The structure described by Na2W3SeO14 crystallizes in the monoclinic Cc space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(10), one O(11), one O(12), one O(13), one O(4), one O(7), and one O(8) atom to form NaO7 pentagonal bipyramids that share  a cornercorner with one W(1)O6 octahedra,  a cornercorner with one W(2)O6 octahedra,  an edgeedge with one W(1)O6 octahedra,  an edgeedge with one W(2)O6 octahedra, and edges with two equivalent Na(2)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles range from 45-48°. In the second Na site, Na(2) is bonded to one O(10), one O(11), one O(13), one O(14), one O(6), one O(7), and one O(9) atom to form NaO7 pentagonal bipyramids that share  a cornercorner with one W(2)O6 octahedra,  a cornercorner with one W(3)O6 octahedra,  an edgeedge with one W(1)O6 octahedra,  an edgeedge with one W(3)O6 octahedra, and edges with two equivalent Na(1)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles range from 46-50°. There are three inequivalent W sites. In the first W site, W(1) is bonded to one O(1), one O(10), one O(12), one O(2), one O(4), and one O(6) atom to form distorted WO6 octahedra that share corners with two equivalent W(2)O6 octahedra, corners with two equivalent W(3)O6 octahedra,  a cornercorner with one Na(1)O7 pentagonal bipyramid,  an edgeedge with one Na(1)O7 pentagonal bipyramid, and  an edgeedge with one Na(2)O7 pentagonal bipyramid. The corner-sharing octahedral tilt angles range from 29-46°. In the second W site, W(2) is bonded to one O(13), one O(2), one O(3), one O(4), one O(5), and one O(8) atom to form WO6 octahedra that share corners with two equivalent W(1)O6 octahedra, corners with two equivalent W(3)O6 octahedra,  a cornercorner with one Na(1)O7 pentagonal bipyramid,  a cornercorner with one Na(2)O7 pentagonal bipyramid, and  an edgeedge with one Na(1)O7 pentagonal bipyramid. The corner-sharing octahedral tilt angles range from 29-46°. In the third W site, W(3) is bonded to one O(1), one O(14), one O(3), one O(5), one O(6), and one O(9) atom to form distorted WO6 octahedra that share corners with two equivalent W(1)O6 octahedra, corners with two equivalent W(2)O6 octahedra,  a cornercorner with one Na(2)O7 pentagonal bipyramid, and  an edgeedge with one Na(2)O7 pentagonal bipyramid. The corner-sharing octahedral tilt angles range from 29-44°. Se(1) is bonded in a trigonal non-coplanar geometry to one O(10), one O(8), and one O(9) atom. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one W(1) and one W(3) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one W(1) and one W(2) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one W(2) and one W(3) atom. In the fourth O site, O(4) is bonded in a distorted trigonal non-coplanar geometry to one Na(1), one W(1), and one W(2) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one W(2) and one W(3) atom. In the sixth O site, O(6) is bonded in a distorted trigonal non-coplanar geometry to one Na(2), one W(1), and one W(3) atom. In the seventh O site, O(7) is bonded in a water-like geometry to one Na(1) and one Na(2) atom. In the eighth O site, O(8) is bonded in a distorted trigonal non-coplanar geometry to one Na(1), one W(2), and one Se(1) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Na(2), one W(3), and one Se(1) atom. In the tenth O site, O(10) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), one Na(2), one W(1), and one Se(1) atom. In the eleventh O site, O(11) is bonded in an L-shaped geometry to one Na(1) and one Na(2) atom. In the twelfth O site, O(12) is bonded in a distorted bent 150 degrees geometry to one Na(1) and one W(1) atom. In the thirteenth O site, O(13) is bonded in a distorted trigonal planar geometry to one Na(1), one Na(2), and one W(2) atom. In the fourteenth O site, O(14) is bonded in a distorted bent 120 degrees geometry to one Na(2) and one W(3) atom. is represented by the CIF card [CIF]
