data_[Sm20Mg4Sb8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Sm  1.1700  1.8500  1.2290
  Mg  1.3100  1.5000  0.8600
  Sb  2.0500  1.4500  0.8300
]
_symmetry_space_group_name_H-M [Cmcm]
_cell_length_a [4.0494]
_cell_length_b [11.9047]
_cell_length_c [19.7721]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [63]
_chemical_formula_structural [Sm5MgSb2]
_chemical_formula_sum '[Sm20 Mg4 Sb8]'
_cell_volume [953.1458]
_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
[
  Sm  Sm0  8  0.0000  0.0548  0.1089  1
  Sm  Sm1  8  0.0000  0.3579  0.0286  1
  Sm  Sm2  4  0.0000  0.4173  0.2500  1
  Mg  Mg3  4  0.0000  0.1573  0.2500  1
  Sb  Sb4  8  0.0000  0.2311  0.6480  1
]