data_[Na2Er2Be4F16]
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
  F  3.9800  0.5000  0.7050
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [8.3122]
_cell_length_b [5.5330]
_cell_length_c [7.3844]
_cell_angle_alpha [90.0000]
_cell_angle_beta [91.3959]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [NaErBe2F8]
_chemical_formula_sum '[Na2 Er2 Be4 F16]'
_cell_volume [339.5222]
_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  0.0000  0.0000  0.5000  1.0
  Er  Er1  2  0.0000  0.0000  0.0000  1.0
  Be  Be2  4  0.1432  0.5000  0.2414  1.0
  F  F3  8  0.0333  0.2633  0.2183  1.0
  F  F4  4  0.2420  0.5000  0.4105  1.0
  F  F5  4  0.2474  0.5000  0.0612  1.0
]