data_[Na4Er2Mg2Pb4]
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
  Mg  1.3100  1.5000  0.8600
  Pb  2.3300  1.8000  1.1225
]
_symmetry_space_group_name_H-M [Pmc2_1]
_cell_length_a [4.9131]
_cell_length_b [9.3626]
_cell_length_c [7.3612]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [26]
_chemical_formula_structural [Na2ErMgPb2]
_chemical_formula_sum '[Na4 Er2 Mg2 Pb4]'
_cell_volume [338.6105]
_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  0.1649  0.3208  1.0
  Na  Na1  2  0.5000  0.0552  0.0338  1.0
  Er  Er2  2  0.0000  0.4723  0.9917  1.0
  Mg  Mg3  2  0.5000  0.3131  0.6688  1.0
  Pb  Pb4  2  0.0000  0.1746  0.7726  1.0
  Pb  Pb5  2  0.5000  0.3788  0.2580  1.0
]