data_[Na8Mg4Sn8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Mg  1.3100  1.5000  0.8600
  Sn  1.9600  1.4500  0.8300
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [11.0392]
_cell_length_b [5.1345]
_cell_length_c [10.4699]
_cell_angle_alpha [90.0000]
_cell_angle_beta [109.4845]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Na2MgSn2]
_chemical_formula_sum '[Na8 Mg4 Sn8]'
_cell_volume [559.4594]
_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
[
  Na  Na0  4  0.0272  0.5000  0.3345  1.0
  Na  Na1  4  0.1671  0.5000  0.0670  1.0
  Mg  Mg2  4  0.2263  0.0000  0.3654  1.0
  Sn  Sn3  4  0.0149  0.0000  0.8633  1.0
  Sn  Sn4  4  0.1281  0.0000  0.6120  1.0
]