The material described by Al2(SeO4)3 crystallizes in the trigonal R3c space group. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in an octahedral geometry to three equivalent O(1) and three equivalent O(3) atoms. In the second Al site, Al(2) is bonded in an octahedral geometry to three equivalent O(2) and three equivalent O(4) atoms. Se(1) is bonded in a distorted trigonal non-coplanar geometry to one O(1), one O(2), and one O(3) atom. There are four inequivalent O sites. In the first O site, O(2) is bonded in a bent 120 degrees geometry to one Al(2) and one Se(1) atom. In the second O site, O(3) is bonded in a bent 120 degrees geometry to one Al(1) and one Se(1) atom. In the third O site, O(4) is bonded in a single-bond geometry to one Al(2) atom. In the fourth O site, O(1) is bonded in a bent 120 degrees geometry to one Al(1) and one Se(1) atom. is represented by the CIF card [CIF]
data_Al2(SeO4)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.506
_cell_length_b   8.506
_cell_length_c   8.506
_cell_angle_alpha   65.948
_cell_angle_beta   65.948
_cell_angle_gamma   65.948
_symmetry_Int_Tables_number   1
_cell_volume   491.248
_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
  Al  Al0  1  0.295  0.295  0.295  1.0
  Al  Al1  1  0.795  0.795  0.795  1.0
  Al  Al2  1  0.064  0.064  0.064  1.0
  Al  Al3  1  0.564  0.564  0.564  1.0
  Se  Se4  1  0.574  0.493  0.964  1.0
  Se  Se5  1  0.464  0.993  0.074  1.0
  Se  Se6  1  0.964  0.574  0.493  1.0
  Se  Se7  1  0.074  0.464  0.993  1.0
  Se  Se8  1  0.493  0.964  0.574  1.0
  Se  Se9  1  0.993  0.074  0.464  1.0
  O  O10  1  0.661  0.983  0.907  1.0
  O  O11  1  0.407  0.483  0.161  1.0
  O  O12  1  0.907  0.661  0.983  1.0
  O  O13  1  0.161  0.407  0.483  1.0
  O  O14  1  0.983  0.907  0.661  1.0
  O  O15  1  0.483  0.161  0.407  1.0
  O  O16  1  0.304  0.063  0.957  1.0
  O  O17  1  0.457  0.563  0.804  1.0
  O  O18  1  0.957  0.304  0.063  1.0
  O  O19  1  0.804  0.457  0.563  1.0
  O  O20  1  0.063  0.957  0.304  1.0
  O  O21  1  0.563  0.804  0.457  1.0
  O  O22  1  0.096  0.431  0.197  1.0
  O  O23  1  0.697  0.931  0.596  1.0
  O  O24  1  0.197  0.096  0.431  1.0
  O  O25  1  0.596  0.697  0.931  1.0
  O  O26  1  0.431  0.197  0.096  1.0
  O  O27  1  0.931  0.596  0.697  1.0
  O  O28  1  0.034  0.132  0.835  1.0
  O  O29  1  0.335  0.632  0.534  1.0
  O  O30  1  0.835  0.034  0.132  1.0
  O  O31  1  0.534  0.335  0.632  1.0
  O  O32  1  0.132  0.835  0.034  1.0
  O  O33  1  0.632  0.534  0.335  1.0
[/CIF]
.
The material described by Al2(SeO4)3 crystallizes in the trigonal R3c space group. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in an octahedral geometry to three equivalent O(1) and three equivalent O(3) atoms. In the second Al site, Al(2) is bonded in an octahedral geometry to three equivalent O(2) and three equivalent O(4) atoms. Se(1) is bonded in a distorted trigonal non-coplanar geometry to one O(1), one O(2), and one O(3) atom. There are four inequivalent O sites. In the first O site, O(2) is bonded in a bent 120 degrees geometry to one Al(2) and one Se(1) atom. In the second O site, O(3) is bonded in a bent 120 degrees geometry to one Al(1) and one Se(1) atom. In the third O site, O(4) is bonded in a single-bond geometry to one Al(2) atom. In the fourth O site, O(1) is bonded in a bent 120 degrees geometry to one Al(1) and one Se(1) atom. is represented by the CIF card [CIF]
data_Al2(SeO4)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.506
_cell_length_b   8.506
_cell_length_c   8.506
_cell_angle_alpha   65.948
_cell_angle_beta   65.948
_cell_angle_gamma   65.948
_symmetry_Int_Tables_number   1
_cell_volume   491.248
_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
  Al  Al0  1  0.295  0.295  0.295  1.0
  Al  Al1  1  0.795  0.795  0.795  1.0
  Al  Al2  1  0.064  0.064  0.064  1.0
  Al  Al3  1  0.564  0.564  0.564  1.0
  Se  Se4  1  0.574  0.493  0.964  1.0
  Se  Se5  1  0.464  0.993  0.074  1.0
  Se  Se6  1  0.964  0.574  0.493  1.0
  Se  Se7  1  0.074  0.464  0.993  1.0
  Se  Se8  1  0.493  0.964  0.574  1.0
  Se  Se9  1  0.993  0.074  0.464  1.0
  O  O10  1  0.661  0.983  0.907  1.0
  O  O11  1  0.407  0.483  0.161  1.0
  O  O12  1  0.907  0.661  0.983  1.0
  O  O13  1  0.161  0.407  0.483  1.0
  O  O14  1  0.983  0.907  0.661  1.0
  O  O15  1  0.483  0.161  0.407  1.0
  O  O16  1  0.304  0.063  0.957  1.0
  O  O17  1  0.457  0.563  0.804  1.0
  O  O18  1  0.957  0.304  0.063  1.0
  O  O19  1  0.804  0.457  0.563  1.0
  O  O20  1  0.063  0.957  0.304  1.0
  O  O21  1  0.563  0.804  0.457  1.0
  O  O22  1  0.096  0.431  0.197  1.0
  O  O23  1  0.697  0.931  0.596  1.0
  O  O24  1  0.197  0.096  0.431  1.0
  O  O25  1  0.596  0.697  0.931  1.0
  O  O26  1  0.431  0.197  0.096  1.0
  O  O27  1  0.931  0.596  0.697  1.0
  O  O28  1  0.034  0.132  0.835  1.0
  O  O29  1  0.335  0.632  0.534  1.0
  O  O30  1  0.835  0.034  0.132  1.0
  O  O31  1  0.534  0.335  0.632  1.0
  O  O32  1  0.132  0.835  0.034  1.0
  O  O33  1  0.632  0.534  0.335  1.0
[/CIF]
.