data_[Tb12Er2Mg4]
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/m]
_cell_length_a [8.8285]
_cell_length_b [9.4672]
_cell_length_c [6.5236]
_cell_angle_alpha [90.0000]
_cell_angle_beta [97.6415]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Tb6ErMg2]
_chemical_formula_sum '[Tb12 Er2 Mg4]'
_cell_volume [540.4097]
_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
[
  Tb  Tb0  8  0.1648  0.1714  0.1804  1.0
  Tb  Tb1  4  0.1654  0.0000  0.6736  1.0
  Er  Er2  2  0.0000  0.5000  0.0000  1.0
  Mg  Mg3  4  0.0000  0.3476  0.5000  1.0
]