data_Na2W3SeO14
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.353
_cell_length_b   7.398
_cell_length_c   12.510
_cell_angle_alpha   89.780
_cell_angle_beta   90.442
_cell_angle_gamma   119.799
_symmetry_Int_Tables_number   1
_cell_volume   590.559
_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  0.494  0.004  0.245  1.0
  Na  Na1  1  0.505  0.501  0.246  1.0
  Na  Na2  1  0.490  0.996  0.745  1.0
  Na  Na3  1  0.004  0.499  0.746  1.0
  W  W4  1  0.824  0.164  0.503  1.0
  W  W5  1  0.337  0.174  0.505  1.0
  W  W6  1  0.834  0.662  0.503  1.0
  W  W7  1  0.660  0.836  0.003  1.0
  W  W8  1  0.163  0.826  0.005  1.0
  W  W9  1  0.172  0.338  0.003  1.0
  Se  Se10  1  0.004  0.997  0.731  1.0
  Se  Se11  1  0.008  0.003  0.231  1.0
  O  O12  1  0.753  0.876  0.495  1.0
  O  O13  1  0.118  0.243  0.494  1.0
  O  O14  1  0.124  0.878  0.493  1.0
  O  O15  1  0.878  0.124  0.995  1.0
  O  O16  1  0.875  0.757  0.994  1.0
  O  O17  1  0.246  0.122  0.993  1.0
  O  O18  1  0.543  0.092  0.550  1.0
  O  O19  1  0.543  0.457  0.544  1.0
  O  O20  1  0.909  0.453  0.546  1.0
  O  O21  1  0.451  0.908  0.050  1.0
  O  O22  1  0.086  0.543  0.044  1.0
  O  O23  1  0.457  0.547  0.046  1.0
  O  O24  1  0.333  0.667  0.342  1.0
  O  O25  1  0.665  0.333  0.842  1.0
  O  O26  1  0.251  0.119  0.672  1.0
  O  O27  1  0.889  0.751  0.673  1.0
  O  O28  1  0.874  0.120  0.675  1.0
  O  O29  1  0.132  0.881  0.172  1.0
  O  O30  1  0.138  0.249  0.173  1.0
  O  O31  1  0.754  0.880  0.175  1.0
  O  O32  1  0.697  0.350  0.155  1.0
  O  O33  1  0.348  0.650  0.655  1.0
  O  O34  1  0.780  0.186  0.366  1.0
  O  O35  1  0.394  0.199  0.365  1.0
  O  O36  1  0.795  0.604  0.365  1.0
  O  O37  1  0.593  0.814  0.866  1.0
  O  O38  1  0.195  0.801  0.865  1.0
  O  O39  1  0.191  0.396  0.865  1.0
[/CIF]
.
The structure described by Na2W3SeO14 crystallizes in the monoclinic Cc space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(10), one O(11), one O(12), one O(13), one O(4), one O(7), and one O(8) atom to form NaO7 pentagonal bipyramids that share  a cornercorner with one W(1)O6 octahedra,  a cornercorner with one W(2)O6 octahedra,  an edgeedge with one W(1)O6 octahedra,  an edgeedge with one W(2)O6 octahedra, and edges with two equivalent Na(2)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles range from 45-48°. In the second Na site, Na(2) is bonded to one O(10), one O(11), one O(13), one O(14), one O(6), one O(7), and one O(9) atom to form NaO7 pentagonal bipyramids that share  a cornercorner with one W(2)O6 octahedra,  a cornercorner with one W(3)O6 octahedra,  an edgeedge with one W(1)O6 octahedra,  an edgeedge with one W(3)O6 octahedra, and edges with two equivalent Na(1)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles range from 46-50°. There are three inequivalent W sites. In the first W site, W(1) is bonded to one O(1), one O(10), one O(12), one O(2), one O(4), and one O(6) atom to form distorted WO6 octahedra that share corners with two equivalent W(2)O6 octahedra, corners with two equivalent W(3)O6 octahedra,  a cornercorner with one Na(1)O7 pentagonal bipyramid,  an edgeedge with one Na(1)O7 pentagonal bipyramid, and  an edgeedge with one Na(2)O7 pentagonal bipyramid. The corner-sharing octahedral tilt angles range from 29-46°. In the second W site, W(2) is bonded to one O(13), one O(2), one O(3), one O(4), one O(5), and one O(8) atom to form WO6 octahedra that share corners with two equivalent W(1)O6 octahedra, corners with two equivalent W(3)O6 octahedra,  a cornercorner with one Na(1)O7 pentagonal bipyramid,  a cornercorner with one Na(2)O7 pentagonal bipyramid, and  an edgeedge with one Na(1)O7 pentagonal bipyramid. The corner-sharing octahedral tilt angles range from 29-46°. In the third W site, W(3) is bonded to one O(1), one O(14), one O(3), one O(5), one O(6), and one O(9) atom to form distorted WO6 octahedra that share corners with two equivalent W(1)O6 octahedra, corners with two equivalent W(2)O6 octahedra,  a cornercorner with one Na(2)O7 pentagonal bipyramid, and  an edgeedge with one Na(2)O7 pentagonal bipyramid. The corner-sharing octahedral tilt angles range from 29-44°. Se(1) is bonded in a trigonal non-coplanar geometry to one O(10), one O(8), and one O(9) atom. