data_[Eu1Er1H2I2]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Eu  1.2000  1.8500  1.1985
  Er  1.2400  1.7500  1.0300
  H  2.2000  0.2500  0.0000
  I  2.6600  1.4000  1.2733
]
_symmetry_space_group_name_H-M [P4mm]
_cell_length_a [3.8927]
_cell_length_b [3.8927]
_cell_length_c [9.4088]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [99]
_chemical_formula_structural [EuEr(HI)2]
_chemical_formula_sum '[Eu1 Er1 H2 I2]'
_cell_volume [142.5740]
_cell_formula_units_Z [1]
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
[
  Eu  Eu0  1  0.5000  0.5000  0.8553  1
  Er  Er1  1  0.0000  0.0000  0.1358  1
  H  H2  2  0.0000  0.5000  0.0176  1
  I  I3  1  0.0000  0.0000  0.6671  1
  I  I4  1  0.5000  0.5000  0.3067  1
]