventh O site, O(11) is bonded in a trigonal planar geometry to one Al(8) and two equivalent Al(5) atoms. In the twelfth O site, O(12) is bonded in a distorted trigonal planar geometry to two equivalent Al(5) and one Si(1) atom. In the thirteenth O site, O(13) is bonded in a trigonal planar geometry to one Al(3) and two equivalent Al(1) atoms. In the fourteenth O site, O(14) is bonded in a trigonal planar geometry to one Al(4) and two equivalent Al(2) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Al8SiO14
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   2.966
_cell_length_b   7.796
_cell_length_c   23.308
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   538.982
_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  0.000  0.255  0.326  1.0
  Al  Al1  1  0.000  0.254  0.669  1.0
  Al  Al2  1  0.000  0.745  0.826  1.0
  Al  Al3  1  0.000  0.746  0.169  1.0
  Al  Al4  1  0.500  0.483  0.911  1.0
  Al  Al5  1  0.500  0.033  0.090  1.0
  Al  Al6  1  0.500  0.517  0.411  1.0
  Al  Al7  1  0.500  0.967  0.590  1.0
  Al  Al8  1  0.000  0.252  0.003  1.0
  Al  Al9  1  0.000  0.748  0.503  1.0
  Al  Al10  1  0.500  0.585  0.282  1.0
  Al  Al11  1  0.500  0.926  0.715  1.0
  Al  Al12  1  0.500  0.415  0.782  1.0
  Al  Al13  1  0.500  0.074  0.215  1.0
  Al  Al14  1  0.500  0.590  0.616  1.0
  Al  Al15  1  0.500  0.410  0.116  1.0
  Si  Si16  1  0.500  0.891  0.386  1.0
  Si  Si17  1  0.500  0.109  0.886  1.0
  O  O18  1  0.500  0.702  0.353  1.0
  O  O19  1  0.500  0.803  0.649  1.0
  O  O20  1  0.500  0.298  0.853  1.0
  O  O21  1  0.500  0.197  0.149  1.0
  O  O22  1  0.000  0.471  0.293  1.0
  O  O23  1  0.000  0.044  0.714  1.0
  O  O24  1  0.000  0.529  0.793  1.0
  O  O25  1  0.000  0.956  0.214  1.0
  O  O26  1  0.000  0.437  0.947  1.0
  O  O27  1  0.000  0.058  0.050  1.0
  O  O28  1  0.000  0.563  0.447  1.0
  O  O29  1  0.000  0.942  0.550  1.0
  O  O30  1  0.500  0.329  0.715  1.0
  O  O31  1  0.500  0.176  0.283  1.0
  O  O32  1  0.500  0.671  0.215  1.0
  O  O33  1  0.500  0.824  0.783  1.0
  O  O34  1  0.000  0.476  0.630  1.0
  O  O35  1  0.000  0.989  0.369  1.0
  O  O36  1  0.000  0.524  0.130  1.0
  O  O37  1  0.000  0.011  0.869  1.0
  O  O38  1  0.500  0.341  0.042  1.0
  O  O39  1  0.500  0.148  0.954  1.0
  O  O40  1  0.500  0.659  0.542  1.0
  O  O41  1  0.500  0.852  0.454  1.0
  O  O42  1  0.500  0.319  0.376  1.0
  O  O43  1  0.500  0.165  0.625  1.0
  O  O44  1  0.500  0.681  0.876  1.0
  O  O45  1  0.500  0.835  0.125  1.0
[/CIF]
.
The compound described by Al8SiO14 crystallizes in the orthorhombic Pmc2_1 space group. There are eight inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(10), one O(3), two equivalent O(13), and two equivalent O(8) atoms to form AlO6 octahedra that share corners with two equivalent Al(3)O4 tetrahedra, corners with two equivalent Al(6)O4 tetrahedra, corners with two equivalent Al(7)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, and edges with two equivalent Al(1)O6 octahedra. In the second Al site, Al(2) is bonded to one O(4), one O(9), two equivalent O(14), and two equivalent O(7) atoms to form AlO6 octahedra that share corners with two equivalent Al(4)O4 tetrahedra, corners with two equivalent Al(6)O4 tetrahedra, corners with two equivalent Al(7)O4 tetrahedra, corners with two equivalent Al(8)O4 tetrahedra, and edges with two equivalent Al(2)O6 octahedra. In the third Al site, Al(3) is bonded to one O(1), one O(13), and two equivalent O(5) atoms to form AlO4 tetrahedra that share corners with two equivalent Al(1)O6 octahedra, corners with two equivalent Al(5)O6 octahedra,  a cornercorner with one Al(6)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra, and corners with two equivalent Al(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 60-62°. In the fourth Al site, Al(4) is bonded to one O(14), one O(2), and two equivalent O(6) atoms to form AlO4 tetrahedra that share corners with two equivalent Al(2)O6 octahedra, corners with two equivalent Al(5)O6 octahedra,  a cornercorner with one Al(7)O4 tetrahedra,  a cornercorner with one Al(8)O4 tetrahedra, and corners with two equivalent Al(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 56-66°. In the fifth Al site, Al(5) is bonded to one O(5), one O(6), two equivalent O(11), and two equivalent O(12) atoms to form AlO6 octahedra that share corners with two equivalent Al(3)O4 tetrahedra, corners with two equivalent Al(4)O4 tetrahedra, corners with two equivalent Al(8)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, and edges with two equivalent Al(5)O6 octahedra. In the sixth Al site, Al(6) is bonded to one O(1), one O(7), and two equivalent O(3) atoms to form AlO4 tetrahedra that share corners with two equivalent Al(1)O6 octahedra, corners with two equivalent Al(2)O6 octahedra,  a cornercorner with one