data_[Na4Er2Al2Ge4]
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
  Al  1.6100  1.2500  0.6750
  Ge  2.0100  1.2500  0.7700
]
_symmetry_space_group_name_H-M [Pmc2_1]
_cell_length_a [4.2869]
_cell_length_b [8.7584]
_cell_length_c [7.1755]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [26]
_chemical_formula_structural [Na2ErAlGe2]
_chemical_formula_sum '[Na4 Er2 Al2 Ge4]'
_cell_volume [269.4121]
_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  0.1608  0.3440  1.0
  Na  Na1  2  0.5000  0.0821  0.0289  1.0
  Er  Er2  2  0.0000  0.4446  0.9891  1.0
  Al  Al3  2  0.5000  0.3239  0.6545  1.0
  Ge  Ge4  2  0.0000  0.1793  0.7494  1.0
  Ge  Ge5  2  0.5000  0.3909  0.2797  1.0
]