data_[Cr6Si3Ni3O18]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Cr  1.6600  1.4000  0.9400
  Si  1.9000  1.1000  0.5400
  Ni  1.9100  1.3500  0.7400
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [R3]
_cell_length_a [4.9662]
_cell_length_b [4.9662]
_cell_length_c [13.5226]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [146]
_chemical_formula_structural [Cr2SiNiO6]
_chemical_formula_sum '[Cr6 Si3 Ni3 O18]'
_cell_volume [288.8252]
_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
[
  Cr  Cr0  3  0.0000  0.0000  0.4819  1.0
  Cr  Cr1  3  0.0000  0.0000  0.9864  1.0
  Si  Si2  3  0.0000  0.0000  0.6795  1.0
  Ni  Ni3  3  0.0000  0.0000  0.1881  1.0
  O  O4  9  0.0093  0.3671  0.4112  1.0
  O  O5  9  0.0491  0.6680  0.2562  1.0
]