data_[Sm8Y4Mg8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Sm  1.1700  1.8500  1.2290
  Y  1.2200  1.8000  1.0400
  Mg  1.3100  1.5000  0.8600
]
_symmetry_space_group_name_H-M [Cmcm]
_cell_length_a [3.8044]
_cell_length_b [28.1742]
_cell_length_c [5.4652]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [63]
_chemical_formula_structural [Sm2YMg2]
_chemical_formula_sum '[Sm8 Y4 Mg8]'
_cell_volume [585.7879]
_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  4  0.0000  0.0443  0.2500  1
  Sm  Sm1  4  0.0000  0.2366  0.2500  1
  Y  Y2  4  0.0000  0.1500  0.7500  1
  Mg  Mg3  4  0.0000  0.3603  0.7500  1
  Mg  Mg4  4  0.0000  0.4457  0.2500  1
]