data_[Na4Ca2Sn2As4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Ca  1.0000  1.8000  1.1400
  Sn  1.9600  1.4500  0.8300
  As  2.1800  1.1500  0.6600
]
_symmetry_space_group_name_H-M [Pmc2_1]
_cell_length_a [4.1358]
_cell_length_b [8.7740]
_cell_length_c [8.6301]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [26]
_chemical_formula_structural [Na2CaSnAs2]
_chemical_formula_sum '[Na4 Ca2 Sn2 As4]'
_cell_volume [313.1634]
_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  2  0.0000  0.2028  0.3482  1.0
  Na  Na1  2  0.5000  0.0913  0.0602  1.0
  Ca  Ca2  2  0.0000  0.4348  0.9553  1.0
  Sn  Sn3  2  0.5000  0.2640  0.6438  1.0
  As  As4  2  0.0000  0.1291  0.8116  1.0
  As  As5  2  0.5000  0.4357  0.2265  1.0
]