data_[Ac4Nb2O10]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Ac  1.1000  1.9500  1.2600
  Nb  1.6000  1.4500  0.8200
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [10.8369]
_cell_length_b [4.4814]
_cell_length_c [7.0979]
_cell_angle_alpha [90.0000]
_cell_angle_beta [123.2727]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Ac2NbO5]
_chemical_formula_sum '[Ac4 Nb2 O10]'
_cell_volume [288.2002]
_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
[
  Ac  Ac0  4  0.2131  0.5000  0.7420  1
  Nb  Nb1  2  0.0000  0.5000  0.0000  1
  O  O2  4  0.0480  0.5000  0.3164  1
  O  O3  4  0.2264  0.5000  0.1113  1
  O  O4  2  0.0000  0.0000  0.0000  1
]