data_[Tb4Mg12Cu8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Tb  1.1000  1.7500  0.9815
  Mg  1.3100  1.5000  0.8600
  Cu  1.9000  1.3500  0.8200
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [14.9646]
_cell_length_b [3.7880]
_cell_length_c [10.6571]
_cell_angle_alpha [90.0000]
_cell_angle_beta [123.0406]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [TbMg3Cu2]
_chemical_formula_sum '[Tb4 Mg12 Cu8]'
_cell_volume [506.4115]
_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
[
  Tb  Tb0  4  0.1425  0.0000  0.7276  1
  Mg  Mg1  4  0.0743  0.5000  0.9376  1
  Mg  Mg2  4  0.0761  0.5000  0.4194  1
  Mg  Mg3  4  0.1463  0.0000  0.2333  1
  Cu  Cu4  4  0.2260  0.0000  0.0511  1
  Cu  Cu5  4  0.2266  0.0000  0.5456  1
]