data_[Na2Be2Cr2O6]
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
  Cr  1.6600  1.4000  0.9400
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [P2_1/m]
_cell_length_a [6.4580]
_cell_length_b [3.0014]
_cell_length_c [7.2151]
_cell_angle_alpha [90.0000]
_cell_angle_beta [106.4680]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [11]
_chemical_formula_structural [NaBeCrO3]
_chemical_formula_sum '[Na2 Be2 Cr2 O6]'
_cell_volume [134.1126]
_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  2  0.1930  0.7500  0.1979  1
  Be  Be1  2  0.0799  0.7500  0.6036  1
  Cr  Cr2  2  0.3351  0.2500  0.8506  1
  O  O3  2  0.1170  0.7500  0.8321  1
  O  O4  2  0.1675  0.2500  0.5478  1
  O  O5  2  0.4521  0.2500  0.1381  1
]