data_[Ca4Sn2Se8]
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
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [Cmmm]
_cell_length_a [8.5528]
_cell_length_b [11.8954]
_cell_length_c [4.0469]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [65]
_chemical_formula_structural [Ca2SnSe4]
_chemical_formula_sum '[Ca4 Sn2 Se8]'
_cell_volume [411.7239]
_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
[
  Ca  Ca0  4  0.2500  0.2500  0.5000  1.0
  Sn  Sn1  2  0.0000  0.0000  0.0000  1.0
  Se  Se2  4  0.0000  0.2334  0.0000  1.0
  Se  Se3  4  0.2235  0.0000  0.5000  1.0
]