data_Na2NbZn
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   2.97
_cell_length_b   2.97
_cell_length_c   10.08
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   91.36
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Na2NbZn
_chemical_formula_sum   'Na2 Nb1 Zn1'
_cell_volume   88.78
_cell_formula_units_Z   1
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  1  0.07  0.0  0.44  1.0
  Na  Na1  1  0.0  0.0  0.3  1.0
  Nb  Nb2  1  0.07  0.0  0.58  1.0
  Zn  Zn3  1  0.0  0.0  0.8  1.0

data_Na2NbZn
_symmetry_space_group_name_H-M   Pm
_cell_length_a   2.97
_cell_length_b   2.97
_cell_length_c   10.08
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   6
_chemical_formula_structural   Na2NbZn
_chemical_formula_sum   'Na2 Nb1 Zn1'
_cell_volume   88.8
_cell_formula_units_Z   1
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '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  1  0.0  0.0  0.3  1.0
  Na  Na1  1  0.07  0.0  0.44  1.0
  Nb  Nb2  1  0.07  0.0  0.58  1.0
  Zn  Zn3  1  0.0  0.0  0.8  1.0

Na Na Nb Zn
Na Na Nb Zn 0 1 o o o 0 2 o o o 2 3 o o o 