data_RbMg2Tl
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.52
_cell_length_b   5.52
_cell_length_c   5.52
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   RbMg2Tl
_chemical_formula_sum   'Rb1 Mg2 Tl1'
_cell_volume   118.88
_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
  Rb  Rb2  1  0.0  0.0  0.0  1.0
  Mg  Mg0  1  0.95  0.95  0.95  1.0
  Mg  Mg1  1  0.85  0.85  0.85  1.0
  Tl  Tl3  1  0.9  0.9  0.9  1.0

data_RbMg2Tl
_symmetry_space_group_name_H-M   R3m
_cell_length_a   5.52
_cell_length_b   5.52
_cell_length_c   13.52
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   RbMg2Tl
_chemical_formula_sum   'Rb3 Mg6 Tl3'
_cell_volume   356.65
_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
  Rb  Rb0  3  0.0  0.0  0.0  1.0
  Mg  Mg1  3  0.0  0.0  0.05  1.0
  Mg  Mg2  3  0.0  0.0  0.15  1.0
  Tl  Tl3  3  0.0  0.0  0.1  1.0

Rb Mg Mg Tl
RbMg2Tl is Copper structured and crystallizes in the trigonal R3m space group. The structure is zero-dimensional and consists of three RbMg2Tl clusters. Rb(1) is bonded in a single-bond geometry to one Mg(1) atom. The Rb(1)-Mg(1) bond length is 0.66 Å. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a linear geometry to one Rb(1) and one Tl(1) atom. The Mg(1)-Tl(1) bond length is 0.66 Å. In the second Mg site, Mg(2) is bonded in a single-bond geometry to one Tl(1) atom. The Mg(2)-Tl(1) bond length is 0.66 Å. Tl(1) is bonded in a linear geometry to one Mg(1) and one Mg(2) atom.