The structure described by Na3NbZnSi2SO12 crystallizes in the monoclinic Cc space group. There are three inequivalent Na sites. In the first Na site, Na(1) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(11), one O(3), one O(7), one O(9), and two equivalent O(5) atoms. In the second Na site, Na(2) is bonded in a 6-coordinate geometry to one O(10), one O(12), one O(2), one O(4), one O(7), and one O(8) atom. In the third Na site, Na(3) is bonded in a 6-coordinate geometry to one O(10), one O(11), one O(12), one O(7), one O(8), and one O(9) atom. Nb(1) is bonded to one O(10), one O(11), one O(12), one O(4), one O(5), and one O(6) atom to form NbO6 octahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and corners with two equivalent S(1)O4 tetrahedra. Zn(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(7), one O(8), and one O(9) atom. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(11), one O(2), one O(5), and one O(8) atom to form SiO4 tetrahedra that share corners with two equivalent Nb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 22-37°. In the second Si site, Si(2) is bonded to one O(12), one O(3), one O(4), and one O(7) atom to form SiO4 tetrahedra that share corners with two equivalent Nb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 27-35°. S(1) is bonded to one O(1), one O(10), one O(6), and one O(9) atom to form SO4 tetrahedra that share corners with two equivalent Nb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 23-40°. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Na(1), one Zn(1), and one S(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Na(2), one Zn(1), and one Si(1) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Na(1), one Zn(1), and one Si(2) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Na(2), one Nb(1), and one Si(2) atom. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to two equivalent Na(1), one Nb(1), and one Si(1) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Nb(1) and one S(1) atom. In the seventh O site, O(7) is bonded to one Na(1), one Na(2), one Na(3), one Zn(1), and one Si(2) atom to form distorted ONa3ZnSi trigonal bipyramids that share corners with two equivalent O(11)Na2NbSi trigonal pyramids and  a faceface with one O(8)Na2ZnSi trigonal pyramid. In the eighth O site, O(8) is bonded to one Na(2), one Na(3), one Zn(1), and one Si(1) atom to form distorted ONa2ZnSi trigonal pyramids that share corners with two equivalent O(11)Na2NbSi trigonal pyramids and  a faceface with one O(7)Na3ZnSi trigonal bipyramid. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Na(1), one Na(3), one Zn(1), and one S(1) atom. In the tenth O site, O(10) is bonded in a 5-coordinate geometry to one Na(1), one Na(2), one Na(3), one Nb(1), and one S(1) atom. In the eleventh O site, O(11) is bonded to one Na(1), one Na(3), one Nb(1), and one Si(1) atom to form distorted ONa2NbSi trigonal pyramids that share corners with two equivalent O(7)Na3ZnSi trigonal bipyramids and corners with two equivalent O(8)Na2ZnSi trigonal pyramids. In the twelfth O site, O(12) is bonded in a distorted rectangular see-saw-like geometry to one Na(2), one Na(3), one Nb(1), and one Si(2) atom. is represented by the CIF card [CIF]
data_Na3NbZnSi2SO12
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.088
_cell_length_b   9.088
_cell_length_c   9.126
_cell_angle_alpha   91.311
