data_[La4Mg4Si4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  La  1.1000  1.9500  1.1720
  Mg  1.3100  1.5000  0.8600
  Si  1.9000  1.1000  0.5400
]
_symmetry_space_group_name_H-M [Pnma]
_cell_length_a [7.5050]
_cell_length_b [4.4049]
_cell_length_c [8.7937]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [62]
_chemical_formula_structural [LaMgSi]
_chemical_formula_sum '[La4 Mg4 Si4]'
_cell_volume [290.7120]
_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
[
  La  La0  4  0.0220  0.2500  0.8255  1.0
  Mg  Mg1  4  0.1432  0.2500  0.4408  1.0
  Si  Si2  4  0.2250  0.7500  0.6152  1.0
]