The material structure described by Na2SnSi3O11 crystallizes in the orthorhombic C222_1 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(6) atoms to form distorted NaO6 octahedra that share corners with two equivalent Na(2)O5 square pyramids, corners with two equivalent Si(1)O4 tetrahedra, edges with two equivalent Sn(1)O6 octahedra, and  an edgeedge with one Si(2)O4 tetrahedra. In the second Na site, Na(2) is bonded to one O(5), two equivalent O(1), and two equivalent O(6) atoms to form distorted NaO5 square pyramids that share corners with two equivalent Na(1)O6 octahedra, corners with two equivalent Sn(1)O6 octahedra, and corners with four equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 52-68°. Sn(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form SnO6 octahedra that share corners with two equivalent Na(2)O5 square pyramids, corners with two equivalent Si(2)O4 tetrahedra, corners with four equivalent Si(1)O4 tetrahedra, and edges with two equivalent Na(1)O6 octahedra. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(3), one O(4), and one O(5) atom to form SiO4 tetrahedra that share  a cornercorner with one Na(1)O6 octahedra, corners with two equivalent Sn(1)O6 octahedra, corners with two equivalent Na(2)O5 square pyramids,  a cornercorner with one Si(1)O4 tetrahedra, and  a cornercorner with one Si(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 49-59°. In the second Si site, Si(2) is bonded to two equivalent O(2) and two equivalent O(4) atoms to form SiO4 tetrahedra that share corners with two equivalent Sn(1)O6 octahedra, corners with two equivalent Si(1)O4 tetrahedra, and  an edgeedge with one Na(1)O6 octahedra. The corner-sharing octahedral tilt angles are 50°. There are six inequivalent O sites. In the first O site, O(3) is bonded in a 3-coordinate geometry to one Na(1), one Sn(1), and one Si(1) atom. In the second O site, O(4) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(2) atom. In the third O site, O(5) is bonded in a distorted trigonal planar geometry to one Na(2) and two equivalent Si(1) atoms. In the fourth O site, O(6) is bonded in a bent 120 degrees geometry to one Na(1) and one Na(2) atom. In the fifth O site, O(1) is bonded in a distorted trigonal planar geometry to one Na(2), one Sn(1), and one Si(1) atom. In the sixth O site, O(2) is bonded in a 3-coordinate geometry to one Na(1), one Sn(1), and one Si(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na2Si3SnO11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.530
_cell_length_b   6.530
_cell_length_c   11.795
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   104.769
_symmetry_Int_Tables_number   1
_cell_volume   486.312
_cell_formula_units_Z   2
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
  Na  Na0  1  0.282  0.282  0.000  1.0
  Na  Na1  1  0.718  0.718  0.500  1.0
  Na  Na2  1  0.187  0.813  0.750  1.0
  Na  Na3  1  0.813  0.187  0.250  1.0
  Si  Si4  1  0.698  0.934  0.785  1.0
  Si  Si5  1  0.934  0.698  0.215  1.0
  Si  Si6  1  0.302  0.066  0.285  1.0
  Si  Si7  1  0.066  0.302  0.715  1.0
  Si  Si8  1  0.666  0.666  0.000  1.0
  Si  Si9  1  0.334  0.334  0.500  1.0
  Sn  Sn10  1  0.595  0.405  0.750  1.0
  Sn  Sn11  1  0.405  0.595  0.250  1.0
  O  O12  1  0.535  0.081  0.766  1.0
  O  O13  1  0.081  0.535  0.234  1.0
  O  O14  1  0.465  0.919  0.266  1.0
  O  O15  1  0.919  0.465  0.734  1.0
  O  O16  1  0.550  0.361  0.575  1.0
  O  O17  1  0.361  0.550  0.425  1.0
  O  O18  1  0.450  0.639  0.075  1.0
  O  O19  1  0.639  0.450  0.925  1.0
  O  O20  1  0.626  0.720  0.709  1.0
  O  O21  1  0.720  0.626  0.291  1.0
  O  O22  1  0.374  0.280  0.209  1.0
  O  O23  1  0.280  0.374  0.791  1.0
  O  O24  1  0.705  0.878  0.920  1.0
  O  O25  1  0.878  0.705  0.080  1.0
  O  O26  1  0.295  0.122  0.420  1.0
  O  O27  1  0.122  0.295  0.580  1.0
  O  O28  1  0.945  0.055  0.750  1.0
  O  O29  1  0.055  0.945  0.250  1.0
  O  O30  1  0.232  0.893  0.959  1.0
  O  O31  1  0.893  0.232  0.041  1.0
  O  O32  1  0.768  0.107  0.459  1.0
  O  O33  1  0.107  0.768  0.541  1.0
[/CIF]
.
