data_K2CuSi
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.18
_cell_length_b   6.18
_cell_length_c   6.18
_cell_angle_alpha   138.44
_cell_angle_beta   136.96
_cell_angle_gamma   61.37
_symmetry_Int_Tables_number   1
_chemical_formula_structural   K2CuSi
_chemical_formula_sum   'K2 Cu1 Si1'
_cell_volume   105.69
_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  0.0  0.27  0.58  1.0
  K  K2  1  0.19  0.0  0.73  1.0
  Cu  Cu0  1  0.0  0.0  0.32  1.0
  Si  Si3  1  0.0  0.0  0.0  1.0

data_K2CuSi
_symmetry_space_group_name_H-M   P1
_cell_length_a   4.39
_cell_length_b   4.53
_cell_length_c   6.18
_cell_angle_alpha   111.52
_cell_angle_beta   110.78
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   K2CuSi
_chemical_formula_sum   'K2 Cu1 Si1'
_cell_volume   105.69
_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  0.0  0.73  0.54  1.0
  K  K1  1  0.73  0.31  0.31  1.0
  Si  Si2  1  0.0  0.0  0.0  1.0
  Cu  Cu3  1  0.0  0.32  0.32  1.0

K K Cu Si