data_Sm3Mg
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.96
_cell_length_b   4.96
_cell_length_c   4.96
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Sm3Mg
_chemical_formula_sum   'Sm3 Mg1'
_cell_volume   122.3
_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
  Sm  Sm1  1  0.48  0.48  0.0  1.0
  Sm  Sm2  1  0.48  0.0  0.48  1.0
  Sm  Sm3  1  0.0  0.48  0.48  1.0
  Mg  Mg0  1  0.0  0.0  0.0  1.0

data_Sm3Mg
_symmetry_space_group_name_H-M   R3m
_cell_length_a   7.02
_cell_length_b   7.02
_cell_length_c   8.6
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   Sm3Mg
_chemical_formula_sum   'Sm9 Mg3'
_cell_volume   366.9
_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
  Sm  Sm0  9  0.01  0.51  0.99  1.0
  Mg  Mg1  3  0.0  0.0  0.0  1.0

Sm Sm Sm Mg
MgSm3 is Uranium Silicide structured and crystallizes in the trigonal R3m space group. Mg(1) is bonded to twelve equivalent Sm(1) atoms to form MgSm12 cuboctahedra that share corners with twelve equivalent Mg(1)Sm12 cuboctahedra, edges with twenty-four equivalent Sm(1)Sm8Mg4 cuboctahedra, faces with six equivalent Mg(1)Sm12 cuboctahedra, and faces with twelve equivalent Sm(1)Sm8Mg4 cuboctahedra. There are a spread of Mg(1)-Sm(1) bond distances ranging from 3.38-3.64 Å. Sm(1) is bonded to four equivalent Mg(1) and eight equivalent Sm(1) atoms to form distorted SmSm8Mg4 cuboctahedra that share corners with twelve equivalent Sm(1)Sm8Mg4 cuboctahedra, edges with eight equivalent Mg(1)Sm12 cuboctahedra, edges with sixteen equivalent Sm(1)Sm8Mg4 cuboctahedra, faces with four equivalent Mg(1)Sm12 cuboctahedra, and faces with fourteen equivalent Sm(1)Sm8Mg4 cuboctahedra. There are a spread of Sm(1)-Sm(1) bond distances ranging from 3.38-3.64 Å.