data_[Mg2Np4O16]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Mg  1.3100  1.5000  0.8600
  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 [8.9543]
_cell_length_b [6.7846]
_cell_length_c [5.0288]
_cell_angle_alpha [90.0000]
_cell_angle_beta [103.6512]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [MgNp2O8]
_chemical_formula_sum '[Mg2 Np4 O16]'
_cell_volume [296.8733]
_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
[
  Mg  Mg0  2  0.0000  0.0000  0.0000  1
  Np  Np1  4  0.2053  0.5000  0.4540  1
  O  O2  8  0.1363  0.2037  0.3013  1
  O  O3  4  0.0976  0.5000  0.7251  1
  O  O4  4  0.1723  0.0000  0.7939  1
]