data_AlHgAs2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.72
_cell_length_b   4.5
_cell_length_c   4.9
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   AlHgAs2
_chemical_formula_sum   'Al1 Hg1 As2'
_cell_volume   82.01
_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
  Al  Al0  1  0.0  0.0  0.0  1.0
  Hg  Hg3  1  0.86  0.0  0.45  1.0
  As  As1  1  0.0  0.25  0.45  1.0
  As  As2  1  0.86  0.25  0.0  1.0

data_AlHgAs2
_symmetry_space_group_name_H-M   P1
_cell_length_a   3.72
_cell_length_b   4.5
_cell_length_c   4.9
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   AlHgAs2
_chemical_formula_sum   'Al1 Hg1 As2'
_cell_volume   82.01
_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
  Al  Al0  1  0.0  0.0  0.0  1.0
  Hg  Hg1  1  0.86  0.0  0.45  1.0
  As  As2  1  -0.0  0.25  0.45  1.0
  As  As3  1  0.86  0.25  0.0  1.0

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