data_[Ac4Er4Cu4Ag4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Ac  1.1000  1.9500  1.2600
  Er  1.2400  1.7500  1.0300
  Cu  1.9000  1.3500  0.8200
  Ag  1.9300  1.6000  1.0867
]
_symmetry_space_group_name_H-M [F-43m]
_cell_length_a [7.4623]
_cell_length_b [7.4623]
_cell_length_c [7.4623]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [216]
_chemical_formula_structural [AcErCuAg]
_chemical_formula_sum '[Ac4 Er4 Cu4 Ag4]'
_cell_volume [415.5369]
_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
[
  Ac  Ac0  4  0.0000  0.0000  0.5000  1
  Er  Er1  4  0.0000  0.0000  0.0000  1
  Cu  Cu2  4  0.2500  0.2500  0.2500  1
  Ag  Ag3  4  0.2500  0.2500  0.7500  1
]