data_[Na8Be4O8]
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
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [11.1106]
_cell_length_b [4.3311]
_cell_length_c [7.6738]
_cell_angle_alpha [90.0000]
_cell_angle_beta [131.4067]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Na2BeO2]
_chemical_formula_sum '[Na8 Be4 O8]'
_cell_volume [276.9644]
_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  0.0711  0.0000  0.7734  1.0
  Na  Na1  4  0.1726  0.5000  0.5305  1.0
  Be  Be2  4  0.1205  0.5000  0.1391  1.0
  O  O3  4  0.0306  0.5000  0.8720  1.0
  O  O4  4  0.2055  0.0000  0.6415  1.0
]