data_[Na8Sr6As8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Sr  0.9500  2.0000  1.3200
  As  2.1800  1.1500  0.6600
]
_symmetry_space_group_name_H-M [Immm]
_cell_length_a [4.7854]
_cell_length_b [7.7684]
_cell_length_c [15.6994]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [71]
_chemical_formula_structural [Na4Sr3As4]
_chemical_formula_sum '[Na8 Sr6 As8]'
_cell_volume [583.6226]
_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
[
  Na  Na0  8  0.0000  0.1999  0.1758  1.0
  Sr  Sr1  4  0.0000  0.0000  0.3768  1.0
  Sr  Sr2  2  0.0000  0.5000  0.5000  1.0
  As  As3  4  0.0000  0.3344  0.0000  1.0
  As  As4  4  0.0000  0.5000  0.2911  1.0
]