data_[Be2Fe2Si4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Be  1.5700  1.0500  0.5900
  Fe  1.8300  1.4000  0.8525
  Si  1.9000  1.1000  0.5400
]
_symmetry_space_group_name_H-M [Cm]
_cell_length_a [8.1799]
_cell_length_b [2.6776]
_cell_length_c [4.0166]
_cell_angle_alpha [90.0000]
_cell_angle_beta [96.2282]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [8]
_chemical_formula_structural [BeFeSi2]
_chemical_formula_sum '[Be2 Fe2 Si4]'
_cell_volume [87.4540]
_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
[
  Be  Be0  2  0.0082  0.5000  0.4997  1
  Fe  Fe1  2  0.2515  0.0000  0.7602  1
  Si  Si2  2  0.2518  0.5000  0.2726  1
  Si  Si3  2  0.4885  0.5000  0.9674  1
]