data_[Sr2Si12N16]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Sr  0.9500  2.0000  1.3200
  Si  1.9000  1.1000  0.5400
  N  3.0400  0.6500  0.6300
]
_symmetry_space_group_name_H-M [Imm2]
_cell_length_a [7.9341]
_cell_length_b [9.3503]
_cell_length_c [4.8430]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [44]
_chemical_formula_structural [Sr(Si3N4)2]
_chemical_formula_sum '[Sr2 Si12 N16]'
_cell_volume [359.2828]
_cell_formula_units_Z [2]
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  2  0.0000  0.5000  0.1572  1.0
  Si  Si1  8  0.2033  0.1603  0.1481  1.0
  Si  Si2  4  0.0000  0.1270  0.6402  1.0
  N  N3  8  0.1820  0.1975  0.7936  1.0
  N  N4  4  0.0000  0.1839  0.2947  1.0
  N  N5  4  0.2083  0.5000  0.7154  1.0
]