data_K2FeSn
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.51
_cell_length_b   6.51
_cell_length_c   6.51
_cell_angle_alpha   145.92
_cell_angle_beta   138.79
_cell_angle_gamma   54.52
_symmetry_Int_Tables_number   1
_chemical_formula_structural   K2FeSn
_chemical_formula_sum   'K2 Fe1 Sn1'
_cell_volume   101.11
_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  K1  1  0.91  0.0  0.68  1.0
  K  K2  1  0.0  0.29  0.1  1.0
  Fe  Fe0  1  0.0  0.0  0.0  1.0
  Sn  Sn3  1  0.0  0.0  0.79  1.0

data_K2FeSn
_symmetry_space_group_name_H-M   P1
_cell_length_a   3.81
_cell_length_b   4.58
_cell_length_c   6.51
_cell_angle_alpha   110.61
_cell_angle_beta   107.04
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   K2FeSn
_chemical_formula_sum   'K2 Fe1 Sn1'
_cell_volume   101.11
_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  0.23  0.32  0.23  1.0
  K  K1  1  0.9  0.19  0.19  1.0
  Fe  Fe2  1  0.0  0.0  0.0  1.0
  Sn  Sn3  1  0.21  0.21  0.21  1.0

K K Fe Sn
K K Fe Sn 0 3 + o o 0 1 + o + 1 3 o o - 1 2 o o o 2 3 o o - 