data_[Sr21Ca15]
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
]
_symmetry_space_group_name_H-M [R-3m]
_cell_length_a [6.5032]
_cell_length_b [6.5032]
_cell_length_c [50.2946]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [166]
_chemical_formula_structural [Sr7Ca5]
_chemical_formula_sum '[Sr21 Ca15]'
_cell_volume [1842.0557]
_cell_formula_units_Z [3]
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  6  0.0000  0.0000  0.0745  1
  Sr  Sr1  6  0.0000  0.0000  0.2249  1
  Sr  Sr2  6  0.0000  0.0000  0.3068  1
  Sr  Sr3  3  -0.0000  -0.0000  0.5000  1
  Ca  Ca4  6  0.0000  0.0000  0.1494  1
  Ca  Ca5  6  0.0000  0.0000  0.3916  1
  Ca  Ca6  3  0.0000  0.0000  0.0000  1
]