data_[Er16Mg2Ag4]
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 [8.6504]
_cell_length_b [14.2531]
_cell_length_c [5.4220]
_cell_angle_alpha [90.0000]
_cell_angle_beta [109.3083]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Er8MgAg2]
_chemical_formula_sum '[Er16 Mg2 Ag4]'
_cell_volume [630.9020]
_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
[
  Er  Er0  8  0.2089  0.1170  0.1030  1
  Er  Er1  4  0.0000  0.2303  0.5000  1
  Er  Er2  4  0.1030  0.5000  0.3018  1
  Mg  Mg3  2  0.0000  0.0000  0.5000  1
  Ag  Ag4  4  0.0000  0.3045  0.0000  1
]