The structure described by NaAl3Si3O11 crystallizes in the monoclinic Cc space group. Na(1) is bonded in a 6-coordinate geometry to one O(1), one O(10), one O(11), one O(2), one O(7), and one O(8) atom. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(3), one O(4), one O(5), one O(6), and one O(9) atom to form distorted AlO5 trigonal bipyramids that share  a cornercorner with one Al(3)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Al(2)O5 trigonal bipyramid, and edges with two equivalent Al(2)O5 trigonal bipyramids. In the second Al site, Al(2) is bonded to one O(3), one O(4), one O(5), one O(6), and one O(9) atom to form distorted AlO5 trigonal bipyramids that share  a cornercorner with one Al(3)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Al(1)O5 trigonal bipyramid, and edges with two equivalent Al(1)O5 trigonal bipyramids. In the third Al site, Al(3) is bonded to one O(1), one O(10), one O(3), and one O(7) atom to form AlO4 tetrahedra that share corners with three equivalent Si(2)O4 tetrahedra,  a cornercorner with one Al(1)O5 trigonal bipyramid, and  a cornercorner with one Al(2)O5 trigonal bipyramid. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(11), one O(2), one O(4), and one O(8) atom to form SiO4 tetrahedra that share corners with three equivalent Si(3)O4 tetrahedra,  a cornercorner with one Al(1)O5 trigonal bipyramid, and  a cornercorner with one Al(2)O5 trigonal bipyramid. In the second Si site, Si(2) is bonded to one O(1), one O(10), one O(5), and one O(7) atom to form SiO4 tetrahedra that share corners with three equivalent Al(3)O4 tetrahedra,  a cornercorner with one Al(1)O5 trigonal bipyramid, and  a cornercorner with one Al(2)O5 trigonal bipyramid. In the third Si site, Si(3) is bonded to one O(11), one O(2), one O(6), and one O(8) atom to form SiO4 tetrahedra that share corners with three equivalent Si(1)O4 tetrahedra,  a cornercorner with one Al(1)O5 trigonal bipyramid, and  a cornercorner with one Al(2)O5 trigonal bipyramid. There are eleven inequivalent O sites. In the first O site, O(3) is bonded in a trigonal planar geometry to one Al(1), one Al(2), and one Al(3) atom. In the second O site, O(4) is bonded in a 3-coordinate geometry to one Al(1), one Al(2), and one Si(1) atom. In the third O site, O(5) is bonded in a trigonal planar geometry to one Al(1), one Al(2), and one Si(2) atom. In the fourth O site, O(6) is bonded in a distorted trigonal planar geometry to one Al(1), one Al(2), and one Si(3) atom. In the fifth O site, O(7) is bonded in a distorted bent 150 degrees geometry to one Na(1), one Al(3), and one Si(2) atom. In the sixth O site, O(8) is bonded in a bent 150 degrees geometry to one Na(1), one Si(1), and one Si(3) atom. In the seventh O site, O(9) is bonded in a linear geometry to one Al(1) and one Al(2) atom. In the eighth O site, O(10) is bonded in a distorted trigonal planar geometry to one Na(1), one Al(3), and one Si(2) atom. In the ninth O site, O(11) is bonded in a distorted bent 120 degrees geometry to one Na(1), one Si(1), and one Si(3) atom. In the tenth O site, O(1) is bonded in a distorted trigonal planar geometry to one Na(1), one Al(3), and one Si(2) atom. In the eleventh O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Na(1), one Si(1), and one Si(3) atom. is represented by the CIF file [CIF]
