The structure described by Al(SiO3)2 is Low Tridymite-derived structured and crystallizes in the triclinic P1 space group. There are four inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(10), one O(17), one O(19), and one O(3) atom to form AlO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(6)O4 tetrahedra, and  a cornercorner with one Si(8)O4 tetrahedra. In the second Al site, Al(2) is bonded to one O(1), one O(12), one O(13), and one O(20) atom to form AlO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, and  a cornercorner with one Si(8)O4 tetrahedra. In the third Al site, Al(3) is bonded to one O(15), one O(2), one O(21), and one O(8) atom to form AlO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, and  a cornercorner with one Si(6)O4 tetrahedra. In the fourth Al site, Al(4) is bonded to one O(18), one O(22), one O(6), and one O(9) atom to form AlO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, and  a cornercorner with one Si(6)O4 tetrahedra. There are eight inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(11), one O(16), one O(19), and one O(2) atom to form SiO4 tetrahedra that share  a cornercorner with one Al(1)O4 tetrahedra,  a cornercorner with one Al(3)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra, and  a cornercorner with one Si(7)O4 tetrahedra. In the second Si site, Si(2) is bonded to one O(18), one O(20), one O(3), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Al(1)O4 tetrahedra,  a cornercorner with one Al(2)O4 tetrahedra,  a cornercorner with one Al(4)O4 tetrahedra, and  a cornercorner with one Si(7)O4 tetrahedra. In the third Si site, Si(3) is bonded to one O(1), one O(14), one O(21), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Al(2)O4 tetrahedra,  a cornercorner with one Al(3)O4 tetrahedra,  a cornercorner with one Al(4)O4 tetrahedra, and  a cornercorner with one Si(5)O4 tetrahedra. In the fourth Si site, Si(4) is bonded to one O(12), one O(15), one O(22), and one O(5) atom to form SiO4 tetrahedra that share  a cornercorner with one Al(2)O4 tetrahedra,  a cornercorner with one Al(3)O4 tetrahedra,  a cornercorner with one Al(4)O4 tetrahedra, and  a cornercorner with one Si(7)O4 tetrahedra. In the fifth Si site, Si(5) is bonded to one O(11), one O(14), one O(23), and one O(4) atom to form corner-sharing SiO4 tetrahedra. In the sixth Si site, Si(6) is bonded to one O(17), one O(23), 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 Al(3)O4 tetrahedra,  a cornercorner with one Al(4)O4 tetrahedra, and  a cornercorner with one Si(5)O4 tetrahedra. In the seventh Si site, Si(7) is bonded to one O(16), one O(24), one O(5), and one O(7) atom to form corner-sharing SiO4 tetrahedra. In the eighth Si site, Si(8) is bonded to one O(10), one O(13), one O(24), and one O(4) atom to form SiO4 tetrahedra that share  a cornercorner with one Al(1)O4 tetrahedra,  a cornercorner with one Al(2)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra, and  a cornercorner with one Si(7)O4 tetrahedra. There are twenty-four inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Al(2) and one Si(3) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Al(3) and one Si(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Al(1) and one Si(2) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Si(5) and one Si(8) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Si(4) and one Si(7) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Al(4) and one Si(6) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one Si(2) and one Si(7) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one Al(3) and one Si(6) atom. In the ninth O site, O(9) is bonded in a bent 150 degrees geometry to one Al(4) and one Si(3) atom. In the tenth O site, O(10) is bonded in a bent 150 degrees geometry to one Al(1) and one Si(8) atom. In the eleventh O site, O(11) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(5) atom. In the twelfth O site, O(12) is bonded in a bent 150 degrees geometry to one Al(2) and one Si(4) atom. In the thirteenth O site, O(13) is bonded in a bent 150 degrees geometry to one Al(2) and one Si(8) atom. In the fourteenth O site, O(14) is bonded in a bent 150 degrees geometry to one Si(3) and one Si(5) atom. In the fifteenth O site, O(15) is bonded in a bent 150 degrees geometry to one Al(3) and one Si(4) atom. In the sixteenth O site, O(16) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(7) atom. In the seventeenth O site, O(17) is bonded in a bent 150 degrees geometry to one Al(1) and one Si(6) atom. In the eighteenth O site, O(18) is bonded in a bent 150 degrees geometry to one Al(4) and one Si(2) atom. In the nineteenth O site, O(19) is bonded in a bent 150 degrees geometry to one Al(1) and one Si(1) atom. In the twentieth O site, O(20) is bonded in a bent 150 degrees geometry to one Al(2) and one Si(2) atom. In the twenty-first O site, O(21) is bonded in a bent 150 degrees geometry to one Al(3) and one Si(3) atom. In the twenty-second O site, O(22) is bonded in a bent 150 degrees geometry to one Al(4) and one Si(4) atom. In the twenty-third O site, O(23) is bonded in a bent 150 degrees geometry to one Si(5) and one Si(6) atom. In the twenty-fourth O site, O(24) is bonded in a bent 150 degrees geometry to one Si(7) and one Si(8) atom. is represented by the CIF card [CIF]
