data_[Er4Mg12Ag8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Er  1.2400  1.7500  1.0300
  Mg  1.3100  1.5000  0.8600
  Ag  1.9300  1.6000  1.0867
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [16.0729]
_cell_length_b [4.4353]
_cell_length_c [8.3702]
_cell_angle_alpha [90.0000]
_cell_angle_beta [113.7234]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [ErMg3Ag2]
_chemical_formula_sum '[Er4 Mg12 Ag8]'
_cell_volume [546.2714]
_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
[
  Er  Er0  4  0.1183  0.0000  0.1483  1.0
  Mg  Mg1  4  0.0483  0.0000  0.6903  1.0
  Mg  Mg2  4  0.1530  0.5000  0.4902  1.0
  Mg  Mg3  4  0.1863  0.5000  0.8966  1.0
  Ag  Ag4  4  0.0049  0.5000  0.8369  1.0
  Ag  Ag5  4  0.2332  0.0000  0.7208  1.0
]