The material structure described by Na2SnSi3O11 crystallizes in the orthorhombic C222_1 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(6) atoms to form distorted NaO6 octahedra that share corners with two equivalent Na(2)O5 square pyramids, corners with two equivalent Si(1)O4 tetrahedra, edges with two equivalent Sn(1)O6 octahedra, and  an edgeedge with one Si(2)O4 tetrahedra. In the second Na site, Na(2) is bonded to one O(5), two equivalent O(1), and two equivalent O(6) atoms to form distorted NaO5 square pyramids that share corners with two equivalent Na(1)O6 octahedra, corners with two equivalent Sn(1)O6 octahedra, and corners with four equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 52-68°. Sn(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form SnO6 octahedra that share corners with two equivalent Na(2)O5 square pyramids, corners with two equivalent Si(2)O4 tetrahedra, corners with four equivalent Si(1)O4 tetrahedra, and edges with two equivalent Na(1)O6 octahedra. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(3), one O(4), and one O(5) atom to form SiO4 tetrahedra that share  a cornercorner with one Na(1)O6 octahedra, corners with two equivalent Sn(1)O6 octahedra, corners with two equivalent Na(2)O5 square pyramids,  a cornercorner with one Si(1)O4 tetrahedra, and  a cornercorner with one Si(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 49-59°. In the second Si site, Si(2) is bonded to two equivalent O(2) and two equivalent O(4) atoms to form SiO4 tetrahedra that share corners with two equivalent Sn(1)O6 octahedra, corners with two equivalent Si(1)O4 tetrahedra, and  an edgeedge with one Na(1)O6 octahedra. The corner-sharing octahedral tilt angles are 50°. There are six inequivalent O sites. In the first O site, O(3) is bonded in a 3-coordinate geometry to one Na(1), one Sn(1), and one Si(1) atom. In the second O site, O(4) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(2) atom. In the third O site, O(5) is bonded in a distorted trigonal planar geometry to one Na(2) and two equivalent Si(1) atoms. In the fourth O site, O(6) is bonded in a bent 120 degrees geometry to one Na(1) and one Na(2) atom. In the fifth O site, O(1) is bonded in a distorted trigonal planar geometry to one Na(2), one Sn(1), and one Si(1) atom. In the sixth O site, O(2) is bonded in a 3-coordinate geometry to one Na(1), one Sn(1), and one Si(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na2Si3SnO11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.530
_cell_length_b   6.530
_cell_length_c   11.795
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   104.769
_symmetry_Int_Tables_number   1
_cell_volume   486.312
_cell_formula_units_Z   2
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
  Na  Na0  1  0.282  0.282  0.000  1.0
  Na  Na1  1  0.718  0.718  0.500  1.0
  Na  Na2  1  0.187  0.813  0.750  1.0
  Na  Na3  1  0.813  0.187  0.250  1.0
  Si  Si4  1  0.698  0.934  0.785  1.0
  Si  Si5  1  0.934  0.698  0.215  1.0
  Si  Si6  1  0.302  0.066  0.285  1.0
  Si  Si7  1  0.066  0.302  0.715  1.0
  Si  Si8  1  0.666  0.666  0.000  1.0
  Si  Si9  1  0.334  0.334  0.500  1.0
  Sn  Sn10  1  0.595  0.405  0.750  1.0
  Sn  Sn11  1  0.405  0.595  0.250  1.0
  O  O12  1  0.535  0.081  0.766  1.0
  O  O13  1  0.081  0.535  0.234  1.0
  O  O14  1  0.465  0.919  0.266  1.0
  O  O15  1  0.919  0.465  0.734  1.0
  O  O16  1  0.550  0.361  0.575  1.0
  O  O17  1  0.361  0.550  0.425  1.0
  O  O18  1  0.450  0.639  0.075  1.0
  O  O19  1  0.639  0.450  0.925  1.0
  O  O20  1  0.626  0.720  0.709  1.0
  O  O21  1  0.720  0.626  0.291  1.0
  O  O22  1  0.374  0.280  0.209  1.0
  O  O23  1  0.280  0.374  0.791  1.0
  O  O24  1  0.705  0.878  0.920  1.0
  O  O25  1  0.878  0.705  0.080  1.0
  O  O26  1  0.295  0.122  0.420  1.0
  O  O27  1  0.122  0.295  0.580  1.0
  O  O28  1  0.945  0.055  0.750  1.0
  O  O29  1  0.055  0.945  0.250  1.0
  O  O30  1  0.232  0.893  0.959  1.0
  O  O31  1  0.893  0.232  0.041  1.0
  O  O32  1  0.768  0.107  0.459  1.0
  O  O33  1  0.107  0.768  0.541  1.0
[/CIF]
.