_cell_angle_beta   118.895
_cell_angle_gamma   119.456
_symmetry_Int_Tables_number   1
_cell_volume   539.980
_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  0.481  0.091  0.245  1.0
  Na  Na1  1  0.894  0.779  0.264  1.0
  Na  Na2  1  0.154  0.264  0.745  1.0
  Na  Na3  1  0.484  0.870  0.764  1.0
  Na  Na4  1  0.034  0.519  0.525  1.0
  Na  Na5  1  0.006  0.991  0.025  1.0
  Nb  Nb6  1  0.708  0.359  0.061  1.0
  Nb  Nb7  1  0.702  0.853  0.561  1.0
  O  O8  1  0.369  0.474  0.080  1.0
  O  O9  1  0.598  0.873  0.066  1.0
  O  O10  1  0.212  0.712  0.080  1.0
  O  O11  1  0.193  0.968  0.566  1.0
  O  O12  1  0.607  0.211  0.580  1.0
  O  O13  1  0.368  0.368  0.580  1.0
  O  O14  1  0.646  0.508  0.930  1.0
  O  O15  1  0.419  0.143  0.919  1.0
  O  O16  1  0.779  0.277  0.903  1.0
  O  O17  1  0.777  0.000  0.419  1.0
  O  O18  1  0.422  0.784  0.430  1.0
  O  O19  1  0.626  0.624  0.403  1.0
  O  O20  1  0.342  0.565  0.767  1.0
  O  O21  1  0.184  0.770  0.760  1.0
  O  O22  1  0.978  0.389  0.770  1.0
  O  O23  1  0.990  0.076  0.260  1.0
  O  O24  1  0.202  0.925  0.267  1.0
  O  O25  1  0.381  0.292  0.270  1.0
  O  O26  1  0.664  0.455  0.242  1.0
  O  O27  1  0.781  0.225  0.229  1.0
  O  O28  1  1.000  0.572  0.230  1.0
  O  O29  1  0.004  0.949  0.729  1.0
  O  O30  1  0.787  0.078  0.742  1.0
  O  O31  1  0.658  0.730  0.730  1.0
  S  S32  1  0.496  0.456  0.243  1.0
  S  S33  1  0.787  0.247  0.743  1.0
  Si  Si34  1  0.792  0.045  0.242  1.0
  Si  Si35  1  0.205  0.749  0.246  1.0
  Si  Si36  1  0.196  0.949  0.742  1.0
  Si  Si37  1  0.497  0.541  0.746  1.0
  Zn  Zn38  1  0.309  0.678  0.947  1.0
  Zn  Zn39  1  0.269  0.139  0.447  1.0
[/CIF]
.
The structure described by Na3NbZnSi2SO12 crystallizes in the monoclinic Cc space group. There are three inequivalent Na sites. In the first Na site, Na(1) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(11), one O(3), one O(7), one O(9), and two equivalent O(5) atoms. In the second Na site, Na(2) is bonded in a 6-coordinate geometry to one O(10), one O(12), one O(2), one O(4), one O(7), and one O(8) atom. In the third Na site, Na(3) is bonded in a 6-coordinate geometry to one O(10), one O(11), one O(12), one O(7), one O(8), and one O(9) atom. Nb(1) is bonded to one O(10), one O(11), one O(12), one O(4), one O(5), and one O(6) atom to form NbO6 octahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and corners with two equivalent S(1)O4 tetrahedra. Zn(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(7), one O(8), and one O(9) atom. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(11), one O(2), one O(5), and one O(8) atom to form SiO4 tetrahedra that share corners with two equivalent Nb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 22-37°. In the second Si site, Si(2) is bonded to one O(12), one O(3), one O(4), and one O(7) atom to form SiO4 tetrahedra that share corners with two equivalent Nb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 27-35°. S(1) is bonded to one O(1), one O(10), one O(6), and one O(9) atom to form SO4 tetrahedra that share corners with two equivalent Nb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 23-40°. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Na(1), one Zn(1), and one S(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Na(2), one Zn(1), and one Si(1) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Na(1), one Zn(1), and one Si(2) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Na(2), one Nb(1), and one Si(2) atom. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to two equivalent Na(1), one Nb(1), and one Si(1) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Nb(1) and one S(1) atom. In the seventh O site, O(7) is bonded to one Na(1), one Na(2), one Na(3), one Zn(1), and one Si(2) atom to form distorted ONa3ZnSi trigonal bipyramids that share corners with two equivalent O(11)Na2NbSi trigonal pyramids and  a faceface with one O(8)Na2ZnSi trigonal pyramid. In the eighth O site, O(8) is bonded to one Na(2), one Na(3), one Zn(1), and one Si(1) atom to form distorted ONa2ZnSi trigonal pyramids that share corners with two equivalent O(11)Na2NbSi trigonal pyramids and  a faceface with one O(7)Na3ZnSi trigonal bipyramid. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Na(1), one Na(3), one Zn(1), and one S(1) atom. In the tenth O site, O(10) is bonded in a 5-coordinate geometry to one Na(1), one Na(2), one Na(3), one Nb(1), and one S(1) atom. In the eleventh O site, O(11) is bonded to one Na(1), one Na(3), one Nb(1), and one Si(1) atom to form distorted ONa2NbSi trigonal pyramids that share corners with two equivalent O(7)Na3ZnSi trigonal bipyramids and corners with two equivalent O(8)Na2ZnSi trigonal pyramids. In the twelfth O site, O(12) is bonded in a distorted rectangular see-saw-like geometry to one Na(2), one Na(3), one Nb(1), and one Si(2) atom. is represented by the CIF card [CIF]
data_Na3NbZnSi2SO12
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.088
_cell_length_b   9.088
_cell_length_c   9.126
_cell_angle_alpha   91.311
_cell_angle_beta   118.895
_cell_angle_gamma   119.456
_symmetry_Int_Tables_number   1
_cell_volume   539.980
_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  0.481  0.091  0.245  1.0
  Na  Na1  1  0.894  0.779  0.264  1.0
  Na  Na2  1  0.154  0.264  0.745  1.0
  Na  Na3  1  0.484  0.870  0.764  1.0
  Na  Na4  1  0.034  0.519  0.525  1.0
  Na  Na5  1  0.006  0.991  0.025  1.0
  Nb  Nb6  1  0.708  0.359  0.061  1.0
  Nb  Nb7  1  0.702  0.853  0.561  1.0
  O  O8  1  0.369  0.474  0.080  1.0
  O  O9  1  0.598  0.873  0.066  1.0
  O  O10  1  0.212  0.712  0.080  1.0
  O  O11  1  0.193  0.968  0.566  1.0
  O  O12  1  0.607  0.211  0.580  1.0
  O  O13  1  0.368  0.368  0.580  1.0
  O  O14  1  0.646  0.508  0.930  1.0
  O  O15  1  0.419  0.143  0.919  1.0
  O  O16  1  0.779  0.277  0.903  1.0
  O  O17  1  0.777  0.000  0.419  1.0
  O  O18  1  0.422  0.784  0.430  1.0
  O  O19  1  0.626  0.624  0.403  1.0
  O  O20  1  0.342  0.565  0.767  1.0
  O  O21  1  0.184  0.770  0.760  1.0
  O  O22  1  0.978  0.389  0.770  1.0
  O  O23  1  0.990  0.076  0.260  1.0
  O  O24  1  0.202  0.925  0.267  1.0
  O  O25  1  0.381  0.292  0.270  1.0
  O  O26  1  0.664  0.455  0.242  1.0
  O  O27  1  0.781  0.225  0.229  1.0
  O  O28  1  1.000  0.572  0.230  1.0
  O  O29  1  0.004  0.949  0.729  1.0
  O  O30  1  0.787  0.078  0.742  1.0
  O  O31  1  0.658  0.730  0.730  1.0
  S  S32  1  0.496  0.456  0.243  1.0
  S  S33  1  0.787  0.247  0.743  1.0
  Si  Si34  1  0.792  0.045  0.242  1.0
  Si  Si35  1  0.205  0.749  0.246  1.0
  Si  Si36  1  0.196  0.949  0.742  1.0
  Si  Si37  1  0.497  0.541  0.746  1.0
  Zn  Zn38  1  0.309  0.678  0.947  1.0
  Zn  Zn39  1  0.269  0.139  0.447  1.0
[/CIF]
.