The crystal structure described by Rb3Al2(PO4)3 crystallizes in the orthorhombic Cmc2_1 space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 9-coordinate geometry to one O(1), one O(4), one O(6), two equivalent O(2), two equivalent O(5), and two equivalent O(7) atoms. In the second Rb site, Rb(2) is bonded to one O(6), two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form distorted RbO7 pentagonal bipyramids that share  a cornercorner with one P(2)O4 tetrahedra, corners with four equivalent Al(1)O4 tetrahedra,  an edgeedge with one P(2)O4 tetrahedra, and edges with two equivalent P(1)O4 tetrahedra. 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 corners with two equivalent Rb(2)O7 pentagonal bipyramids,  a cornercorner with one P(2)O4 tetrahedra, and corners with three equivalent P(1)O4 tetrahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(3), one O(4), and one O(5) atom to form PO4 tetrahedra that share corners with three equivalent Al(1)O4 tetrahedra and  an edgeedge with one Rb(2)O7 pentagonal bipyramid. In the second P site, P(2) is bonded to one O(6), one O(7), and two equivalent O(1) atoms to form PO4 tetrahedra that share  a cornercorner with one Rb(2)O7 pentagonal bipyramid, corners with two equivalent Al(1)O4 tetrahedra, and  an edgeedge with one Rb(2)O7 pentagonal bipyramid. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Rb(1), one Rb(2), one Al(1), and one P(2) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Rb(2), two equivalent Rb(1), and one P(1) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Rb(2), one Al(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Rb(1), one Al(1), and one P(1) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to two equivalent Rb(1), one Al(1), and one P(1) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Rb(2), two equivalent Rb(1), and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to four equivalent Rb(1) and one P(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Rb3Al2(PO4)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.733
_cell_length_b   9.733
_cell_length_c   8.957
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   126.391
_symmetry_Int_Tables_number   1
_cell_volume   683.027
_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
  Rb  Rb0  1  0.162  0.932  0.474  1.0
  Rb  Rb1  1  0.068  0.838  0.974  1.0
  Rb  Rb2  1  0.357  0.357  0.178  1.0
  Rb  Rb3  1  0.932  0.162  0.474  1.0
  Rb  Rb4  1  0.838  0.068  0.974  1.0
  Rb  Rb5  1  0.643  0.643  0.678  1.0
  Al  Al6  1  0.179  0.514  0.819  1.0
  Al  Al7  1  0.486  0.821  0.319  1.0
  Al  Al8  1  0.821  0.486  0.319  1.0
  Al  Al9  1  0.514  0.179  0.819  1.0
  P  P10  1  0.466  0.876  0.659  1.0
  P  P11  1  0.766  0.766  0.253  1.0
  P  P12  1  0.234  0.234  0.753  1.0
  P  P13  1  0.534  0.124  0.159  1.0
  P  P14  1  0.876  0.466  0.659  1.0
  P  P15  1  0.124  0.534  0.159  1.0
  O  O16  1  0.633  0.775  0.350  1.0
  O  O17  1  0.652  0.956  0.688  1.0
  O  O18  1  0.306  0.649  0.229  1.0
  O  O19  1  0.148  0.581  0.990  1.0
  O  O20  1  0.593  0.016  0.220  1.0
  O  O21  1  0.016  0.593  0.220  1.0
  O  O22  1  0.367  0.225  0.850  1.0
  O  O23  1  0.305  0.305  0.598  1.0
  O  O24  1  0.225  0.367  0.850  1.0
  O  O25  1  0.775  0.633  0.350  1.0
  O  O26  1  0.852  0.419  0.490  1.0
  O  O27  1  0.694  0.351  0.729  1.0
  O  O28  1  0.044  0.348  0.188  1.0
  O  O29  1  0.061  0.061  0.756  1.0
  O  O30  1  0.649  0.306  0.229  1.0
  O  O31  1  0.695  0.695  0.098  1.0
  O  O32  1  0.407  0.984  0.720  1.0
  O  O33  1  0.939  0.939  0.256  1.0
  O  O34  1  0.984  0.407  0.720  1.0
  O  O35  1  0.581  0.148  0.990  1.0
  O  O36  1  0.419  0.852  0.490  1.0
  O  O37  1  0.956  0.652  0.688  1.0
  O  O38  1  0.348  0.044  0.188  1.0
  O  O39  1  0.351  0.694  0.729  1.0
[/CIF]
.
