data_[Si4Ni8P16O56]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Si  1.9000  1.1000  0.5400
  Ni  1.9100  1.3500  0.7400
  P  2.1900  1.0000  0.5500
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [C2/c]
_cell_length_a [16.8001]
_cell_length_b [4.8449]
_cell_length_c [12.1427]
_cell_angle_alpha [90.0000]
_cell_angle_beta [104.0346]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [15]
_chemical_formula_structural [SiNi2(P2O7)2]
_chemical_formula_sum '[Si4 Ni8 P16 O56]'
_cell_volume [958.8481]
_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
[
  Si  Si0  4  0.0000  0.3268  0.2500  1
  Ni  Ni1  8  0.2475  0.3523  0.6292  1
  P  P2  8  0.1252  0.1224  0.1341  1
  P  P3  8  0.1366  0.3294  0.9146  1
  O  O4  8  0.0424  0.1316  0.1729  1
  O  O5  8  0.0660  0.4746  0.8283  1
  O  O6  8  0.0928  0.2812  0.0157  1
  O  O7  8  0.1420  0.1744  0.6164  1
  O  O8  8  0.1522  0.0581  0.8653  1
  O  O9  8  0.1944  0.2966  0.2061  1
  O  O10  8  0.2085  0.4757  0.4559  1
]