The structure described by NaLiAl4(SiO6)2 crystallizes in the monoclinic Cc space group. Na(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 NaO6 octahedra that share corners with three equivalent Al(3)O4 tetrahedra, corners with three equivalent Al(4)O4 tetrahedra, corners with three equivalent Si(1)O4 tetrahedra, and corners with three equivalent Si(2)O4 tetrahedra. Li(1) is bonded to one O(11), one O(3), one O(5), one O(7), one O(8), and one O(9) atom to form distorted LiO6 octahedra that share  a cornercorner with one Al(3)O4 tetrahedra,  a cornercorner with one Al(4)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, edges with three equivalent Al(1)O6 octahedra, and edges with three equivalent Al(2)O6 octahedra. There are four inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(11), one O(3), one O(5), one O(7), one O(8), and one O(9) atom to form distorted AlO6 octahedra that share  a cornercorner with one Al(3)O4 tetrahedra,  a cornercorner with one Al(4)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, edges with three equivalent Li(1)O6 octahedra, and edges with three equivalent Al(2)O6 octahedra. In the second Al site, Al(2) is bonded to one O(11), one O(3), one O(5), one O(7), one O(8), and one O(9) atom to form AlO6 octahedra that share  a cornercorner with one Al(3)O4 tetrahedra,  a cornercorner with one Al(4)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, edges with three equivalent Li(1)O6 octahedra, and edges with three equivalent Al(1)O6 octahedra. In the third Al site, Al(3) is bonded to one O(1), one O(10), one O(12), and one O(7) atom to form AlO4 tetrahedra that share  a cornercorner with one Li(1)O6 octahedra,  a cornercorner with one Al(1)O6 octahedra,  a cornercorner with one Al(2)O6 octahedra, corners with three equivalent Na(1)O6 octahedra, and corners with three equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 53-69°. In the fourth Al site, Al(4) 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 Li(1)O6 octahedra,  a cornercorner with one Al(1)O6 octahedra,  a cornercorner with one Al(2)O6 octahedra, corners with three equivalent Na(1)O6 octahedra, and corners with three equivalent Si(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 54-70°. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(10), one O(12), and one O(3) atom to form SiO4 tetrahedra that share  a cornercorner with one Li(1)O6 octahedra,  a cornercorner with one Al(1)O6 octahedra,  a cornercorner with one Al(2)O6 octahedra, corners with three equivalent Na(1)O6 octahedra, and corners with three equivalent Al(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 50-66°. In the second Si site, Si(2) is bonded to one O(11), one O(2), one O(4), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Li(1)O6 octahedra,  a cornercorner with one Al(1)O6 octahedra,  a cornercorner with one Al(2)O6 octahedra, corners with three equivalent Na(1)O6 octahedra, and corners with three equivalent Al(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 51-65°. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Na(1), one Al(3), and one Si(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Na(1), one Al(4), and one Si(2) atom. In the third O site, O(3) is bonded in a rectangular see-saw-like geometry to one Li(1), one Al(1), one Al(2), and one Si(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Na(1), one Al(4), and one Si(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Li(1), one Al(1), one Al(2), and one O(9) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Na(1), one Al(4), and one Si(2) atom. In the seventh O site, O(7) is bonded in a distorted rectangular see-saw-like geometry to one Li(1), one Al(1), one Al(2), and one Al(3) atom. In the eighth O site, O(8) is bonded in a distorted trigonal pyramidal geometry to one Li(1), one Al(1), one Al(2), and one Al(4) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Li(1), one Al(1), one Al(2), and one O(5) atom. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Na(1), one Al(3), and one Si(1) atom. In the eleventh O site, O(11) is bonded in a rectangular see-saw-like geometry to one Li(1), one Al(1), one Al(2), and one Si(2) atom. In the twelfth O site, O(12) is bonded in a distorted trigonal planar geometry to one Na(1), one Al(3), and one Si(1) atom. is represented by the CIF file [CIF]