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one W(1) and one W(3) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one W(1) and one W(2) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one W(2) and one W(3) atom. In the fourth O site, O(4) is bonded in a distorted trigonal non-coplanar geometry to one Na(1), one W(1), and one W(2) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one W(2) and one W(3) atom. In the sixth O site, O(6) is bonded in a distorted trigonal non-coplanar geometry to one Na(2), one W(1), and one W(3) atom. In the seventh O site, O(7) is bonded in a water-like geometry to one Na(1) and one Na(2) atom. In the eighth O site, O(8) is bonded in a distorted trigonal non-coplanar geometry to one Na(1), one W(2), and one Se(1) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Na(2), one W(3), and one Se(1) atom. In the tenth O site, O(10) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), one Na(2), one W(1), and one Se(1) atom. In the eleventh O site, O(11) is bonded in an L-shaped geometry to one Na(1) and one Na(2) atom. In the twelfth O site, O(12) is bonded in a distorted bent 150 degrees geometry to one Na(1) and one W(1) atom. In the thirteenth O site, O(13) is bonded in a distorted trigonal planar geometry to one Na(1), one Na(2), and one W(2) atom. In the fourteenth O site, O(14) is bonded in a distorted bent 120 degrees geometry to one Na(2) and one W(3) atom. is represented by the CIF card [CIF]
data_Na2W3SeO14
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.353
_cell_length_b   7.398
_cell_length_c   12.510
_cell_angle_alpha   89.780
_cell_angle_beta   90.442
_cell_angle_gamma   119.799
_symmetry_Int_Tables_number   1
_cell_volume   590.559
_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  0.494  0.004  0.245  1.0
  Na  Na1  1  0.505  0.501  0.246  1.0
  Na  Na2  1  0.490  0.996  0.745  1.0
  Na  Na3  1  0.004  0.499  0.746  1.0
  W  W4  1  0.824  0.164  0.503  1.0
  W  W5  1  0.337  0.174  0.505  1.0
  W  W6  1  0.834  0.662  0.503  1.0
  W  W7  1  0.660  0.836  0.003  1.0
  W  W8  1  0.163  0.826  0.005  1.0
  W  W9  1  0.172  0.338  0.003  1.0
  Se  Se10  1  0.004  0.997  0.731  1.0
  Se  Se11  1  0.008  0.003  0.231  1.0
  O  O12  1  0.753  0.876  0.495  1.0
  O  O13  1  0.118  0.243  0.494  1.0
  O  O14  1  0.124  0.878  0.493  1.0
  O  O15  1  0.878  0.124  0.995  1.0
  O  O16  1  0.875  0.757  0.994  1.0
  O  O17  1  0.246  0.122  0.993  1.0
  O  O18  1  0.543  0.092  0.550  1.0
  O  O19  1  0.543  0.457  0.544  1.0
  O  O20  1  0.909  0.453  0.546  1.0
  O  O21  1  0.451  0.908  0.050  1.0
  O  O22  1  0.086  0.543  0.044  1.0
  O  O23  1  0.457  0.547  0.046  1.0
  O  O24  1  0.333  0.667  0.342  1.0
  O  O25  1  0.665  0.333  0.842  1.0
  O  O26  1  0.251  0.119  0.672  1.0
  O  O27  1  0.889  0.751  0.673  1.0
  O  O28  1  0.874  0.120  0.675  1.0
  O  O29  1  0.132  0.881  0.172  1.0
  O  O30  1  0.138  0.249  0.173  1.0
  O  O31  1  0.754  0.880  0.175  1.0
  O  O32  1  0.697  0.350  0.155  1.0
  O  O33  1  0.348  0.650  0.655  1.0
  O  O34  1  0.780  0.186  0.366  1.0
  O  O35  1  0.394  0.199  0.365  1.0
  O  O36  1  0.795  0.604  0.365  1.0
  O  O37  1  0.593  0.814  0.866  1.0
  O  O38  1  0.195  0.801  0.865  1.0
  O  O39  1  0.191  0.396  0.865  1.0
[/CIF]
.