data_Na2BeHg
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.6
_cell_length_b   5.6
_cell_length_c   5.6
_cell_angle_alpha   135.5
_cell_angle_beta   135.5
_cell_angle_gamma   64.76
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Na2BeHg
_chemical_formula_sum   'Na2 Be1 Hg1'
_cell_volume   85.11
_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
  Na  Na2  1  0.0  0.12  0.37  1.0
  Na  Na3  1  0.12  0.0  0.37  1.0
  Be  Be0  1  0.0  0.0  0.0  1.0
  Hg  Hg1  1  0.0  0.0  0.73  1.0

data_Na2BeHg
_symmetry_space_group_name_H-M   Cm
_cell_length_a   6.0
_cell_length_b   6.0
_cell_length_c   5.6
_cell_angle_alpha   90.0
_cell_angle_beta   122.38
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Na2BeHg
_chemical_formula_sum   'Na4 Be2 Hg2'
_cell_volume   170.21
_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
  Na  Na0  4  0.44  0.44  0.24  1.0
  Be  Be1  2  0.0  0.0  0.0  1.0
  Hg  Hg2  2  0.0  0.0  0.73  1.0

Na Na Be Hg