data_[Na4Be8Se4O24]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Be  1.5700  1.0500  0.5900
  Se  2.5500  1.1500  1.0133
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [C2/c]
_cell_length_a [9.5871]
_cell_length_b [10.2004]
_cell_length_c [5.7128]
_cell_angle_alpha [90.0000]
_cell_angle_beta [119.7870]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [15]
_chemical_formula_structural [NaBe2SeO6]
_chemical_formula_sum '[Na4 Be8 Se4 O24]'
_cell_volume [484.8562]
_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
[
  Na  Na0  4  0.0000  0.1200  0.2500  1
  Be  Be1  8  0.1530  0.4389  0.0725  1
  Se  Se2  4  0.0000  0.1928  0.7500  1
  O  O3  8  0.0885  0.2767  0.0403  1
  O  O4  8  0.1284  0.0911  0.7185  1
  O  O5  8  0.1306  0.4948  0.8011  1
]