data_NaLiAl4(SiO6)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.250
_cell_length_b   5.250
_cell_length_c   19.371
_cell_angle_alpha   87.384
_cell_angle_beta   87.384
_cell_angle_gamma   119.404
_symmetry_Int_Tables_number   1
_cell_volume   463.179
_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  0.087  0.910  0.251  1.0
  Na  Na1  1  0.910  0.087  0.751  1.0
  Li  Li2  1  0.500  0.007  0.002  1.0
  Li  Li3  1  0.007  0.500  0.502  1.0
  Al  Al4  1  0.624  0.807  0.501  1.0
  Al  Al5  1  0.807  0.624  0.001  1.0
  Al  Al6  1  0.375  0.183  0.501  1.0
  Al  Al7  1  0.183  0.375  0.001  1.0
  Al  Al8  1  0.288  0.794  0.646  1.0
  Al  Al9  1  0.794  0.288  0.146  1.0
  Al  Al10  1  0.386  0.537  0.356  1.0
  Al  Al11  1  0.537  0.386  0.856  1.0
  Si  Si12  1  0.612  0.453  0.646  1.0
  Si  Si13  1  0.453  0.612  0.146  1.0
  Si  Si14  1  0.709  0.199  0.356  1.0
  Si  Si15  1  0.199  0.709  0.856  1.0
  O  O16  1  0.554  0.709  0.674  1.0
  O  O17  1  0.709  0.554  0.174  1.0
  O  O18  1  0.460  0.267  0.327  1.0
  O  O19  1  0.267  0.460  0.827  1.0
  O  O20  1  0.610  0.471  0.558  1.0
  O  O21  1  0.471  0.610  0.058  1.0
  O  O22  1  0.669  0.894  0.328  1.0
  O  O23  1  0.894  0.669  0.828  1.0
  O  O24  1  0.986  0.065  0.535  1.0
  O  O25  1  0.065  0.986  0.035  1.0
  O  O26  1  0.038  0.476  0.337  1.0
  O  O27  1  0.476  0.038  0.837  1.0
  O  O28  1  0.357  0.854  0.553  1.0
  O  O29  1  0.854  0.357  0.053  1.0
  O  O30  1  0.391  0.513  0.449  1.0
  O  O31  1  0.513  0.391  0.949  1.0
  O  O32  1  0.009  0.922  0.467  1.0
  O  O33  1  0.922  0.009  0.967  1.0
  O  O34  1  0.346  0.128  0.675  1.0
  O  O35  1  0.128  0.346  0.175  1.0
  O  O36  1  0.648  0.147  0.444  1.0
  O  O37  1  0.147  0.648  0.944  1.0
  O  O38  1  0.930  0.499  0.665  1.0
  O  O39  1  0.499  0.930  0.165  1.0
[/CIF]
.
The structure described by NaLiAl4(SiO6)2 crystallizes in the monoclinic Cc space group. Na(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 NaO6 octahedra that share corners with three equivalent Al(3)O4 tetrahedra, corners with three equivalent Al(4)O4 tetrahedra, corners with three equivalent Si(1)O4 tetrahedra, and corners with three equivalent Si(2)O4 tetrahedra. Li(1) is bonded to one O(11), one O(3), one O(5), one O(7), one O(8), and one O(9) atom to form distorted LiO6 octahedra that share  a cornercorner with one Al(3)O4 tetrahedra,  a cornercorner with one Al(4)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, edges with three equivalent Al(1)O6 octahedra, and edges with three equivalent Al(2)O6 octahedra. There are four inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(11), one O(3), one O(5), one O(7), one O(8), and one O(9) atom to form distorted AlO6 octahedra that share  a cornercorner with one Al(3)O4 tetrahedra,  a cornercorner with one Al(4)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, edges with three equivalent Li(1)O6 octahedra, and edges with three equivalent Al(2)O6 octahedra. In the second Al site, Al(2) is bonded to one O(11), one O(3), one O(5), one O(7), one O(8), and one O(9) atom to form AlO6 octahedra that share  a cornercorner with one Al(3)O4 tetrahedra,  a cornercorner with one Al(4)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, edges with three equivalent Li(1)O6 octahedra, and edges with three equivalent Al(1)O6 octahedra. In the third Al site, Al(3) is bonded to one O(1), one O(10), one O(12), and one O(7) atom to form AlO4 tetrahedra that share  a cornercorner with one Li(1)O6 octahedra,  a cornercorner with one Al(1)O6 octahedra,  a cornercorner with one Al(2)O6 octahedra, corners with three equivalent Na(1)O6 octahedra, and corners with three equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 53-69°. In the fourth Al site, Al(4) 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 Li(1)O6 octahedra,  a cornercorner with one Al(1)O6 octahedra,  a cornercorner with one Al(2)O6 octahedra, corners with three equivalent Na(1)O6 octahedra, and corners with three equivalent Si(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 54-70°. