The material structure described by Al4Sn13Si2(SbO14)2 crystallizes in the monoclinic C2/m space group. Al(1) is bonded to one O(1), one O(5), and two equivalent O(2) atoms to form AlO4 tetrahedra that share  a cornercorner with one Sb(1)O6 octahedra and corners with two equivalent Al(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 32°. There are five inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 3-coordinate geometry to one O(2), one O(8), and two equivalent O(1) atoms. In the second Sn site, Sn(2) is bonded in a distorted T-shaped geometry to one O(3), one O(6), and one O(7) atom. In the third Sn site, Sn(3) is bonded in a rectangular see-saw-like geometry to two equivalent O(5) and two equivalent O(8) atoms. In the fourth Sn site, Sn(4) is bonded in a distorted linear geometry to two equivalent O(4) atoms. In the fifth Sn site, Sn(5) is bonded to two equivalent O(4), two equivalent O(6), and two equivalent O(8) atoms to form distorted SnO6 octahedra that share corners with two equivalent Si(1)O4 tetrahedra,  an edgeedge with one Sn(5)O6 octahedra, and edges with two equivalent Sb(1)O6 octahedra. Si(1) is bonded to one O(3), one O(4), and two equivalent O(7) atoms to form SiO4 tetrahedra that share corners with two equivalent Sn(5)O6 octahedra. The corner-sharing octahedral tilt angles are 61°. Sb(1) is bonded to two equivalent O(5), two equivalent O(6), and two equivalent O(8) atoms to form SbO6 octahedra that share corners with two equivalent Al(1)O4 tetrahedra and edges with two equivalent Sn(5)O6 octahedra. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Al(1) and two equivalent Sn(1) atoms. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent Al(1) and one Sn(1) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to two equivalent Sn(2) and one Si(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Sn(4), two equivalent Sn(5), and one Si(1) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Al(1), one Sn(3), and one Sb(1) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Sn(2), one Sn(5), and one Sb(1) atom. In the seventh O site, O(7) is bonded in a distorted bent 120 degrees geometry to one Sn(2) and one Si(1) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Sn(1), one Sn(3), one Sn(5), and one Sb(1) atom. is represented by the CIF card [CIF]
data_Al4Si2Sn13(SbO14)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   14.661
_cell_length_b   14.661
_cell_length_c   10.093
_cell_angle_alpha   87.864
_cell_angle_beta   87.864
_cell_angle_gamma   158.372
_symmetry_Int_Tables_number   1
_cell_volume   783.600
_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
  Al  Al0  1  0.014  0.449  0.716  1.0
  Al  Al1  1  0.551  0.986  0.284  1.0
  Al  Al2  1  0.986  0.551  0.284  1.0
  Al  Al3  1  0.449  0.014  0.716  1.0
  Si  Si4  1  0.256  0.256  0.284  1.0
  Si  Si5  1  0.744  0.744  0.716  1.0
  Sn  Sn6  1  0.910  0.589  0.624  1.0
  Sn  Sn7  1  0.669  0.810  0.339  1.0
  Sn  Sn8  1  0.411  0.090  0.376  1.0
  Sn  Sn9  1  0.090  0.411  0.376  1.0
  Sn  Sn10  1  0.331  0.190  0.661  1.0
  Sn  Sn11  1  0.296  0.704  0.000  1.0
  Sn  Sn12  1  0.190  0.331  0.661  1.0
  Sn  Sn13  1  0.000  0.000  0.000  1.0
  Sn  Sn14  1  0.426  0.574  0.000  1.0
  Sn  Sn15  1  0.810  0.669  0.339  1.0
  Sn  Sn16  1  0.589  0.910  0.624  1.0
  Sn  Sn17  1  0.574  0.426  0.000  1.0
  Sn  Sn18  1  0.704  0.296  0.000  1.0
  Sb  Sb19  1  0.861  0.139  0.000  1.0
  Sb  Sb20  1  0.139  0.861  0.000  1.0
  O  O21  1  0.686  0.044  0.401  1.0
  O  O22  1  0.208  0.669  0.307  1.0
  O  O23  1  0.939  0.939  0.314  1.0
  O  O24  1  0.335  0.335  0.118  1.0
  O  O25  1  0.792  0.331  0.693  1.0
  O  O26  1  0.314  0.956  0.599  1.0
  O  O27  1  0.997  0.622  0.126  1.0
  O  O28  1  0.003  0.378  0.874  1.0
  O  O29  1  0.665  0.665  0.882  1.0
  O  O30  1  0.076  0.245  0.881  1.0
  O  O31  1  0.322  0.416  0.341  1.0
  O  O32  1  0.956  0.314  0.599  1.0
  O  O33  1  0.378  0.003  0.874  1.0
  O  O34  1  0.755  0.924  0.119  1.0
  O  O35  1  0.584  0.678  0.659  1.0
  O  O36  1  0.061  0.061  0.686  1.0
  O  O37  1  0.245  0.076  0.881  1.0
  O  O38  1  0.924  0.755  0.119  1.0
  O  O39  1  0.622  0.997  0.126  1.0
  O  O40  1  0.129  0.420  0.102  1.0
  O  O41  1  0.871  0.580  0.898  1.0
  O  O42  1  0.416  0.322  0.341  1.0
  O  O43  1  0.420  0.129  0.102  1.0
  O  O44  1  0.669  0.208  0.307  1.0
  O  O45  1  0.678  0.584  0.659  1.0
  O  O46  1  0.580  0.871  0.898  1.0
  O  O47  1  0.044  0.686  0.401  1.0
  O  O48  1  0.331  0.792  0.693  1.0
[/CIF]
.
