data_[Na4Mg2Sn8]
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 [Cmmm]
_cell_length_a [6.0589]
_cell_length_b [13.9155]
_cell_length_c [5.5741]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [65]
_chemical_formula_structural [Na2MgSn4]
_chemical_formula_sum '[Na4 Mg2 Sn8]'
_cell_volume [469.9680]
_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
[
  Na  Na0  4  0.0000  0.1513  0.5000  1
  Mg  Mg1  2  0.0000  0.5000  0.0000  1
  Sn  Sn2  4  0.0000  0.2897  0.0000  1
  Sn  Sn3  4  0.0000  0.3946  0.5000  1
]