data_[Na4Ca4Np2O12]
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
  Np  1.3600  1.7500  1.0000
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [6.0223]
_cell_length_b [10.1358]
_cell_length_c [5.9116]
_cell_angle_alpha [90.0000]
_cell_angle_beta [109.2654]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Na2Ca2NpO6]
_chemical_formula_sum '[Na4 Ca4 Np2 O12]'
_cell_volume [340.6407]
_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  4  0.0000  0.1675  0.0000  1
  Ca  Ca1  4  0.0000  0.3370  0.5000  1
  Np  Np2  2  0.0000  0.0000  0.5000  1
  O  O3  8  0.2073  0.1545  0.7006  1
  O  O4  4  0.2219  0.0000  0.2987  1
]