data_[Ca6Al4Si4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Ca  1.0000  1.8000  1.1400
  Al  1.6100  1.2500  0.6750
  Si  1.9000  1.1000  0.5400
]
_symmetry_space_group_name_H-M [Immm]
_cell_length_a [4.0870]
_cell_length_b [4.5321]
_cell_length_c [18.5497]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [71]
_chemical_formula_structural [Ca3(AlSi)2]
_chemical_formula_sum '[Ca6 Al4 Si4]'
_cell_volume [343.5899]
_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
[
  Ca  Ca0  4  0.0000  0.0000  0.1866  1.0
  Ca  Ca1  2  0.0000  0.5000  0.5000  1.0
  Al  Al2  4  0.0000  0.5000  0.0686  1.0
  Si  Si3  4  0.0000  0.0000  0.3557  1.0
]