The material described by Rb2Na2Al3(SiO4)3 crystallizes in the orthorhombic Pmn2_1 space group. Rb(1) is bonded in a 4-coordinate geometry to one O(6), one O(7), and two equivalent O(5) atoms. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 7-coordinate geometry to one O(1), two equivalent O(4), two equivalent O(6), and two equivalent O(7) atoms. In the second Na site, Na(2) is bonded in a 7-coordinate geometry to one O(3), two equivalent O(2), two equivalent O(4), and two equivalent O(6) atoms. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(2), one O(4), one O(5), and one O(6) atom to form AlO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra and corners with three equivalent Si(2)O4 tetrahedra. In the second Al site, Al(2) is bonded to one O(1), one O(3), and two equivalent O(7) atoms to form AlO4 tetrahedra that share corners with two equivalent Si(1)O4 tetrahedra and corners with two equivalent Si(2)O4 tetrahedra. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(3), and two equivalent O(2) atoms to form SiO4 tetrahedra that share corners with two equivalent Al(1)O4 tetrahedra and corners with two equivalent Al(2)O4 tetrahedra. In the second Si site, Si(2) is bonded to one O(4), one O(5), one O(6), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Al(2)O4 tetrahedra and corners with three equivalent Al(1)O4 tetrahedra. There are seven inequivalent O sites. In the first O site, O(5) is bonded in a distorted bent 150 degrees geometry to two equivalent Rb(1), one Al(1), and one Si(2) atom. In the second O site, O(6) is bonded in a 3-coordinate geometry to one Rb(1), one Na(1), one Na(2), one Al(1), and one Si(2) atom. In the third O site, O(7) is bonded in a distorted bent 150 degrees geometry to one Rb(1), one Na(1), one Al(2), 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(2), and one Si(1) atom. In the fifth O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Na(2), one Al(1), and one Si(1) atom. In the sixth O site, O(3) is bonded in a distorted trigonal planar geometry to one Na(2), one Al(2), and one Si(1) atom. In the seventh O site, O(4) is bonded in a 4-coordinate geometry to one Na(1), one Na(2), one Al(1), and one Si(2) atom. is represented by the CIF file [CIF]
data_Rb2Na2Al3(SiO4)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.293
_cell_length_b   8.335
_cell_length_c   15.501
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   683.859
_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  0.830  0.346  0.786  1.0
  Rb  Rb1  1  0.330  0.654  0.714  1.0
  Rb  Rb2  1  0.330  0.654  0.286  1.0
  Rb  Rb3  1  0.830  0.346  0.214  1.0
  Na  Na4  1  0.805  0.172  0.000  1.0
  Na  Na5  1  0.305  0.828  0.500  1.0
  Na  Na6  1  0.316  0.827  0.000  1.0
  Na  Na7  1  0.816  0.173  0.500  1.0
  Al  Al8  1  0.843  0.894  0.855  1.0
  Al  Al9  1  0.343  0.106  0.645  1.0
  Al  Al10  1  0.343  0.106  0.355  1.0
  Al  Al11  1  0.843  0.894  0.145  1.0
  Al  Al12  1  0.337  0.401  0.000  1.0
  Al  Al13  1  0.837  0.599  0.500  1.0
  Si  Si14  1  0.841  0.615  0.000  1.0
  Si  Si15  1  0.341  0.385  0.500  1.0
  Si  Si16  1  0.842  0.890  0.642  1.0
  Si  Si17  1  0.342  0.110  0.858  1.0
  Si  Si18  1  0.342  0.110  0.142  1.0
  Si  Si19  1  0.842  0.890  0.358  1.0
  O  O20  1  0.008  0.447  0.000  1.0
  O  O21  1  0.508  0.553  0.500  1.0
  O  O22  1  0.920  0.722  0.915  1.0
  O  O23  1  0.420  0.278  0.585  1.0
  O  O24  1  0.420  0.278  0.415  1.0
  O  O25  1  0.920  0.722  0.085  1.0
  O  O26  1  0.537  0.571  0.000  1.0
  O  O27  1  0.037  0.429  0.500  1.0
  O  O28  1  0.544  0.970  0.887  1.0
  O  O29  1  0.044  0.030  0.613  1.0
  O  O30  1  0.044  0.030  0.387  1.0
  O  O31  1  0.544  0.970  0.113  1.0
  O  O32  1  0.862  0.848  0.745  1.0
  O  O33  1  0.362  0.152  0.755  1.0
  O  O34  1  0.362  0.152  0.245  1.0
  O  O35  1  0.862  0.848  0.255  1.0
  O  O36  1  0.555  0.948  0.615  1.0
  O  O37  1  0.055  0.052  0.885  1.0
  O  O38  1  0.055  0.052  0.115  1.0
  O  O39  1  0.555  0.948  0.385  1.0
  O  O40  1  0.914  0.724  0.590  1.0
  O  O41  1  0.414  0.276  0.910  1.0
  O  O42  1  0.414  0.276  0.090  1.0
  O  O43  1  0.914  0.724  0.410  1.0
[/CIF]
.