data_Al(SiO3)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.563
_cell_length_b   9.579
_cell_length_c   9.714
_cell_angle_alpha   94.478
_cell_angle_beta   95.048
_cell_angle_gamma   94.633
_symmetry_Int_Tables_number   1
_cell_volume   880.263
_cell_formula_units_Z   4
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
  Al  Al0  1  0.114  0.873  0.340  1.0
  Al  Al1  1  0.875  0.341  0.110  1.0
  Al  Al2  1  0.335  0.109  0.878  1.0
  Al  Al3  1  0.894  0.124  0.663  1.0
  Si  Si4  1  0.339  0.874  0.106  1.0
  Si  Si5  1  0.872  0.102  0.332  1.0
  Si  Si6  1  0.106  0.343  0.877  1.0
  Si  Si7  1  0.665  0.121  0.894  1.0
  Si  Si8  1  0.124  0.669  0.901  1.0
  Si  Si9  1  0.124  0.886  0.669  1.0
  Si  Si10  1  0.664  0.896  0.119  1.0
  Si  Si11  1  0.892  0.671  0.118  1.0
  O  O12  1  0.021  0.340  0.014  1.0
  O  O13  1  0.335  0.014  0.024  1.0
  O  O14  1  0.014  0.019  0.336  1.0
  O  O15  1  0.980  0.673  0.980  1.0
  O  O16  1  0.663  0.980  0.981  1.0
  O  O17  1  0.986  0.973  0.667  1.0
  O  O18  1  0.738  0.997  0.253  1.0
  O  O19  1  0.255  0.993  0.740  1.0
  O  O20  1  0.003  0.269  0.744  1.0
  O  O21  1  0.993  0.741  0.252  1.0
  O  O22  1  0.260  0.740  0.003  1.0
  O  O23  1  0.739  0.254  0.996  1.0
  O  O24  1  0.838  0.514  0.148  1.0
  O  O25  1  0.151  0.508  0.852  1.0
  O  O26  1  0.508  0.154  0.843  1.0
  O  O27  1  0.504  0.841  0.144  1.0
  O  O28  1  0.150  0.834  0.511  1.0
  O  O29  1  0.839  0.142  0.490  1.0
  O  O30  1  0.262  0.891  0.247  1.0
  O  O31  1  0.894  0.242  0.252  1.0
  O  O32  1  0.245  0.259  0.893  1.0
  O  O33  1  0.756  0.097  0.764  1.0
  O  O34  1  0.103  0.753  0.763  1.0
  O  O35  1  0.757  0.763  0.093  1.0
[/CIF]
.
The structure described by Al(SiO3)2 is Low Tridymite-derived structured and crystallizes in the triclinic P1 space group. There are four inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(10), one O(17), one O(19), and one O(3) atom to form AlO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(6)O4 tetrahedra, and  a cornercorner with one Si(8)O4 tetrahedra. In the second Al site, Al(2) is bonded to one O(1), one O(12), one O(13), and one O(20) atom to form AlO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, and  a cornercorner with one Si(8)O4 tetrahedra. In the third Al site, Al(3) is bonded to one O(15), one O(2), one O(21), and one O(8) atom to form AlO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, and  a cornercorner with one Si(6)O4 tetrahedra. In the fourth Al site, Al(4) is bonded to one O(18), one O(22), one O(6), and one O(9) atom to form AlO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, and  a cornercorner with one Si(6)O4 tetrahedra. There are eight inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(11), one O(16), one O(19), and one O(2) atom to form SiO4 tetrahedra that share  a cornercorner with one Al(1)O4 tetrahedra,  a cornercorner with one Al(3)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra, and  a cornercorner with one Si(7)O4 tetrahedra. In the second Si site, Si(2) is bonded to one O(18), one O(20), one O(3), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Al(1)O4 tetrahedra,  a cornercorner with one Al(2)O4 tetrahedra,  a cornercorner with one Al(4)O4 tetrahedra, and  a cornercorner with one Si(7)O4 tetrahedra. In the third Si site, Si(3) is bonded to one O(1), one O(14), one O(21), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Al(2)O4 tetrahedra,  a cornercorner with one Al(3)O4 tetrahedra,  a cornercorner with one Al(4)O4 tetrahedra, and  a cornercorner with one Si(5)O4 tetrahedra. In the fourth Si site, Si(4) is bonded to one O(12), one O(15), one O(22), and one O(5) atom to form SiO4 tetrahedra that share  a cornercorner with one Al(2)O4 tetrahedra,  a cornercorner with one Al(3)O4 tetrahedra,  a cornercorner with one Al(4)O4 tetrahedra, and  a cornercorner with one Si(7)O4 tetrahedra. In the fifth Si site, Si(5) is bonded to one O(11), one O(14), one O(23), and one O(4) atom to form corner-sharing SiO4 tetrahedra. In the sixth