data_[Ca8H8Br4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Ca  1.0000  1.8000  1.1400
  H  2.2000  0.2500  0.0000
  Br  2.9600  1.1500  0.8825
]
_symmetry_space_group_name_H-M [I4_1md]
_cell_length_a [6.8618]
_cell_length_b [6.8618]
_cell_length_c [11.1221]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [109]
_chemical_formula_structural [Ca2H2Br]
_chemical_formula_sum '[Ca8 H8 Br4]'
_cell_volume [523.6701]
_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
[
  Ca  Ca0  8  0.0000  0.2398  0.4451  1
  H  H1  8  0.0000  0.2907  0.6504  1
  Br  Br2  4  0.0000  0.0000  0.9896  1
]