data_KNaNb
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.21
_cell_length_b   10.06
_cell_length_c   2.97
_cell_angle_alpha   84.52
_cell_angle_beta   78.67
_cell_angle_gamma   16.82
_symmetry_Int_Tables_number   1
_chemical_formula_structural   KNaNb
_chemical_formula_sum   'K1 Na1 Nb1'
_cell_volume   81.71
_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
  K  K0  1  0.69  0.44  0.64  1.0
  Na  Na1  1  0.69  0.44  0.52  1.0
  Nb  Nb2  1  0.69  0.44  0.49  1.0

data_KNaNb
_symmetry_space_group_name_H-M   Cm
_cell_length_a   3.38
_cell_length_b   19.83
_cell_length_c   2.97
_cell_angle_alpha   90.0
_cell_angle_beta   124.69
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   KNaNb
_chemical_formula_sum   'K2 Na2 Nb2'
_cell_volume   163.41
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  'x, -y, z'
  3  'x+1/2, y+1/2, z'
  4  'x+1/2, -y+1/2, 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
  K  K0  2  0.23  0.0  0.67  1.0
  Na  Na1  2  0.35  0.0  0.79  1.0
  Nb  Nb2  2  0.38  0.0  0.82  1.0

K Na Nb