data_KHg2As
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.7
_cell_length_b   5.19
_cell_length_c   5.8
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   KHg2As
_chemical_formula_sum   'K1 Hg2 As1'
_cell_volume   111.27
_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  K3  1  0.0  0.0  0.0  1.0
  Hg  Hg1  1  0.85  0.59  0.0  1.0
  Hg  Hg2  1  0.0  0.59  0.9  1.0
  As  As0  1  0.85  0.0  0.9  1.0

data_KHg2As
_symmetry_space_group_name_H-M   P1
_cell_length_a   3.7
_cell_length_b   5.19
_cell_length_c   5.8
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   KHg2As
_chemical_formula_sum   'K1 Hg2 As1'
_cell_volume   111.27
_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  0.0  0.0  1.0
  Hg  Hg1  1  0.0  0.59  0.9  1.0
  Hg  Hg2  1  0.85  0.59  0.0  1.0
  As  As3  1  0.85  0.0  0.9  1.0

K Hg Hg As
K Hg Hg As 0 3 - o - 1 2 + o - 