data_[Na4Cu4P4O16]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Cu  1.9000  1.3500  0.8200
  P  2.1900  1.0000  0.5500
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [P2_12_12_1]
_cell_length_a [4.7854]
_cell_length_b [7.0255]
_cell_length_c [9.6989]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [19]
_chemical_formula_structural [NaCuPO4]
_chemical_formula_sum '[Na4 Cu4 P4 O16]'
_cell_volume [326.0786]
_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  0.0084  0.2710  0.3102  1
  Cu  Cu1  4  0.0092  0.4374  0.9598  1
  P  P2  4  0.0612  0.5235  0.6360  1
  O  O3  4  0.1748  0.4719  0.7805  1
  O  O4  4  0.1970  0.3832  0.5311  1
  O  O5  4  0.1975  0.7221  0.5995  1
  O  O6  4  0.2409  0.9768  0.3680  1
]