The crystal structure described by Na2Al2Si3O10 crystallizes in the monoclinic C2 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 5-coordinate geometry to one O(1), one O(10), one O(2), one O(3), and one O(5) atom. In the second Na site, Na(2) is bonded in a 5-coordinate geometry to one O(10), one O(2), one O(4), one O(8), and one O(9) atom. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(1), one O(3), one O(5), and one O(7) atom to form AlO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, and corners with two equivalent Si(4)O4 tetrahedra. In the second Al site, Al(2) is bonded to one O(2), one O(4), one O(6), and one O(8) atom to form AlO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, and corners with two equivalent Si(3)O4 tetrahedra. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded to two equivalent O(1) and two equivalent O(9) atoms to form SiO4 tetrahedra that share corners with two equivalent Al(1)O4 tetrahedra and corners with two equivalent Si(4)O4 tetrahedra. In the second Si site, Si(2) is bonded to two equivalent O(10) and two equivalent O(2) atoms to form SiO4 tetrahedra that share corners with two equivalent Al(2)O4 tetrahedra and corners with two equivalent Si(3)O4 tetrahedra. In the third Si site, Si(3) is bonded to one O(10), one O(3), one O(6), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Al(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, and corners with two equivalent Al(2)O4 tetrahedra. In the fourth Si site, Si(4) is bonded to one O(4), one O(5), one O(7), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Al(2)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra, and corners with two equivalent Al(1)O4 tetrahedra. There are ten inequivalent O sites. In the first O site, O(3) is bonded in a distorted trigonal planar geometry to one Na(1), one Al(1), and one Si(3) atom. In the second O site, O(4) is bonded in a distorted trigonal planar geometry to one Na(2), one Al(2), and one Si(4) atom. In the third O site, O(5) is bonded in a distorted trigonal planar geometry to one Na(1), one Al(1), and one Si(4) atom. In the fourth O site, O(6) is bonded in a bent 120 degrees geometry to one Al(2) and one Si(3) atom. In the fifth O site, O(7) is bonded in a distorted bent 120 degrees geometry to one Al(1) and one Si(4) atom. In the sixth O site, O(8) is bonded in a 2-coordinate geometry to one Na(2), one Al(2), and one Si(3) atom. In the seventh O site, O(9) is bonded in a 3-coordinate geometry to one Na(2), one Si(1), and one Si(4) atom. In the eighth O site, O(10) is bonded in a 2-coordinate geometry to one Na(1), one Na(2), one Si(2), and one Si(3) atom. In the ninth O site, O(1) is bonded in a 3-coordinate geometry to one Na(1), one Al(1), and one Si(1) atom. In the tenth O site, O(2) is bonded in a 4-coordinate geometry to one Na(1), one Na(2), one Al(2), and one Si(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na2Al2Si3O10
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.800
_cell_length_b   8.800
_cell_length_c   11.725
_cell_angle_alpha   50.271
_cell_angle_beta   50.271
_cell_angle_gamma   43.330
_symmetry_Int_Tables_number   1
_cell_volume   452.330
_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  0.389  0.099  0.637  1.0
  Na  Na1  1  0.901  0.611  0.363  1.0
  Na  Na2  1  0.763  0.967  0.855  1.0
  Na  Na3  1  0.033  0.237  0.145  1.0
  Al  Al4  1  0.746  0.516  0.787  1.0
  Al  Al5  1  0.484  0.254  0.213  1.0
  Al  Al6  1  0.281  0.536  0.717  1.0
  Al  Al7  1  0.464  0.719  0.283  1.0
  Si  Si8  1  0.996  0.004  0.000  1.0
  Si  Si9  1  0.754  0.246  0.500  1.0
  Si  Si10  1  0.998  0.746  0.530  1.0
  Si  Si11  1  0.254  0.002  0.470  1.0
  Si  Si12  1  0.460  0.720  0.040  1.0
  Si  Si13  1  0.280  0.540  0.960  1.0
  O  O14  1  0.982  0.244  0.856  1.0
  O  O15  1  0.756  0.018  0.144  1.0
  O  O16  1  0.526  0.283  0.659  1.0
  O  O17  1  0.717  0.474  0.341  1.0
  O  O18  1  0.858  0.644  0.580  1.0
  O  O19  1  0.356  0.142  0.420  1.0
  O  O20  1  0.527  0.812  0.079  1.0
  O  O21  1  0.188  0.473  0.921  1.0
  O  O22  1  0.571  0.750  0.855  1.0
  O  O23  1  0.250  0.429  0.145  1.0
  O  O24  1  0.247  0.655  0.393  1.0
  O  O25  1  0.345  0.753  0.607  1.0
  O  O26  1  0.554  0.446  0.150  1.0
  O  O27  1  0.554  0.446  0.850  1.0
  O  O28  1  0.033  0.667  0.684  1.0
  O  O29  1  0.333  0.967  0.316  1.0
  O  O30  1  0.170  0.895  0.082  1.0
  O  O31  1  0.105  0.830  0.918  1.0
  O  O32  1  0.829  0.040  0.466  1.0
  O  O33  1  0.960  0.171  0.534  1.0
[/CIF]
.
