data_[Na2Er2Be2O6]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Er  1.2400  1.7500  1.0300
  Be  1.5700  1.0500  0.5900
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [P2_1/m]
_cell_length_a [6.8166]
_cell_length_b [3.2755]
_cell_length_c [7.3130]
_cell_angle_alpha [90.0000]
_cell_angle_beta [101.2002]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [11]
_chemical_formula_structural [NaErBeO3]
_chemical_formula_sum '[Na2 Er2 Be2 O6]'
_cell_volume [160.1711]
_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  0.1619  0.7500  0.1755  1
  Er  Er1  2  0.3491  0.2500  0.8276  1
  Be  Be2  2  0.0634  0.7500  0.6013  1
  O  O3  2  0.1169  0.7500  0.8216  1
  O  O4  2  0.1493  0.2500  0.5346  1
  O  O5  2  0.4259  0.2500  0.1398  1
]