data_Be2SiSn
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.12
_cell_length_b   5.12
_cell_length_c   5.12
_cell_angle_alpha   137.68
_cell_angle_beta   137.68
_cell_angle_gamma   61.39
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Be2SiSn
_chemical_formula_sum   'Be2 Si1 Sn1'
_cell_volume   60.06
_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
  Be  Be0  1  0.0  0.0  0.0  1.0
  Be  Be1  1  0.85  0.0  0.2  1.0
  Si  Si2  1  0.0  0.0  0.4  1.0
  Sn  Sn3  1  0.0  0.85  0.2  1.0

data_Be2SiSn
_symmetry_space_group_name_H-M   P1
_cell_length_a   3.69
_cell_length_b   3.69
_cell_length_c   5.12
_cell_angle_alpha   111.16
_cell_angle_beta   111.16
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Be2SiSn
_chemical_formula_sum   'Be2 Si1 Sn1'
_cell_volume   60.06
_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
  Be  Be0  1  0.0  0.0  0.0  1.0
  Be  Be1  1  0.2  0.35  0.35  1.0
  Si  Si2  1  0.4  0.4  0.4  1.0
  Sn  Sn3  1  0.35  0.2  0.35  1.0

Be Be Si Sn
Be Be Si Sn 0 1 - o o 0 3 o - o 1 3 + - o 1 2 + o o 2 3 o - o 