data_[Na4Ni4As4O16]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Ni  1.9100  1.3500  0.7400
  As  2.1800  1.1500  0.6600
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [Cmcm]
_cell_length_a [5.5819]
_cell_length_b [8.7655]
_cell_length_c [6.8600]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [63]
_chemical_formula_structural [NaNiAsO4]
_chemical_formula_sum '[Na4 Ni4 As4 O16]'
_cell_volume [335.6474]
_cell_formula_units_Z [4]
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  0.1822  0.7500  1.0
  Ni  Ni1  4  0.0000  0.5000  0.0000  1.0
  As  As2  4  0.0000  0.1624  0.2500  1.0
  O  O3  8  0.0000  0.2750  0.0486  1.0
  O  O4  8  0.2498  0.0412  0.2500  1.0
]