data_LaBeTlSn
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.21
_cell_length_b   5.21
_cell_length_c   5.21
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   LaBeTlSn
_chemical_formula_sum   'La1 Be1 Tl1 Sn1'
_cell_volume   100.27
_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
  La  La1  1  0.53  0.53  0.53  1.0
  Be  Be0  1  0.0  0.0  0.0  1.0
  Tl  Tl3  1  0.69  0.69  0.69  1.0
  Sn  Sn2  1  0.84  0.84  0.84  1.0

data_LaBeTlSn
_symmetry_space_group_name_H-M   R3m
_cell_length_a   5.21
_cell_length_b   5.21
_cell_length_c   12.77
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   LaBeTlSn
_chemical_formula_sum   'La3 Be3 Tl3 Sn3'
_cell_volume   300.82
_cell_formula_units_Z   3
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-y, x-y, z'
  3  '-x+y, -x, z'
  4  '-y, -x, z'
  5  '-x+y, y, z'
  6  'x, x-y, z'
  7  'x+1/3, y+2/3, z+2/3'
  8  '-y+1/3, x-y+2/3, z+2/3'
  9  '-x+y+1/3, -x+2/3, z+2/3'
  10  '-y+1/3, -x+2/3, z+2/3'
  11  '-x+y+1/3, y+2/3, z+2/3'
  12  'x+1/3, x-y+2/3, z+2/3'
  13  'x+2/3, y+1/3, z+1/3'
  14  '-y+2/3, x-y+1/3, z+1/3'
  15  '-x+y+2/3, -x+1/3, z+1/3'
  16  '-y+2/3, -x+1/3, z+1/3'
  17  '-x+y+2/3, y+1/3, z+1/3'
  18  'x+2/3, x-y+1/3, z+1/3'
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
  La  La0  3  0.0  0.0  0.47  1.0
  Be  Be1  3  0.0  0.0  0.0  1.0
  Tl  Tl2  3  0.0  0.0  0.31  1.0
  Sn  Sn3  3  0.0  0.0  0.16  1.0

La Be Tl Sn
BeLaTlSn crystallizes in the trigonal R3m space group. Be(1) is bonded in a single-bond geometry to one Sn(1) atom. The Be(1)-Sn(1) bond length is 2.00 Å. La(1) is bonded to one Tl(1) and three equivalent Sn(1) atoms to form distorted LaTlSn3 trigonal pyramids that share  a cornercorner with one Sn(1)La3BeTl trigonal bipyramid and corners with six equivalent La(1)TlSn3 trigonal pyramids. The La(1)-Tl(1) bond length is 2.00 Å. All La(1)-Sn(1) bond lengths are 3.02 Å. Tl(1) is bonded in a linear geometry to one La(1) and one Sn(1) atom. The Tl(1)-Sn(1) bond length is 2.00 Å. Sn(1) is bonded to one Be(1), three equivalent La(1), and one Tl(1) atom to form distorted SnLa3BeTl trigonal bipyramids that share corners with six equivalent Sn(1)La3BeTl trigonal bipyramids and  a cornercorner with one La(1)TlSn3 trigonal pyramid.