data_[Sr1Ca2Si6]
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 [P6/mmm]
_cell_length_a [7.0786]
_cell_length_b [7.0786]
_cell_length_c [4.4520]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [191]
_chemical_formula_structural [Sr(CaSi3)2]
_chemical_formula_sum '[Sr1 Ca2 Si6]'
_cell_volume [193.1918]
_cell_formula_units_Z [1]
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  1  0.0000  0.0000  0.0000  1
  Ca  Ca1  2  0.3333  0.6667  0.0000  1
  Si  Si2  6  0.0000  0.3352  0.5000  1
]