data_[Ca3Sm6Sn3O18]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Ca  1.0000  1.8000  1.1400
  Sm  1.1700  1.8500  1.2290
  Sn  1.9600  1.4500  0.8300
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [R-3]
_cell_length_a [5.9285]
_cell_length_b [5.9285]
_cell_length_c [14.5419]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [148]
_chemical_formula_structural [CaSm2SnO6]
_chemical_formula_sum '[Ca3 Sm6 Sn3 O18]'
_cell_volume [442.6282]
_cell_formula_units_Z [3]
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  3  -0.0000  0.0000  0.5000  1.0
  Sm  Sm1  6  0.0000  0.0000  0.2197  1.0
  Sn  Sn2  3  0.0000  0.0000  0.0000  1.0
  O  O3  18  0.0260  0.7351  0.0891  1.0
]