data_[Na4Er2Zn2Sn4]
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
  Zn  1.6500  1.3500  0.8800
  Sn  1.9600  1.4500  0.8300
]
_symmetry_space_group_name_H-M [Pmc2_1]
_cell_length_a [4.6968]
_cell_length_b [8.8654]
_cell_length_c [7.5123]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [26]
_chemical_formula_structural [Na2ErZnSn2]
_chemical_formula_sum '[Na4 Er2 Zn2 Sn4]'
_cell_volume [312.8053]
_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  0.1536  0.3298  1.0
  Na  Na1  2  0.5000  0.0771  0.0216  1.0
  Er  Er2  2  0.0000  0.4817  0.0191  1.0
  Zn  Zn3  2  0.5000  0.3103  0.6396  1.0
  Sn  Sn4  2  0.0000  0.1960  0.7593  1.0
  Sn  Sn5  2  0.5000  0.3879  0.2762  1.0
]