data_[Sr4Al8Si4O24]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Sr  0.9500  2.0000  1.3200
  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/c]
_cell_length_a [10.9460]
_cell_length_b [9.3564]
_cell_length_c [6.2447]
_cell_angle_alpha [90.0000]
_cell_angle_beta [120.9598]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [15]
_chemical_formula_structural [SrAl2SiO6]
_chemical_formula_sum '[Sr4 Al8 Si4 O24]'
_cell_volume [548.4319]
_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
[
  Sr  Sr0  4  0.0000  0.1994  0.2500  1.0
  Al  Al1  8  0.2089  0.4369  0.1556  1.0
  Si  Si2  4  0.0000  0.1952  0.7500  1.0
  O  O3  8  0.0997  0.2867  0.0018  1.0
  O  O4  8  0.1031  0.0983  0.6893  1.0
  O  O5  8  0.1821  0.4424  0.4161  1.0
]