data_[Ac4Be4Si4N2]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Ac  1.1000  1.9500  1.2600
  Be  1.5700  1.0500  0.5900
  Si  1.9000  1.1000  0.5400
  N  3.0400  0.6500  0.6300
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [11.7214]
_cell_length_b [3.9697]
_cell_length_c [7.2192]
_cell_angle_alpha [90.0000]
_cell_angle_beta [126.9597]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Ac2Be2Si2N]
_chemical_formula_sum '[Ac4 Be4 Si4 N2]'
_cell_volume [268.4135]
_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
[
  Ac  Ac0  4  0.0435  0.5000  0.2880  1
  Be  Be1  4  0.1638  0.0000  0.0877  1
  Si  Si2  4  0.2045  0.0000  0.7857  1
  N  N3  2  0.0000  0.0000  0.0000  1
]