data_[Gd4Er4Mg8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Gd  1.2000  1.8000  1.0750
  Er  1.2400  1.7500  1.0300
  Mg  1.3100  1.5000  0.8600
]
_symmetry_space_group_name_H-M [Ama2]
_cell_length_a [5.4561]
_cell_length_b [12.0492]
_cell_length_c [6.7061]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [40]
_chemical_formula_structural [GdErMg2]
_chemical_formula_sum '[Gd4 Er4 Mg8]'
_cell_volume [440.8657]
_cell_formula_units_Z [4]
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
[
  Gd  Gd0  4  0.2500  0.4225  0.2627  1
  Er  Er1  4  0.2500  0.1664  0.4905  1
  Mg  Mg2  4  0.2500  0.1747  0.9943  1
  Mg  Mg3  4  0.2500  0.4180  0.7525  1
]