data_[Na12Sr3Si9O27]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Sr  0.9500  2.0000  1.3200
  Si  1.9000  1.1000  0.5400
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [R32]
_cell_length_a [10.9374]
_cell_length_b [10.9374]
_cell_length_c [6.6692]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [155]
_chemical_formula_structural [Na4Sr(SiO3)3]
_chemical_formula_sum '[Na12 Sr3 Si9 O27]'
_cell_volume [690.9256]
_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
[
  Na  Na0  9  0.0000  0.4733  0.0000  1
  Na  Na1  3  0.0000  0.0000  0.5000  1
  Sr  Sr2  3  0.0000  0.0000  0.0000  1
  Si  Si3  9  0.0000  0.5359  0.5000  1
  O  O4  18  0.0658  0.2021  0.7332  1
  O  O5  9  0.0000  0.7416  0.0000  1
]