Si site, Si(6) is bonded to one O(17), one O(23), 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 Al(3)O4 tetrahedra,  a cornercorner with one Al(4)O4 tetrahedra, and  a cornercorner with one Si(5)O4 tetrahedra. In the seventh Si site, Si(7) is bonded to one O(16), one O(24), one O(5), and one O(7) atom to form corner-sharing SiO4 tetrahedra. In the eighth Si site, Si(8) is bonded to one O(10), one O(13), one O(24), and one O(4) atom to form SiO4 tetrahedra that share  a cornercorner with one Al(1)O4 tetrahedra,  a cornercorner with one Al(2)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra, and  a cornercorner with one Si(7)O4 tetrahedra. There are twenty-four inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Al(2) and one Si(3) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Al(3) and one Si(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Al(1) and one Si(2) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Si(5) and one Si(8) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Si(4) and one Si(7) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Al(4) and one Si(6) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one Si(2) and one Si(7) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one Al(3) and one Si(6) atom. In the ninth O site, O(9) is bonded in a bent 150 degrees geometry to one Al(4) and one Si(3) atom. In the tenth O site, O(10) is bonded in a bent 150 degrees geometry to one Al(1) and one Si(8) atom. In the eleventh O site, O(11) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(5) atom. In the twelfth O site, O(12) is bonded in a bent 150 degrees geometry to one Al(2) and one Si(4) atom. In the thirteenth O site, O(13) is bonded in a bent 150 degrees geometry to one Al(2) and one Si(8) atom. In the fourteenth O site, O(14) is bonded in a bent 150 degrees geometry to one Si(3) and one Si(5) atom. In the fifteenth O site, O(15) is bonded in a bent 150 degrees geometry to one Al(3) and one Si(4) atom. In the sixteenth O site, O(16) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(7) atom. In the seventeenth O site, O(17) is bonded in a bent 150 degrees geometry to one Al(1) and one Si(6) atom. In the eighteenth O site, O(18) is bonded in a bent 150 degrees geometry to one Al(4) and one Si(2) atom. In the nineteenth O site, O(19) is bonded in a bent 150 degrees geometry to one Al(1) and one Si(1) atom. In the twentieth O site, O(20) is bonded in a bent 150 degrees geometry to one Al(2) and one Si(2) atom. In the twenty-first O site, O(21) is bonded in a bent 150 degrees geometry to one Al(3) and one Si(3) atom. In the twenty-second O site, O(22) is bonded in a bent 150 degrees geometry to one Al(4) and one Si(4) atom. In the twenty-third O site, O(23) is bonded in a bent 150 degrees geometry to one Si(5) and one Si(6) atom. In the twenty-fourth O site, O(24) is bonded in a bent 150 degrees geometry to one Si(7) and one Si(8) atom. is represented by the CIF card [CIF]
data_Al(SiO3)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.563
_cell_length_b   9.579
_cell_length_c   9.714
_cell_angle_alpha   94.478
_cell_angle_beta   95.048
_cell_angle_gamma   94.633
_symmetry_Int_Tables_number   1
_cell_volume   880.263
_cell_formula_units_Z   4
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
  Al  Al0  1  0.114  0.873  0.340  1.0
  Al  Al1  1  0.875  0.341  0.110  1.0
  Al  Al2  1  0.335  0.109  0.878  1.0
  Al  Al3  1  0.894  0.124  0.663  1.0
  Si  Si4  1  0.339  0.874  0.106  1.0
  Si  Si5  1  0.872  0.102  0.332  1.0
  Si  Si6  1  0.106  0.343  0.877  1.0
  Si  Si7  1  0.665  0.121  0.894  1.0
  Si  Si8  1  0.124  0.669  0.901  1.0
  Si  Si9  1  0.124  0.886  0.669  1.0
  Si  Si10  1  0.664  0.896  0.119  1.0
  Si  Si11  1  0.892  0.671  0.118  1.0
  O  O12  1  0.021  0.340  0.014  1.0
  O  O13  1  0.335  0.014  0.024  1.0
  O  O14  1  0.014  0.019  0.336  1.0
  O  O15  1  0.980  0.673  0.980  1.0
  O  O16  1  0.663  0.980  0.981  1.0
  O  O17  1  0.986  0.973  0.667  1.0
  O  O18  1  0.738  0.997  0.253  1.0
  O  O19  1  0.255  0.993  0.740  1.0
  O  O20  1  0.003  0.269  0.744  1.0
  O  O21  1  0.993  0.741  0.252  1.0
  O  O22  1  0.260  0.740  0.003  1.0
  O  O23  1  0.739  0.254  0.996  1.0
  O  O24  1  0.838  0.514  0.148  1.0
  O  O25  1  0.151  0.508  0.852  1.0
  O  O26  1  0.508  0.154  0.843  1.0
  O  O27  1  0.504  0.841  0.144  1.0
  O  O28  1  0.150  0.834  0.511  1.0
  O  O29  1  0.839  0.142  0.490  1.0
  O  O30  1  0.262  0.891  0.247  1.0
  O  O31  1  0.894  0.242  0.252  1.0
  O  O32  1  0.245  0.259  0.893  1.0
  O  O33  1  0.756  0.097  0.764  1.0
  O  O34  1  0.103  0.753  0.763  1.0
  O  O35  1  0.757  0.763  0.093  1.0
[/CIF]
.