The material structure described by BeAlSiO5 crystallizes in the monoclinic P2_1/c space group. Be(1) is bonded to one O(2), one O(5), and two equivalent O(3) atoms to form BeO4 tetrahedra that share corners with two equivalent Al(1)O6 octahedra, corners with two equivalent Be(1)O4 tetrahedra, and corners with three equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 47-59°. Al(1) is bonded to one O(2), one O(5), two equivalent O(1), and two equivalent O(4) atoms to form AlO6 octahedra that share corners with two equivalent Be(1)O4 tetrahedra, corners with five equivalent Si(1)O4 tetrahedra, and edges with two equivalent Al(1)O6 octahedra. Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SiO4 tetrahedra that share corners with five equivalent Al(1)O6 octahedra and corners with three equivalent Be(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 47-57°. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to two equivalent Al(1) and one Si(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Be(1), one Al(1), and one Si(1) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to two equivalent Be(1) and one Si(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to two equivalent Al(1) and one Si(1) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Be(1) and one Al(1) atom. is represented by the CIF file [CIF]
data_BeAlSiO5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   14.557
_cell_length_b   4.619
_cell_length_c   4.830
_cell_angle_alpha   80.861
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   320.654
_cell_formula_units_Z   4
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
  Be  Be0  1  0.200  0.545  0.679  1.0
  Be  Be1  1  0.700  0.455  0.821  1.0
  Be  Be2  1  0.800  0.455  0.321  1.0
  Be  Be3  1  0.300  0.545  0.179  1.0
  Al  Al4  1  0.055  0.042  0.749  1.0
  Al  Al5  1  0.555  0.958  0.751  1.0
  Al  Al6  1  0.945  0.958  0.251  1.0
  Al  Al7  1  0.445  0.042  0.249  1.0
  Si  Si8  1  0.398  0.462  0.680  1.0
  Si  Si9  1  0.898  0.538  0.820  1.0
  Si  Si10  1  0.602  0.538  0.320  1.0
  Si  Si11  1  0.102  0.462  0.180  1.0
  O  O12  1  0.465  0.234  0.885  1.0
  O  O13  1  0.965  0.766  0.615  1.0
  O  O14  1  0.535  0.766  0.115  1.0
  O  O15  1  0.035  0.234  0.385  1.0
  O  O16  1  0.127  0.336  0.886  1.0
  O  O17  1  0.627  0.664  0.614  1.0
  O  O18  1  0.873  0.664  0.114  1.0
  O  O19  1  0.373  0.336  0.386  1.0
  O  O20  1  0.300  0.502  0.845  1.0
  O  O21  1  0.800  0.498  0.655  1.0
  O  O22  1  0.700  0.498  0.155  1.0
  O  O23  1  0.200  0.502  0.345  1.0
  O  O24  1  0.450  0.782  0.598  1.0
  O  O25  1  0.950  0.218  0.902  1.0
  O  O26  1  0.550  0.218  0.402  1.0
  O  O27  1  0.050  0.782  0.098  1.0
  O  O28  1  0.165  0.878  0.653  1.0
  O  O29  1  0.665  0.122  0.847  1.0
  O  O30  1  0.835  0.122  0.347  1.0
  O  O31  1  0.335  0.878  0.153  1.0
[/CIF]
.
The material structure described by BeAlSiO5 crystallizes in the monoclinic P2_1/c space group. Be(1) is bonded to one O(2), one O(5), and two equivalent O(3) atoms to form BeO4 tetrahedra that share corners with two equivalent Al(1)O6 octahedra, corners with two equivalent Be(1)O4 tetrahedra, and corners with three equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 47-59°. Al(1) is bonded to one O(2), one O(5), two equivalent O(1), and two equivalent O(4) atoms to form AlO6 octahedra that share corners with two equivalent Be(1)O4 tetrahedra, corners with five equivalent Si(1)O4 tetrahedra, and edges with two equivalent Al(1)O6 octahedra. Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SiO4 tetrahedra that share corners with five equivalent Al(1)O6 octahedra and corners with three equivalent Be(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 47-57°. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to two equivalent Al(1) and one Si(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Be(1), one Al(1), and one Si(1) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to two equivalent Be(1) and one Si(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to two equivalent Al(1) and one Si(1) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Be(1) and one Al(1) atom. is represented by the CIF file [CIF]
data_BeAlSiO5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   14.557
_cell_length_b   4.619
_cell_length_c   4.830
_cell_angle_alpha   80.861
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   320.654
_cell_formula_units_Z   4
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
  Be  Be0  1  0.200  0.545  0.679  1.0
  Be  Be1  1  0.700  0.455  0.821  1.0
  Be  Be2  1  0.800  0.455  0.321  1.0
  Be  Be3  1  0.300  0.545  0.179  1.0
  Al  Al4  1  0.055  0.042  0.749  1.0
  Al  Al5  1  0.555  0.958  0.751  1.0
  Al  Al6  1  0.945  0.958  0.251  1.0
  Al  Al7  1  0.445  0.042  0.249  1.0
  Si  Si8  1  0.398  0.462  0.680  1.0
  Si  Si9  1  0.898  0.538  0.820  1.0
  Si  Si10  1  0.602  0.538  0.320  1.0
  Si  Si11  1  0.102  0.462  0.180  1.0
  O  O12  1  0.465  0.234  0.885  1.0
  O  O13  1  0.965  0.766  0.615  1.0
  O  O14  1  0.535  0.766  0.115  1.0
  O  O15  1  0.035  0.234  0.385  1.0
  O  O16  1  0.127  0.336  0.886  1.0
  O  O17  1  0.627  0.664  0.614  1.0
  O  O18  1  0.873  0.664  0.114  1.0
  O  O19  1  0.373  0.336  0.386  1.0
  O  O20  1  0.300  0.502  0.845  1.0
  O  O21  1  0.800  0.498  0.655  1.0
  O  O22  1  0.700  0.498  0.155  1.0
  O  O23  1  0.200  0.502  0.345  1.0
  O  O24  1  0.450  0.782  0.598  1.0
  O  O25  1  0.950  0.218  0.902  1.0
  O  O26  1  0.550  0.218  0.402  1.0
  O  O27  1  0.050  0.782  0.098  1.0
  O  O28  1  0.165  0.878  0.653  1.0
  O  O29  1  0.665  0.122  0.847  1.0
  O  O30  1  0.835  0.122  0.347  1.0
  O  O31  1  0.335  0.878  0.153  1.0
[/CIF]
.