data_[Sr2Nb2Si4O14]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Sr  0.9500  2.0000  1.3200
  Nb  1.6000  1.4500  0.8200
  Si  1.9000  1.1000  0.5400
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [C2]
_cell_length_a [7.0217]
_cell_length_b [8.7424]
_cell_length_c [4.7324]
_cell_angle_alpha [90.0000]
_cell_angle_beta [98.8876]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [5]
_chemical_formula_structural [SrNbSi2O7]
_chemical_formula_sum '[Sr2 Nb2 Si4 O14]'
_cell_volume [287.0190]
_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
[
  Sr  Sr0  2  0.0000  0.2863  0.5000  1.0
  Nb  Nb1  2  0.0000  0.6813  0.5000  1.0
  Si  Si2  4  0.2101  0.0071  0.9257  1.0
  O  O3  4  0.1374  0.5015  0.7802  1.0
  O  O4  4  0.1759  0.8472  0.7458  1.0
  O  O5  4  0.2163  0.6418  0.2817  1.0
  O  O6  2  0.0000  0.0766  0.0000  1.0
]