data_[Ca8Sn4N8]
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
  N  3.0400  0.6500  0.6300
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [10.7373]
_cell_length_b [4.9737]
_cell_length_c [6.7213]
_cell_angle_alpha [90.0000]
_cell_angle_beta [111.1015]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Ca2SnN2]
_chemical_formula_sum '[Ca8 Sn4 N8]'
_cell_volume [334.8735]
_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  4  0.0073  0.0000  0.2439  1
  Ca  Ca1  4  0.1659  0.5000  0.0826  1
  Sn  Sn2  4  0.1673  0.5000  0.5917  1
  N  N3  4  0.0032  0.5000  0.7234  1
  N  N4  4  0.1713  0.0000  0.0921  1
]