data_NaAl3Si3O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.232
_cell_length_b   5.328
_cell_length_c   20.443
_cell_angle_alpha   90.305
_cell_angle_beta   89.379
_cell_angle_gamma   119.406
_symmetry_Int_Tables_number   1
_cell_volume   496.340
_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  0.016  0.999  0.263  1.0
  Na  Na1  1  0.017  0.001  0.763  1.0
  Al  Al2  1  0.362  0.177  0.497  1.0
  Al  Al3  1  0.826  0.201  0.997  1.0
  Al  Al4  1  0.625  0.799  0.497  1.0
  Al  Al5  1  0.186  0.823  0.997  1.0
  Al  Al6  1  0.661  0.499  0.363  1.0
  Al  Al7  1  0.162  0.501  0.863  1.0
  Si  Si8  1  0.842  0.505  0.134  1.0
  Si  Si9  1  0.337  0.495  0.634  1.0
  Si  Si10  1  0.365  0.855  0.361  1.0
  Si  Si11  1  0.496  0.859  0.134  1.0
  Si  Si12  1  0.638  0.141  0.634  1.0
  Si  Si13  1  0.509  0.145  0.861  1.0
  O  O14  1  0.594  0.764  0.329  1.0
  O  O15  1  0.166  0.706  0.168  1.0
  O  O16  1  0.460  0.294  0.668  1.0
  O  O17  1  0.830  0.236  0.829  1.0
  O  O18  1  0.565  0.484  0.446  1.0
  O  O19  1  0.889  0.484  0.057  1.0
  O  O20  1  0.405  0.516  0.557  1.0
  O  O21  1  0.081  0.516  0.946  1.0
  O  O22  1  0.433  0.919  0.442  1.0
  O  O23  1  0.477  0.906  0.056  1.0
  O  O24  1  0.571  0.094  0.556  1.0
  O  O25  1  0.514  0.081  0.942  1.0
  O  O26  1  0.029  0.610  0.346  1.0
  O  O27  1  0.649  0.664  0.154  1.0
  O  O28  1  0.986  0.336  0.654  1.0
  O  O29  1  0.419  0.390  0.846  1.0
  O  O30  1  0.993  0.986  0.507  1.0
  O  O31  1  0.008  0.014  0.007  1.0
  O  O32  1  0.422  0.159  0.329  1.0
  O  O33  1  0.693  0.181  0.168  1.0
  O  O34  1  0.512  0.819  0.668  1.0
  O  O35  1  0.263  0.841  0.829  1.0
[/CIF]
.
The structure described by NaAl3Si3O11 crystallizes in the monoclinic Cc space group. Na(1) is bonded in a 6-coordinate geometry to one O(1), one O(10), one O(11), one O(2), one O(7), and one O(8) atom. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(3), one O(4), one O(5), one O(6), and one O(9) atom to form distorted AlO5 trigonal bipyramids that share  a cornercorner with one Al(3)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Al(2)O5 trigonal bipyramid, and edges with two equivalent Al(2)O5 trigonal bipyramids. In the second Al site, Al(2) is bonded to one O(3), one O(4), one O(5), one O(6), and one O(9) atom to form distorted AlO5 trigonal bipyramids that share  a cornercorner with one Al(3)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Al(1)O5 trigonal bipyramid, and edges with two equivalent Al(1)O5 trigonal bipyramids. In the third Al site, Al(3) is bonded to one O(1), one O(10), one O(3), and one O(7) atom to form AlO4 tetrahedra that share corners with three equivalent Si(2)O4 tetrahedra,  a cornercorner with one Al(1)O5 trigonal bipyramid, and  a cornercorner with one Al(2)O5 trigonal bipyramid. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(11), one O(2), one O(4), and one O(8) atom to form SiO4 tetrahedra that share corners with three equivalent Si(3)O4 tetrahedra,  a cornercorner with one Al(1)O5 trigonal bipyramid, and  a cornercorner with one Al(2)O5 trigonal bipyramid. In the second Si site, Si(2) is bonded to one O(1), one O(10), one O(5), and one O(7) atom to form SiO4 tetrahedra that share corners with three equivalent Al(3)O4 tetrahedra,  a cornercorner with one Al(1)O5 trigonal bipyramid, and  a