data_[Rb4Sm2Ag4Se8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Rb  0.8200  2.3500  1.6600
  Sm  1.1700  1.8500  1.2290
  Ag  1.9300  1.6000  1.0867
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [15.8047]
_cell_length_b [4.2548]
_cell_length_c [8.3521]
_cell_angle_alpha [90.0000]
_cell_angle_beta [108.6682]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Rb2Sm(AgSe2)2]
_chemical_formula_sum '[Rb4 Sm2 Ag4 Se8]'
_cell_volume [532.0878]
_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  0.1306  0.0000  0.5628  1.0
  Sm  Sm1  2  0.0000  0.0000  0.0000  1.0
  Ag  Ag2  4  0.1792  0.5000  0.9836  1.0
  Se  Se3  4  0.0137  0.5000  0.7643  1.0
  Se  Se4  4  0.1974  0.0000  0.1888  1.0
]