data_[Rb4Ca2Sn4Se8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Rb  0.8200  2.3500  1.6600
  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 [C2/m]
_cell_length_a [18.0312]
_cell_length_b [4.2443]
_cell_length_c [8.8522]
_cell_angle_alpha [90.0000]
_cell_angle_beta [117.5956]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Rb2Ca(SnSe2)2]
_chemical_formula_sum '[Rb4 Ca2 Sn4 Se8]'
_cell_volume [600.3816]
_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
[
  Rb  Rb0  4  0.1175  0.0000  0.5475  1.0
  Ca  Ca1  2  0.0000  0.0000  0.0000  1.0
  Sn  Sn2  4  0.1917  0.5000  0.0463  1.0
  Se  Se3  4  0.0357  0.5000  0.7948  1.0
  Se  Se4  4  0.1823  0.0000  0.2430  1.0
]