data_[Na4Ca2Be4O8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Ca  1.0000  1.8000  1.1400
  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 [10.8371]
_cell_length_b [3.1651]
_cell_length_c [8.0948]
_cell_angle_alpha [90.0000]
_cell_angle_beta [130.8939]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Na2CaBe2O4]
_chemical_formula_sum '[Na4 Ca2 Be4 O8]'
_cell_volume [209.8852]
_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
[
  Na  Na0  4  0.1495  0.0000  0.7559  1.0
  Ca  Ca1  2  0.0000  0.0000  0.0000  1.0
  Be  Be2  4  0.1535  0.5000  0.3755  1.0
  O  O3  4  0.0340  0.5000  0.8263  1.0
  O  O4  4  0.2447  0.0000  0.3662  1.0
]