data_[Sr2Ca2Si6]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Sr  0.9500  2.0000  1.3200
  Ca  1.0000  1.8000  1.1400
  Si  1.9000  1.1000  0.5400
]
_symmetry_space_group_name_H-M [I4mm]
_cell_length_a [4.0731]
_cell_length_b [4.0731]
_cell_length_c [15.3276]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [107]
_chemical_formula_structural [SrCaSi3]
_chemical_formula_sum '[Sr2 Ca2 Si6]'
_cell_volume [254.2904]
_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
[
  Sr  Sr0  2  0.0000  0.0000  0.6378  1
  Ca  Ca1  2  0.0000  0.0000  0.9477  1
  Si  Si2  4  0.0000  0.5000  0.2961  1
  Si  Si3  2  0.0000  0.0000  0.3964  1
]