Al(3)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra, and corners with two equivalent Al(6)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 50-59°. In the seventh Al site, Al(7) is bonded to one O(2), one O(8), and two equivalent O(4) atoms to form AlO4 tetrahedra that share corners with two equivalent Al(1)O6 octahedra, corners with two equivalent Al(2)O6 octahedra,  a cornercorner with one Al(4)O4 tetrahedra,  a cornercorner with one Al(8)O4 tetrahedra, and corners with two equivalent Al(7)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 52-63°. In the eighth Al site, Al(8) is bonded to one O(11), one O(2), and two equivalent O(9) atoms to form AlO4 tetrahedra that share corners with two equivalent Al(2)O6 octahedra, corners with two equivalent Al(5)O6 octahedra,  a cornercorner with one Al(4)O4 tetrahedra,  a cornercorner with one Al(7)O4 tetrahedra, and corners with two equivalent Al(8)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 55-58°. Si(1) is bonded to one O(1), one O(12), and two equivalent O(10) atoms to form SiO4 tetrahedra that share corners with two equivalent Al(1)O6 octahedra, corners with two equivalent Al(5)O6 octahedra,  a cornercorner with one Al(3)O4 tetrahedra,  a cornercorner with one Al(6)O4 tetrahedra, and corners with two equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 51-60°. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Al(3), one Al(6), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to one Al(4), one Al(7), and one Al(8) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one Al(1) and two equivalent Al(6) atoms. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Al(2) and two equivalent Al(7) atoms. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Al(5) and two equivalent Al(3) atoms. In the sixth O site, O(6) is bonded in a trigonal non-coplanar geometry to one Al(5) and two equivalent Al(4) atoms. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one Al(6) and two equivalent Al(2) atoms. In the eighth O site, O(8) is bonded in a trigonal planar geometry to one Al(7) and two equivalent Al(1) atoms. In the ninth O site, O(9) is bonded in a trigonal planar geometry to one Al(2) and two equivalent Al(8) atoms. In the tenth O site, O(10) is bonded in a trigonal planar geometry to one Al(1) and two equivalent Si(1) atoms. In the eleventh O site, O(11) is bonded in a trigonal planar geometry to one Al(8) and two equivalent Al(5) atoms. In the twelfth O site, O(12) is bonded in a distorted trigonal planar geometry to two equivalent Al(5) and one Si(1) atom. In the thirteenth O site, O(13) is bonded in a trigonal planar geometry to one Al(3) and two equivalent Al(1) atoms. In the fourteenth O site, O(14) is bonded in a trigonal planar geometry to one Al(4) and two equivalent Al(2) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Al8SiO14
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   2.966
_cell_length_b   7.796
_cell_length_c   23.308
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   538.982
_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  0.000  0.255  0.326  1.0
  Al  Al1  1  0.000  0.254  0.669  1.0
  Al  Al2  1  0.000  0.745  0.826  1.0
  Al  Al3  1  0.000  0.746  0.169  1.0
  Al  Al4  1  0.500  0.483  0.911  1.0
  Al  Al5  1  0.500  0.033  0.090  1.0
  Al  Al6  1  0.500  0.517  0.411  1.0
  Al  Al7  1  0.500  0.967  0.590  1.0
  Al  Al8  1  0.000  0.252  0.003  1.0
  Al  Al9  1  0.000  0.748  0.503  1.0
  Al  Al10  1  0.500  0.585  0.282  1.0
  Al  Al11  1  0.500  0.926  0.715  1.0
  Al  Al12  1  0.500  0.415  0.782  1.0
  Al  Al13  1  0.500  0.074  0.215  1.0
  Al  Al14  1  0.500  0.590  0.616  1.0
  Al  Al15  1  0.500  0.410  0.116  1.0
  Si  Si16  1  0.500  0.891  0.386  1.0
  Si  Si17  1  0.500  0.109  0.886  1.0
  O  O18  1  0.500  0.702  0.353  1.0
  O  O19  1  0.500  0.803  0.649  1.0
  O  O20  1  0.500  0.298  0.853  1.0
  O  O21  1  0.500  0.197  0.149  1.0
  O  O22  1  0.000  0.471  0.293  1.0
  O  O23  1  0.000  0.044  0.714  1.0
  O  O24  1  0.000  0.529  0.793  1.0
  O  O25  1  0.000  0.956  0.214  1.0
  O  O26  1  0.000  0.437  0.947  1.0
  O  O27  1  0.000  0.058  0.050  1.0
  O  O28  1  0.000  0.563  0.447  1.0
  O  O29  1  0.000  0.942  0.550  1.0
  O  O30  1  0.500  0.329  0.715  1.0
  O  O31  1  0.500  0.176  0.283  1.0
  O  O32  1  0.500  0.671  0.215  1.0
  O  O33  1  0.500  0.824  0.783  1.0
  O  O34  1  0.000  0.476  0.630  1.0
  O  O35  1  0.000  0.989  0.369  1.0
  O  O36  1  0.000  0.524  0.130  1.0
  O  O37  1  0.000  0.011  0.869  1.0
  O  O38  1  0.500  0.341  0.042  1.0
  O  O39  1  0.500  0.148  0.954  1.0
  O  O40  1  0.500  0.659  0.542  1.0
  O  O41  1  0.500  0.852  0.454  1.0
  O  O42  1  0.500  0.319  0.376  1.0
  O  O43  1  0.500  0.165  0.625  1.0
  O  O44  1  0.500  0.681  0.876  1.0
  O  O45  1  0.500  0.835  0.125  1.0
[/CIF]
.