data_[Ca20Sn12]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Ca  1.0000  1.8000  1.1400
  Sn  1.9600  1.4500  0.8300
]
_symmetry_space_group_name_H-M [I4/mcm]
_cell_length_a [8.1294]
_cell_length_b [8.1294]
_cell_length_c [15.5906]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [140]
_chemical_formula_structural [Ca5Sn3]
_chemical_formula_sum '[Ca20 Sn12]'
_cell_volume [1030.3466]
_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
[
  Ca  Ca0  16  0.1746  0.3254  0.6428  1.0
  Ca  Ca1  4  0.0000  0.0000  0.0000  1.0
  Sn  Sn2  8  0.1257  0.6257  0.5000  1.0
  Sn  Sn3  4  0.0000  0.0000  0.2500  1.0
]