The crystal structure described by MgSm6(Sb5O12)2 crystallizes in the cubic I-43m space group. Mg(1) is bonded in an octahedral geometry to six equivalent Sb(2) atoms. Sm(1) is bonded in a 8-coordinate geometry to four equivalent O(1) and four equivalent O(2) atoms. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded in a distorted trigonal non-coplanar geometry to three equivalent O(1) atoms. In the second Sb site, Sb(2) is bonded in a 5-coordinate geometry to one Mg(1), two equivalent O(1), and two equivalent O(2) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Sm(1), one Sb(1), and one Sb(2) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent Sm(1) and one Sb(2) atom. is represented by the CIF file [CIF]
data_Sm6Mg(Sb5O12)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.661
_cell_length_b   9.661
_cell_length_c   9.661
_cell_angle_alpha   109.471
_cell_angle_beta   109.471
_cell_angle_gamma   109.471
_symmetry_Int_Tables_number   1
_cell_volume   694.181
_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  Sm0  1  0.500  0.750  0.250  1.0
  Sm  Sm1  1  0.250  0.750  0.500  1.0
  Sm  Sm2  1  0.750  0.250  0.500  1.0
  Sm  Sm3  1  0.250  0.500  0.750  1.0
  Sm  Sm4  1  0.750  0.500  0.250  1.0
  Sm  Sm5  1  0.500  0.250  0.750  1.0
  Mg  Mg6  1  0.000  0.000  0.000  1.0
  Sb  Sb7  1  0.000  0.000  0.506  1.0
  Sb  Sb8  1  0.000  0.506  0.000  1.0
  Sb  Sb9  1  0.506  0.000  0.000  1.0
  Sb  Sb10  1  0.494  0.494  0.494  1.0
  Sb  Sb11  1  0.711  0.000  0.711  1.0
  Sb  Sb12  1  0.289  0.000  0.289  1.0
  Sb  Sb13  1  0.000  0.289  0.289  1.0
  Sb  Sb14  1  0.000  0.711  0.711  1.0
  Sb  Sb15  1  0.711  0.711  0.000  1.0
  Sb  Sb16  1  0.289  0.289  0.000  1.0
  O  O17  1  0.276  0.801  0.801  1.0
  O  O18  1  0.526  0.526  0.724  1.0
  O  O19  1  0.526  0.724  0.526  1.0
  O  O20  1  0.199  0.000  0.474  1.0
  O  O21  1  0.199  0.474  0.000  1.0
  O  O22  1  0.000  0.199  0.474  1.0
  O  O23  1  0.000  0.474  0.199  1.0
  O  O24  1  0.474  0.199  0.000  1.0
  O  O25  1  0.801  0.801  0.276  1.0
  O  O26  1  0.801  0.276  0.801  1.0
  O  O27  1  0.474  0.000  0.199  1.0
  O  O28  1  0.724  0.526  0.526  1.0
  O  O29  1  0.797  0.295  0.295  1.0
  O  O30  1  0.498  0.498  0.203  1.0
  O  O31  1  0.498  0.203  0.498  1.0
  O  O32  1  0.705  0.000  0.502  1.0
  O  O33  1  0.203  0.498  0.498  1.0
  O  O34  1  0.502  0.000  0.705  1.0
  O  O35  1  0.295  0.797  0.295  1.0
  O  O36  1  0.295  0.295  0.797  1.0
  O  O37  1  0.502  0.705  0.000  1.0
  O  O38  1  0.000  0.502  0.705  1.0
  O  O39  1  0.000  0.705  0.502  1.0
  O  O40  1  0.705  0.502  0.000  1.0
[/CIF]
.
The crystal structure described by MgSm6(Sb5O12)2 crystallizes in the cubic I-43m space group. Mg(1) is bonded in an octahedral geometry to six equivalent Sb(2) atoms. Sm(1) is bonded in a 8-coordinate geometry to four equivalent O(1) and four equivalent O(2) atoms. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded in a distorted trigonal non-coplanar geometry to three equivalent O(1) atoms. In the second Sb site, Sb(2) is bonded in a 5-coordinate geometry to one Mg(1), two equivalent O(1), and two equivalent O(2) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Sm(1), one Sb(1), and one Sb(2) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent Sm(1) and one Sb(2) atom. is represented by the CIF file [CIF]
data_Sm6Mg(Sb5O12)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.661
_cell_length_b   9.661
_cell_length_c   9.661
_cell_angle_alpha   109.471
_cell_angle_beta   109.471
_cell_angle_gamma   109.471
_symmetry_Int_Tables_number   1
_cell_volume   694.181
_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  Sm0  1  0.500  0.750  0.250  1.0
  Sm  Sm1  1  0.250  0.750  0.500  1.0
  Sm  Sm2  1  0.750  0.250  0.500  1.0
  Sm  Sm3  1  0.250  0.500  0.750  1.0
  Sm  Sm4  1  0.750  0.500  0.250  1.0
  Sm  Sm5  1  0.500  0.250  0.750  1.0
  Mg  Mg6  1  0.000  0.000  0.000  1.0
  Sb  Sb7  1  0.000  0.000  0.506  1.0
  Sb  Sb8  1  0.000  0.506  0.000  1.0
  Sb  Sb9  1  0.506  0.000  0.000  1.0
  Sb  Sb10  1  0.494  0.494  0.494  1.0
  Sb  Sb11  1  0.711  0.000  0.711  1.0
  Sb  Sb12  1  0.289  0.000  0.289  1.0
  Sb  Sb13  1  0.000  0.289  0.289  1.0
  Sb  Sb14  1  0.000  0.711  0.711  1.0
  Sb  Sb15  1  0.711  0.711  0.000  1.0
  Sb  Sb16  1  0.289  0.289  0.000  1.0
  O  O17  1  0.276  0.801  0.801  1.0
  O  O18  1  0.526  0.526  0.724  1.0
  O  O19  1  0.526  0.724  0.526  1.0
  O  O20  1  0.199  0.000  0.474  1.0
  O  O21  1  0.199  0.474  0.000  1.0
  O  O22  1  0.000  0.199  0.474  1.0
  O  O23  1  0.000  0.474  0.199  1.0
  O  O24  1  0.474  0.199  0.000  1.0
  O  O25  1  0.801  0.801  0.276  1.0
  O  O26  1  0.801  0.276  0.801  1.0
  O  O27  1  0.474  0.000  0.199  1.0
  O  O28  1  0.724  0.526  0.526  1.0
  O  O29  1  0.797  0.295  0.295  1.0
  O  O30  1  0.498  0.498  0.203  1.0
  O  O31  1  0.498  0.203  0.498  1.0
  O  O32  1  0.705  0.000  0.502  1.0
  O  O33  1  0.203  0.498  0.498  1.0
  O  O34  1  0.502  0.000  0.705  1.0
  O  O35  1  0.295  0.797  0.295  1.0
  O  O36  1  0.295  0.295  0.797  1.0
  O  O37  1  0.502  0.705  0.000  1.0
  O  O38  1  0.000  0.502  0.705  1.0
  O  O39  1  0.000  0.705  0.502  1.0
  O  O40  1  0.705  0.502  0.000  1.0
[/CIF]
.