data_[Na4Np2Ni2P4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Np  1.3600  1.7500  1.0000
  Ni  1.9100  1.3500  0.7400
  P  2.1900  1.0000  0.5500
]
_symmetry_space_group_name_H-M [Pmc2_1]
_cell_length_a [4.1463]
_cell_length_b [8.0286]
_cell_length_c [6.7949]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [26]
_chemical_formula_structural [Na2NpNiP2]
_chemical_formula_sum '[Na4 Np2 Ni2 P4]'
_cell_volume [226.1973]
_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  0.1405  0.8464  1
  Na  Na1  2  0.5000  0.0943  0.5082  1
  Np  Np2  2  0.0000  0.4649  0.5094  1
  Ni  Ni3  2  0.5000  0.3314  0.1526  1
  P  P4  2  0.0000  0.2089  0.2425  1
  P  P5  2  0.5000  0.3898  0.7865  1
]