The material structure described by Al4Sn13Si2(SbO14)2 crystallizes in the monoclinic C2/m space group. Al(1) is bonded to one O(1), one O(5), and two equivalent O(2) atoms to form AlO4 tetrahedra that share  a cornercorner with one Sb(1)O6 octahedra and corners with two equivalent Al(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 32°. There are five inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 3-coordinate geometry to one O(2), one O(8), and two equivalent O(1) atoms. In the second Sn site, Sn(2) is bonded in a distorted T-shaped geometry to one O(3), one O(6), and one O(7) atom. In the third Sn site, Sn(3) is bonded in a rectangular see-saw-like geometry to two equivalent O(5) and two equivalent O(8) atoms. In the fourth Sn site, Sn(4) is bonded in a distorted linear geometry to two equivalent O(4) atoms. In the fifth Sn site, Sn(5) is bonded to two equivalent O(4), two equivalent O(6), and two equivalent O(8) atoms to form distorted SnO6 octahedra that share corners with two equivalent Si(1)O4 tetrahedra,  an edgeedge with one Sn(5)O6 octahedra, and edges with two equivalent Sb(1)O6 octahedra. Si(1) is bonded to one O(3), one O(4), and two equivalent O(7) atoms to form SiO4 tetrahedra that share corners with two equivalent Sn(5)O6 octahedra. The corner-sharing octahedral tilt angles are 61°. Sb(1) is bonded to two equivalent O(5), two equivalent O(6), and two equivalent O(8) atoms to form SbO6 octahedra that share corners with two equivalent Al(1)O4 tetrahedra and edges with two equivalent Sn(5)O6 octahedra. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Al(1) and two equivalent Sn(1) atoms. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent Al(1) and one Sn(1) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to two equivalent Sn(2) and one Si(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Sn(4), two equivalent Sn(5), and one Si(1) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Al(1), one Sn(3), and one Sb(1) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Sn(2), one Sn(5), and one Sb(1) atom. In the seventh O site, O(7) is bonded in a distorted bent 120 degrees geometry to one Sn(2) and one Si(1) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Sn(1), one Sn(3), one Sn(5), and one Sb(1) atom. is represented by the CIF card [CIF]
data_Al4Si2Sn13(SbO14)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   14.661
_cell_length_b   14.661
_cell_length_c   10.093
_cell_angle_alpha   87.864
_cell_angle_beta   87.864
_cell_angle_gamma   158.372
_symmetry_Int_Tables_number   1
_cell_volume   783.600
_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
  Al  Al0  1  0.014  0.449  0.716  1.0
  Al  Al1  1  0.551  0.986  0.284  1.0
  Al  Al2  1  0.986  0.551  0.284  1.0
  Al  Al3  1  0.449  0.014  0.716  1.0
  Si  Si4  1  0.256  0.256  0.284  1.0
  Si  Si5  1  0.744  0.744  0.716  1.0
  Sn  Sn6  1  0.910  0.589  0.624  1.0
  Sn  Sn7  1  0.669  0.810  0.339  1.0
  Sn  Sn8  1  0.411  0.090  0.376  1.0
  Sn  Sn9  1  0.090  0.411  0.376  1.0
  Sn  Sn10  1  0.331  0.190  0.661  1.0
  Sn  Sn11  1  0.296  0.704  0.000  1.0
  Sn  Sn12  1  0.190  0.331  0.661  1.0
  Sn  Sn13  1  0.000  0.000  0.000  1.0
  Sn  Sn14  1  0.426  0.574  0.000  1.0
  Sn  Sn15  1  0.810  0.669  0.339  1.0
  Sn  Sn16  1  0.589  0.910  0.624  1.0
  Sn  Sn17  1  0.574  0.426  0.000  1.0
  Sn  Sn18  1  0.704  0.296  0.000  1.0
  Sb  Sb19  1  0.861  0.139  0.000  1.0
  Sb  Sb20  1  0.139  0.861  0.000  1.0
  O  O21  1  0.686  0.044  0.401  1.0
  O  O22  1  0.208  0.669  0.307  1.0
  O  O23  1  0.939  0.939  0.314  1.0
  O  O24  1  0.335  0.335  0.118  1.0
  O  O25  1  0.792  0.331  0.693  1.0
  O  O26  1  0.314  0.956  0.599  1.0
  O  O27  1  0.997  0.622  0.126  1.0
  O  O28  1  0.003  0.378  0.874  1.0
  O  O29  1  0.665  0.665  0.882  1.0
  O  O30  1  0.076  0.245  0.881  1.0
  O  O31  1  0.322  0.416  0.341  1.0
  O  O32  1  0.956  0.314  0.599  1.0
  O  O33  1  0.378  0.003  0.874  1.0
  O  O34  1  0.755  0.924  0.119  1.0
  O  O35  1  0.584  0.678  0.659  1.0
  O  O36  1  0.061  0.061  0.686  1.0
  O  O37  1  0.245  0.076  0.881  1.0
  O  O38  1  0.924  0.755  0.119  1.0
  O  O39  1  0.622  0.997  0.126  1.0
  O  O40  1  0.129  0.420  0.102  1.0
  O  O41  1  0.871  0.580  0.898  1.0
  O  O42  1  0.416  0.322  0.341  1.0
  O  O43  1  0.420  0.129  0.102  1.0
  O  O44  1  0.669  0.208  0.307  1.0
  O  O45  1  0.678  0.584  0.659  1.0
  O  O46  1  0.580  0.871  0.898  1.0
  O  O47  1  0.044  0.686  0.401  1.0
  O  O48  1  0.331  0.792  0.693  1.0
[/CIF]
.