data_[Sm12Sn2As4Se6]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Sm  1.1700  1.8500  1.2290
  Sn  1.9600  1.4500  0.8300
  As  2.1800  1.1500  0.6600
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [18.4823]
_cell_length_b [4.2409]
_cell_length_c [8.5067]
_cell_angle_alpha [90.0000]
_cell_angle_beta [103.1210]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Sm6SnAs2Se3]
_chemical_formula_sum '[Sm12 Sn2 As4 Se6]'
_cell_volume [649.3614]
_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
[
  Sm  Sm0  4  0.0028  0.0000  0.2576  1.0
  Sm  Sm1  4  0.1691  0.5000  0.0927  1.0
  Sm  Sm2  4  0.1700  0.5000  0.5773  1.0
  Sn  Sn3  2  0.0000  0.5000  0.0000  1.0
  As  As4  4  0.1677  0.0000  0.3352  1.0
  Se  Se5  4  0.1660  0.0000  0.8318  1.0
  Se  Se6  2  0.0000  0.5000  0.5000  1.0
]