data_[Ba10Si8O28]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Ba  0.8900  2.1500  1.4900
  Si  1.9000  1.1000  0.5400
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [P4/mnc]
_cell_length_a [7.8258]
_cell_length_b [7.8258]
_cell_length_c [11.9207]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [128]
_chemical_formula_structural [Ba5(Si2O7)2]
_chemical_formula_sum '[Ba10 Si8 O28]'
_cell_volume [730.0519]
_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
[
  Ba  Ba0  8  0.1604  0.6604  0.2500  1
  Ba  Ba1  2  0.0000  0.0000  0.0000  1
  Si  Si2  8  0.1152  0.2739  0.5000  1
  O  O3  16  0.1257  0.3306  0.1135  1
  O  O4  8  0.0904  0.7745  0.5000  1
  O  O5  4  0.0000  0.0000  0.2481  1
]