data_[Rb4Si8N12]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Rb  0.8200  2.3500  1.6600
  Si  1.9000  1.1000  0.5400
  N  3.0400  0.6500  0.6300
]
_symmetry_space_group_name_H-M [Cmc2_1]
_cell_length_a [9.6362]
_cell_length_b [5.7849]
_cell_length_c [5.1080]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [36]
_chemical_formula_structural [RbSi2N3]
_chemical_formula_sum '[Rb4 Si8 N12]'
_cell_volume [284.7440]
_cell_formula_units_Z [4]
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
[
  Rb  Rb0  4  0.0000  0.3537  0.0144  1.0
  Si  Si1  8  0.1744  0.1374  0.5113  1.0
  N  N2  8  0.2403  0.1196  0.1775  1.0
  N  N3  4  0.0000  0.1587  0.5200  1.0
]