data_[Sr6Ga6Ni3O18]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Sr  0.9500  2.0000  1.3200
  Ga  1.8100  1.3000  0.7600
  Ni  1.9100  1.3500  0.7400
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [R-3m]
_cell_length_a [5.8033]
_cell_length_b [5.8033]
_cell_length_c [16.6337]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [166]
_chemical_formula_structural [Sr2Ga2NiO6]
_chemical_formula_sum '[Sr6 Ga6 Ni3 O18]'
_cell_volume [485.1477]
_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  0.2029  1
  Ga  Ga1  6  0.0000  0.0000  0.4120  1
  Ni  Ni2  3  0.0000  0.0000  0.0000  1
  O  O3  18  0.0202  0.5101  0.7514  1
]