The crystal structure described by Na2Al2Si3O10 crystallizes in the monoclinic C2 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 5-coordinate geometry to one O(1), one O(10), one O(2), one O(3), and one O(5) atom. In the second Na site, Na(2) is bonded in a 5-coordinate geometry to one O(10), one O(2), one O(4), one O(8), and one O(9) atom. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(1), one O(3), one O(5), and one O(7) atom to form AlO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, and corners with two equivalent Si(4)O4 tetrahedra. In the second Al site, Al(2) is bonded to one O(2), one O(4), one O(6), and one O(8) atom to form AlO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, and corners with two equivalent Si(3)O4 tetrahedra. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded to two equivalent O(1) and two equivalent O(9) atoms to form SiO4 tetrahedra that share corners with two equivalent Al(1)O4 tetrahedra and corners with two equivalent Si(4)O4 tetrahedra. In the second Si site, Si(2) is bonded to two equivalent O(10) and two equivalent O(2) atoms to form SiO4 tetrahedra that share corners with two equivalent Al(2)O4 tetrahedra and corners with two equivalent Si(3)O4 tetrahedra. In the third Si site, Si(3) is bonded to one O(10), one O(3), one O(6), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Al(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, and corners with two equivalent Al(2)O4 tetrahedra. In the fourth Si site, Si(4) is bonded to one O(4), one O(5), one O(7), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Al(2)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra, and corners with two equivalent Al(1)O4 tetrahedra. There are ten inequivalent O sites. In the first O site, O(3) is bonded in a distorted trigonal planar geometry to one Na(1), one Al(1), and one Si(3) atom. In the second O site, O(4) is bonded in a distorted trigonal planar geometry to one Na(2), one Al(2), and one Si(4) atom. In the third O site, O(5) is bonded in a distorted trigonal planar geometry to one Na(1), one Al(1), and one Si(4) atom. In the fourth O site, O(6) is bonded in a bent 120 degrees geometry to one Al(2) and one Si(3) atom. In the fifth O site, O(7) is bonded in a distorted bent 120 degrees geometry to one Al(1) and one Si(4) atom. In the sixth O site, O(8) is bonded in a 2-coordinate geometry to one Na(2), one Al(2), and one Si(3) atom. In the seventh O site, O(9) is bonded in a 3-coordinate geometry to one Na(2), one Si(1), and one Si(4) atom. In the eighth O site, O(10) is bonded in a 2-coordinate geometry to one Na(1), one Na(2), one Si(2), and one Si(3) atom. In the ninth O site, O(1) is bonded in a 3-coordinate geometry to one Na(1), one Al(1), and one Si(1) atom. In the tenth O site, O(2) is bonded in a 4-coordinate geometry to one Na(1), one Na(2), one Al(2), and one Si(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na2Al2Si3O10
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.800
_cell_length_b   8.800
_cell_length_c   11.725
_cell_angle_alpha   50.271
_cell_angle_beta   50.271
_cell_angle_gamma   43.330
_symmetry_Int_Tables_number   1
_cell_volume   452.330
_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  0.389  0.099  0.637  1.0
  Na  Na1  1  0.901  0.611  0.363  1.0
  Na  Na2  1  0.763  0.967  0.855  1.0
  Na  Na3  1  0.033  0.237  0.145  1.0
  Al  Al4  1  0.746  0.516  0.787  1.0
  Al  Al5  1  0.484  0.254  0.213  1.0
  Al  Al6  1  0.281  0.536  0.717  1.0
  Al  Al7  1  0.464  0.719  0.283  1.0
  Si  Si8  1  0.996  0.004  0.000  1.0
  Si  Si9  1  0.754  0.246  0.500  1.0
  Si  Si10  1  0.998  0.746  0.530  1.0
  Si  Si11  1  0.254  0.002  0.470  1.0
  Si  Si12  1  0.460  0.720  0.040  1.0
  Si  Si13  1  0.280  0.540  0.960  1.0
  O  O14  1  0.982  0.244  0.856  1.0
  O  O15  1  0.756  0.018  0.144  1.0
  O  O16  1  0.526  0.283  0.659  1.0
  O  O17  1  0.717  0.474  0.341  1.0
  O  O18  1  0.858  0.644  0.580  1.0
  O  O19  1  0.356  0.142  0.420  1.0
  O  O20  1  0.527  0.812  0.079  1.0
  O  O21  1  0.188  0.473  0.921  1.0
  O  O22  1  0.571  0.750  0.855  1.0
  O  O23  1  0.250  0.429  0.145  1.0
  O  O24  1  0.247  0.655  0.393  1.0
  O  O25  1  0.345  0.753  0.607  1.0
  O  O26  1  0.554  0.446  0.150  1.0
  O  O27  1  0.554  0.446  0.850  1.0
  O  O28  1  0.033  0.667  0.684  1.0
  O  O29  1  0.333  0.967  0.316  1.0
  O  O30  1  0.170  0.895  0.082  1.0
  O  O31  1  0.105  0.830  0.918  1.0
  O  O32  1  0.829  0.040  0.466  1.0
  O  O33  1  0.960  0.171  0.534  1.0
[/CIF]
.