The crystal structure described by Na2Al2Si3O10 crystallizes in the orthorhombic Fdd2 space group. Na(1) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(4), and one O(5) atom. Al(1) is bonded to one O(1), one O(3), one O(4), and one O(5) atom to form AlO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra and corners with three equivalent Si(1)O4 tetrahedra. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra and corners with three equivalent Al(1)O4 tetrahedra. In the second Si site, Si(2) is bonded to two equivalent O(2) and two equivalent O(5) atoms to form SiO4 tetrahedra that share corners with two equivalent Al(1)O4 tetrahedra and corners with two equivalent Si(1)O4 tetrahedra. There are five inequivalent O sites. In the first O site, O(3) is bonded in a bent 150 degrees geometry to one Al(1) and one Si(1) atom. In the second O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Na(1), one Al(1), and one Si(1) atom. In the third O site, O(5) is bonded in a distorted trigonal non-coplanar geometry to one Na(1), one Al(1), and one Si(2) atom. In the fourth 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 fifth O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Na(1), one Si(1), and one Si(2) atom. is represented by the CIF card [CIF]
data_Na2Al2Si3O10
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.562
_cell_length_b   9.648
_cell_length_c   9.649
_cell_angle_alpha   96.640
_cell_angle_beta   70.123
_cell_angle_gamma   109.881
_symmetry_Int_Tables_number   1
_cell_volume   540.203
_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  0.801  0.935  0.354  1.0
  Na  Na1  1  0.220  0.065  0.646  1.0
  Na  Na2  1  0.116  0.565  0.854  1.0
  Na  Na3  1  0.405  0.435  0.146  1.0
  Al  Al4  1  0.994  0.573  0.303  1.0
  Al  Al5  1  0.724  0.427  0.697  1.0
  Al  Al6  1  0.671  0.927  0.803  1.0
  Al  Al7  1  0.547  0.073  0.197  1.0
  Si  Si8  1  0.241  0.799  0.068  1.0
  Si  Si9  1  0.510  0.201  0.932  1.0
  Si  Si10  1  0.692  0.701  0.568  1.0
  Si  Si11  1  0.559  0.299  0.432  1.0
  Si  Si12  1  0.248  0.500  0.500  1.0
  Si  Si13  1  0.998  0.000  0.000  1.0
  O  O14  1  0.864  0.703  0.400  1.0
  O  O15  1  0.562  0.297  0.600  1.0
  O  O16  1  0.412  0.797  0.900  1.0
  O  O17  1  0.514  0.203  0.100  1.0
  O  O18  1  0.038  0.864  0.064  1.0
  O  O19  1  0.238  0.136  0.936  1.0
  O  O20  1  0.424  0.636  0.564  1.0
  O  O21  1  0.352  0.364  0.436  1.0
  O  O22  1  0.362  0.897  0.183  1.0
  O  O23  1  0.648  0.103  0.817  1.0
  O  O24  1  0.715  0.603  0.683  1.0
  O  O25  1  0.795  0.397  0.317  1.0
  O  O26  1  0.118  0.625  0.115  1.0
  O  O27  1  0.608  0.375  0.885  1.0
  O  O28  1  0.742  0.875  0.615  1.0
  O  O29  1  0.483  0.125  0.385  1.0
  O  O30  1  0.214  0.555  0.359  1.0
  O  O31  1  0.018  0.445  0.641  1.0
  O  O32  1  0.909  0.945  0.859  1.0
  O  O33  1  0.823  0.055  0.141  1.0
[/CIF]
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The crystal structure described by Na2Al2Si3O10 crystallizes in the orthorhombic Fdd2 space group. Na(1) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(4), and one O(5) atom. Al(1) is bonded to one O(1), one O(3), one O(4), and one O(5) atom to form AlO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra and corners with three equivalent Si(1)O4 tetrahedra. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra and corners with three equivalent Al(1)O4 tetrahedra. In the second Si site, Si(2) is bonded to two equivalent O(2) and two equivalent O(5) atoms to form SiO4 tetrahedra that share corners with two equivalent Al(1)O4 tetrahedra and corners with two equivalent Si(1)O4 tetrahedra. There are five inequivalent O sites. In the first O site, O(3) is bonded in a bent 150 degrees geometry to one Al(1) and one Si(1) atom. In the second O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Na(1), one Al(1), and one Si(1) atom. In the third O site, O(5) is bonded in a distorted trigonal non-coplanar geometry to one Na(1), one Al(1), and one Si(2) atom. In the fourth 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 fifth O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Na(1), one Si(1), and one Si(2) atom. is represented by the CIF card [CIF]
data_Na2Al2Si3O10
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.562
_cell_length_b   9.648
_cell_length_c   9.649
_cell_angle_alpha   96.640
_cell_angle_beta   70.123
_cell_angle_gamma   109.881
_symmetry_Int_Tables_number   1
_cell_volume   540.203
_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  0.801  0.935  0.354  1.0
  Na  Na1  1  0.220  0.065  0.646  1.0
  Na  Na2  1  0.116  0.565  0.854  1.0
  Na  Na3  1  0.405  0.435  0.146  1.0
  Al  Al4  1  0.994  0.573  0.303  1.0
  Al  Al5  1  0.724  0.427  0.697  1.0
  Al  Al6  1  0.671  0.927  0.803  1.0
  Al  Al7  1  0.547  0.073  0.197  1.0
  Si  Si8  1  0.241  0.799  0.068  1.0
  Si  Si9  1  0.510  0.201  0.932  1.0
  Si  Si10  1  0.692  0.701  0.568  1.0
  Si  Si11  1  0.559  0.299  0.432  1.0
  Si  Si12  1  0.248  0.500  0.500  1.0
  Si  Si13  1  0.998  0.000  0.000  1.0
  O  O14  1  0.864  0.703  0.400  1.0
  O  O15  1  0.562  0.297  0.600  1.0
  O  O16  1  0.412  0.797  0.900  1.0
  O  O17  1  0.514  0.203  0.100  1.0
  O  O18  1  0.038  0.864  0.064  1.0
  O  O19  1  0.238  0.136  0.936  1.0
  O  O20  1  0.424  0.636  0.564  1.0
  O  O21  1  0.352  0.364  0.436  1.0
  O  O22  1  0.362  0.897  0.183  1.0
  O  O23  1  0.648  0.103  0.817  1.0
  O  O24  1  0.715  0.603  0.683  1.0
  O  O25  1  0.795  0.397  0.317  1.0
  O  O26  1  0.118  0.625  0.115  1.0
  O  O27  1  0.608  0.375  0.885  1.0
  O  O28  1  0.742  0.875  0.615  1.0
  O  O29  1  0.483  0.125  0.385  1.0
  O  O30  1  0.214  0.555  0.359  1.0
  O  O31  1  0.018  0.445  0.641  1.0
  O  O32  1  0.909  0.945  0.859  1.0
  O  O33  1  0.823  0.055  0.141  1.0
[/CIF]
.