data_[Sr4Si2O8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Sr  0.9500  2.0000  1.3200
  Si  1.9000  1.1000  0.5400
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [P2_1/m]
_cell_length_a [5.6150]
_cell_length_b [5.7957]
_cell_length_c [6.9846]
_cell_angle_alpha [90.0000]
_cell_angle_beta [108.7535]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [11]
_chemical_formula_structural [Sr2SiO4]
_chemical_formula_sum '[Sr4 Si2 O8]'
_cell_volume [215.2312]
_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
[
  Sr  Sr0  2  0.2065  0.2500  0.4297  1.0
  Sr  Sr1  2  0.3120  0.2500  0.9725  1.0
  Si  Si2  2  0.2575  0.7500  0.2052  1.0
  O  O3  4  0.4489  0.5248  0.2611  1.0
  O  O4  2  0.0609  0.7500  0.3380  1.0
  O  O5  2  0.1082  0.7500  0.9584  1.0
]