data_[Sr6Gd3As3O18]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Sr  0.9500  2.0000  1.3200
  Gd  1.2000  1.8000  1.0750
  As  2.1800  1.1500  0.6600
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [R-3]
_cell_length_a [5.8064]
_cell_length_b [5.8064]
_cell_length_c [13.9868]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [148]
_chemical_formula_structural [Sr2GdAsO6]
_chemical_formula_sum '[Sr6 Gd3 As3 O18]'
_cell_volume [408.3738]
_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
[
  Sr  Sr0  6  0.0000  0.0000  0.2533  1.0
  Gd  Gd1  3  0.0000  0.0000  0.0000  1.0
  As  As2  3  -0.0000  0.0000  0.5000  1.0
  O  O3  18  0.0346  0.5722  0.2438  1.0
]