cornercorner with one Al(2)O5 trigonal bipyramid. In the third Si site, Si(3) is bonded to one O(11), one O(2), one O(6), and one O(8) atom to form SiO4 tetrahedra that share corners with three equivalent Si(1)O4 tetrahedra,  a cornercorner with one Al(1)O5 trigonal bipyramid, and  a cornercorner with one Al(2)O5 trigonal bipyramid. There are eleven inequivalent O sites. In the first O site, O(3) is bonded in a trigonal planar geometry to one Al(1), one Al(2), and one Al(3) atom. In the second O site, O(4) is bonded in a 3-coordinate geometry to one Al(1), one Al(2), and one Si(1) atom. In the third O site, O(5) is bonded in a trigonal planar geometry to one Al(1), one Al(2), and one Si(2) atom. In the fourth O site, O(6) is bonded in a distorted trigonal planar geometry to one Al(1), one Al(2), and one Si(3) atom. In the fifth O site, O(7) is bonded in a distorted bent 150 degrees geometry to one Na(1), one Al(3), and one Si(2) atom. In the sixth O site, O(8) is bonded in a bent 150 degrees geometry to one Na(1), one Si(1), and one Si(3) atom. In the seventh O site, O(9) is bonded in a linear geometry to one Al(1) and one Al(2) atom. In the eighth O site, O(10) is bonded in a distorted trigonal planar geometry to one Na(1), one Al(3), and one Si(2) atom. In the ninth O site, O(11) is bonded in a distorted bent 120 degrees geometry to one Na(1), one Si(1), and one Si(3) atom. In the tenth O site, O(1) is bonded in a distorted trigonal planar geometry to one Na(1), one Al(3), and one Si(2) atom. In the eleventh O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Na(1), one Si(1), and one Si(3) atom. is represented by the CIF file [CIF]
data_NaAl3Si3O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.232
_cell_length_b   5.328
_cell_length_c   20.443
_cell_angle_alpha   90.305
_cell_angle_beta   89.379
_cell_angle_gamma   119.406
_symmetry_Int_Tables_number   1
_cell_volume   496.340
_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  0.016  0.999  0.263  1.0
  Na  Na1  1  0.017  0.001  0.763  1.0
  Al  Al2  1  0.362  0.177  0.497  1.0
  Al  Al3  1  0.826  0.201  0.997  1.0
  Al  Al4  1  0.625  0.799  0.497  1.0
  Al  Al5  1  0.186  0.823  0.997  1.0
  Al  Al6  1  0.661  0.499  0.363  1.0
  Al  Al7  1  0.162  0.501  0.863  1.0
  Si  Si8  1  0.842  0.505  0.134  1.0
  Si  Si9  1  0.337  0.495  0.634  1.0
  Si  Si10  1  0.365  0.855  0.361  1.0
  Si  Si11  1  0.496  0.859  0.134  1.0
  Si  Si12  1  0.638  0.141  0.634  1.0
  Si  Si13  1  0.509  0.145  0.861  1.0
  O  O14  1  0.594  0.764  0.329  1.0
  O  O15  1  0.166  0.706  0.168  1.0
  O  O16  1  0.460  0.294  0.668  1.0
  O  O17  1  0.830  0.236  0.829  1.0
  O  O18  1  0.565  0.484  0.446  1.0
  O  O19  1  0.889  0.484  0.057  1.0
  O  O20  1  0.405  0.516  0.557  1.0
  O  O21  1  0.081  0.516  0.946  1.0
  O  O22  1  0.433  0.919  0.442  1.0
  O  O23  1  0.477  0.906  0.056  1.0
  O  O24  1  0.571  0.094  0.556  1.0
  O  O25  1  0.514  0.081  0.942  1.0
  O  O26  1  0.029  0.610  0.346  1.0
  O  O27  1  0.649  0.664  0.154  1.0
  O  O28  1  0.986  0.336  0.654  1.0
  O  O29  1  0.419  0.390  0.846  1.0
  O  O30  1  0.993  0.986  0.507  1.0
  O  O31  1  0.008  0.014  0.007  1.0
  O  O32  1  0.422  0.159  0.329  1.0
  O  O33  1  0.693  0.181  0.168  1.0
  O  O34  1  0.512  0.819  0.668  1.0
  O  O35  1  0.263  0.841  0.829  1.0
[/CIF]
.