The crystal structure described by Rb3Al2(PO4)3 crystallizes in the orthorhombic Cmc2_1 space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 9-coordinate geometry to one O(1), one O(4), one O(6), two equivalent O(2), two equivalent O(5), and two equivalent O(7) atoms. In the second Rb site, Rb(2) is bonded to one O(6), two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form distorted RbO7 pentagonal bipyramids that share  a cornercorner with one P(2)O4 tetrahedra, corners with four equivalent Al(1)O4 tetrahedra,  an edgeedge with one P(2)O4 tetrahedra, and edges with two equivalent P(1)O4 tetrahedra. 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 corners with two equivalent Rb(2)O7 pentagonal bipyramids,  a cornercorner with one P(2)O4 tetrahedra, and corners with three equivalent P(1)O4 tetrahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(3), one O(4), and one O(5) atom to form PO4 tetrahedra that share corners with three equivalent Al(1)O4 tetrahedra and  an edgeedge with one Rb(2)O7 pentagonal bipyramid. In the second P site, P(2) is bonded to one O(6), one O(7), and two equivalent O(1) atoms to form PO4 tetrahedra that share  a cornercorner with one Rb(2)O7 pentagonal bipyramid, corners with two equivalent Al(1)O4 tetrahedra, and  an edgeedge with one Rb(2)O7 pentagonal bipyramid. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Rb(1), one Rb(2), one Al(1), and one P(2) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Rb(2), two equivalent Rb(1), and one P(1) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Rb(2), one Al(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Rb(1), one Al(1), and one P(1) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to two equivalent Rb(1), one Al(1), and one P(1) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Rb(2), two equivalent Rb(1), and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to four equivalent Rb(1) and one P(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Rb3Al2(PO4)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.733
_cell_length_b   9.733
_cell_length_c   8.957
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   126.391
_symmetry_Int_Tables_number   1
_cell_volume   683.027
_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
  Rb  Rb0  1  0.162  0.932  0.474  1.0
  Rb  Rb1  1  0.068  0.838  0.974  1.0
  Rb  Rb2  1  0.357  0.357  0.178  1.0
  Rb  Rb3  1  0.932  0.162  0.474  1.0
  Rb  Rb4  1  0.838  0.068  0.974  1.0
  Rb  Rb5  1  0.643  0.643  0.678  1.0
  Al  Al6  1  0.179  0.514  0.819  1.0
  Al  Al7  1  0.486  0.821  0.319  1.0
  Al  Al8  1  0.821  0.486  0.319  1.0
  Al  Al9  1  0.514  0.179  0.819  1.0
  P  P10  1  0.466  0.876  0.659  1.0
  P  P11  1  0.766  0.766  0.253  1.0
  P  P12  1  0.234  0.234  0.753  1.0
  P  P13  1  0.534  0.124  0.159  1.0
  P  P14  1  0.876  0.466  0.659  1.0
  P  P15  1  0.124  0.534  0.159  1.0
  O  O16  1  0.633  0.775  0.350  1.0
  O  O17  1  0.652  0.956  0.688  1.0
  O  O18  1  0.306  0.649  0.229  1.0
  O  O19  1  0.148  0.581  0.990  1.0
  O  O20  1  0.593  0.016  0.220  1.0
  O  O21  1  0.016  0.593  0.220  1.0
  O  O22  1  0.367  0.225  0.850  1.0
  O  O23  1  0.305  0.305  0.598  1.0
  O  O24  1  0.225  0.367  0.850  1.0
  O  O25  1  0.775  0.633  0.350  1.0
  O  O26  1  0.852  0.419  0.490  1.0
  O  O27  1  0.694  0.351  0.729  1.0
  O  O28  1  0.044  0.348  0.188  1.0
  O  O29  1  0.061  0.061  0.756  1.0
  O  O30  1  0.649  0.306  0.229  1.0
  O  O31  1  0.695  0.695  0.098  1.0
  O  O32  1  0.407  0.984  0.720  1.0
  O  O33  1  0.939  0.939  0.256  1.0
  O  O34  1  0.984  0.407  0.720  1.0
  O  O35  1  0.581  0.148  0.990  1.0
  O  O36  1  0.419  0.852  0.490  1.0
  O  O37  1  0.956  0.652  0.688  1.0
  O  O38  1  0.348  0.044  0.188  1.0
  O  O39  1  0.351  0.694  0.729  1.0
[/CIF]
.