data_[Al2Si8O20]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Al  1.6100  1.2500  0.6750
  Si  1.9000  1.1000  0.5400
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [C2]
_cell_length_a [14.0025]
_cell_length_b [6.1850]
_cell_length_c [5.0455]
_cell_angle_alpha [90.0000]
_cell_angle_beta [91.8897]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [5]
_chemical_formula_structural [Al(Si2O5)2]
_chemical_formula_sum '[Al2 Si8 O20]'
_cell_volume [436.7322]
_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  2  0.0000  0.5081  0.0000  1.0
  Si  Si1  4  0.1410  0.1563  0.7594  1.0
  Si  Si2  4  0.1529  0.8603  0.2728  1.0
  O  O3  4  0.0561  0.3310  0.7803  1.0
  O  O4  4  0.0839  0.6705  0.1677  1.0
  O  O5  4  0.1143  0.9650  0.5468  1.0
  O  O6  4  0.1615  0.0524  0.0529  1.0
  O  O7  4  0.2386  0.2727  0.6624  1.0
]