data_[Tb20Er4Mg4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Tb  1.1000  1.7500  0.9815
  Er  1.2400  1.7500  1.0300
  Mg  1.3100  1.5000  0.8600
]
_symmetry_space_group_name_H-M [C2/c]
_cell_length_a [11.0394]
_cell_length_b [6.5042]
_cell_length_c [12.4447]
_cell_angle_alpha [90.0000]
_cell_angle_beta [98.4384]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [15]
_chemical_formula_structural [Tb5ErMg]
_chemical_formula_sum '[Tb20 Er4 Mg4]'
_cell_volume [883.8880]
_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  8  0.1597  0.4487  0.5625  1
  Tb  Tb1  8  0.2420  0.0579  0.1680  1
  Tb  Tb2  4  0.0000  0.2031  0.7500  1
  Er  Er3  4  0.0000  0.2866  0.2500  1
  Mg  Mg4  4  0.0000  0.0000  0.0000  1
]