data_[Si3Ir3N3]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Si  1.9000  1.1000  0.5400
  Ir  2.2000  1.3500  0.7650
  N  3.0400  0.6500  0.6300
]
_symmetry_space_group_name_H-M [R3m]
_cell_length_a [2.7966]
_cell_length_b [2.7966]
_cell_length_c [16.0744]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [160]
_chemical_formula_structural [SiIrN]
_chemical_formula_sum '[Si3 Ir3 N3]'
_cell_volume [108.8777]
_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
[
  Si  Si0  3  0.0000  0.0000  0.3742  1
  Ir  Ir1  3  0.0000  0.0000  0.2312  1
  N  N2  3  0.0000  0.0000  0.0862  1
]