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(10), one O(12), and one O(3) atom to form SiO4 tetrahedra that share  a cornercorner with one Li(1)O6 octahedra,  a cornercorner with one Al(1)O6 octahedra,  a cornercorner with one Al(2)O6 octahedra, corners with three equivalent Na(1)O6 octahedra, and corners with three equivalent Al(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 50-66°. In the second Si site, Si(2) is bonded to one O(11), one O(2), one O(4), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Li(1)O6 octahedra,  a cornercorner with one Al(1)O6 octahedra,  a cornercorner with one Al(2)O6 octahedra, corners with three equivalent Na(1)O6 octahedra, and corners with three equivalent Al(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 51-65°. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Na(1), one Al(3), and one Si(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Na(1), one Al(4), and one Si(2) atom. In the third O site, O(3) is bonded in a rectangular see-saw-like geometry to one Li(1), one Al(1), one Al(2), and one Si(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Na(1), one Al(4), and one Si(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Li(1), one Al(1), one Al(2), and one O(9) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Na(1), one Al(4), and one Si(2) atom. In the seventh O site, O(7) is bonded in a distorted rectangular see-saw-like geometry to one Li(1), one Al(1), one Al(2), and one Al(3) atom. In the eighth O site, O(8) is bonded in a distorted trigonal pyramidal geometry to one Li(1), one Al(1), one Al(2), and one Al(4) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Li(1), one Al(1), one Al(2), and one O(5) atom. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Na(1), one Al(3), and one Si(1) atom. In the eleventh O site, O(11) is bonded in a rectangular see-saw-like geometry to one Li(1), one Al(1), one Al(2), and one Si(2) atom. In the twelfth O site, O(12) is bonded in a distorted trigonal planar geometry to one Na(1), one Al(3), and one Si(1) atom. is represented by the CIF file [CIF]
data_NaLiAl4(SiO6)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.250
_cell_length_b   5.250
_cell_length_c   19.371
_cell_angle_alpha   87.384
_cell_angle_beta   87.384
_cell_angle_gamma   119.404
_symmetry_Int_Tables_number   1
_cell_volume   463.179
_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  0.087  0.910  0.251  1.0
  Na  Na1  1  0.910  0.087  0.751  1.0
  Li  Li2  1  0.500  0.007  0.002  1.0
  Li  Li3  1  0.007  0.500  0.502  1.0
  Al  Al4  1  0.624  0.807  0.501  1.0
  Al  Al5  1  0.807  0.624  0.001  1.0
  Al  Al6  1  0.375  0.183  0.501  1.0
  Al  Al7  1  0.183  0.375  0.001  1.0
  Al  Al8  1  0.288  0.794  0.646  1.0
  Al  Al9  1  0.794  0.288  0.146  1.0
  Al  Al10  1  0.386  0.537  0.356  1.0
  Al  Al11  1  0.537  0.386  0.856  1.0
  Si  Si12  1  0.612  0.453  0.646  1.0
  Si  Si13  1  0.453  0.612  0.146  1.0
  Si  Si14  1  0.709  0.199  0.356  1.0
  Si  Si15  1  0.199  0.709  0.856  1.0
  O  O16  1  0.554  0.709  0.674  1.0
  O  O17  1  0.709  0.554  0.174  1.0
  O  O18  1  0.460  0.267  0.327  1.0
  O  O19  1  0.267  0.460  0.827  1.0
  O  O20  1  0.610  0.471  0.558  1.0
  O  O21  1  0.471  0.610  0.058  1.0
  O  O22  1  0.669  0.894  0.328  1.0
  O  O23  1  0.894  0.669  0.828  1.0
  O  O24  1  0.986  0.065  0.535  1.0
  O  O25  1  0.065  0.986  0.035  1.0
  O  O26  1  0.038  0.476  0.337  1.0
  O  O27  1  0.476  0.038  0.837  1.0
  O  O28  1  0.357  0.854  0.553  1.0
  O  O29  1  0.854  0.357  0.053  1.0
  O  O30  1  0.391  0.513  0.449  1.0
  O  O31  1  0.513  0.391  0.949  1.0
  O  O32  1  0.009  0.922  0.467  1.0
  O  O33  1  0.922  0.009  0.967  1.0
  O  O34  1  0.346  0.128  0.675  1.0
  O  O35  1  0.128  0.346  0.175  1.0
  O  O36  1  0.648  0.147  0.444  1.0
  O  O37  1  0.147  0.648  0.944  1.0
  O  O38  1  0.930  0.499  0.665  1.0
  O  O39  1  0.499  0.930  0.165  1.0
[/CIF]
.