The material described by Rb2Na2Al3(SiO4)3 crystallizes in the orthorhombic Pmn2_1 space group. Rb(1) is bonded in a 4-coordinate geometry to one O(6), one O(7), and two equivalent O(5) atoms. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 7-coordinate geometry to one O(1), two equivalent O(4), two equivalent O(6), and two equivalent O(7) atoms. In the second Na site, Na(2) is bonded in a 7-coordinate geometry to one O(3), two equivalent O(2), two equivalent O(4), and two equivalent O(6) atoms. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(2), one O(4), one O(5), and one O(6) atom to form AlO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra and corners with three equivalent Si(2)O4 tetrahedra. In the second Al site, Al(2) is bonded to one O(1), one O(3), and two equivalent O(7) atoms to form AlO4 tetrahedra that share corners with two equivalent Si(1)O4 tetrahedra and corners with two equivalent Si(2)O4 tetrahedra. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(3), and two equivalent O(2) atoms to form SiO4 tetrahedra that share corners with two equivalent Al(1)O4 tetrahedra and corners with two equivalent Al(2)O4 tetrahedra. In the second Si site, Si(2) is bonded to one O(4), one O(5), one O(6), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Al(2)O4 tetrahedra and corners with three equivalent Al(1)O4 tetrahedra. There are seven inequivalent O sites. In the first O site, O(5) is bonded in a distorted bent 150 degrees geometry to two equivalent Rb(1), one Al(1), and one Si(2) atom. In the second O site, O(6) is bonded in a 3-coordinate geometry to one Rb(1), one Na(1), one Na(2), one Al(1), and one Si(2) atom. In the third O site, O(7) is bonded in a distorted bent 150 degrees geometry to one Rb(1), one Na(1), one Al(2), 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(2), and one Si(1) atom. In the fifth O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Na(2), one Al(1), and one Si(1) atom. In the sixth O site, O(3) is bonded in a distorted trigonal planar geometry to one Na(2), one Al(2), and one Si(1) atom. In the seventh O site, O(4) is bonded in a 4-coordinate geometry to one Na(1), one Na(2), one Al(1), and one Si(2) atom. is represented by the CIF file [CIF]
data_Rb2Na2Al3(SiO4)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.293
_cell_length_b   8.335
_cell_length_c   15.501
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   683.859
_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  0.830  0.346  0.786  1.0
  Rb  Rb1  1  0.330  0.654  0.714  1.0
  Rb  Rb2  1  0.330  0.654  0.286  1.0
  Rb  Rb3  1  0.830  0.346  0.214  1.0
  Na  Na4  1  0.805  0.172  0.000  1.0
  Na  Na5  1  0.305  0.828  0.500  1.0
  Na  Na6  1  0.316  0.827  0.000  1.0
  Na  Na7  1  0.816  0.173  0.500  1.0
  Al  Al8  1  0.843  0.894  0.855  1.0
  Al  Al9  1  0.343  0.106  0.645  1.0
  Al  Al10  1  0.343  0.106  0.355  1.0
  Al  Al11  1  0.843  0.894  0.145  1.0
  Al  Al12  1  0.337  0.401  0.000  1.0
  Al  Al13  1  0.837  0.599  0.500  1.0
  Si  Si14  1  0.841  0.615  0.000  1.0
  Si  Si15  1  0.341  0.385  0.500  1.0
  Si  Si16  1  0.842  0.890  0.642  1.0
  Si  Si17  1  0.342  0.110  0.858  1.0
  Si  Si18  1  0.342  0.110  0.142  1.0
  Si  Si19  1  0.842  0.890  0.358  1.0
  O  O20  1  0.008  0.447  0.000  1.0
  O  O21  1  0.508  0.553  0.500  1.0
  O  O22  1  0.920  0.722  0.915  1.0
  O  O23  1  0.420  0.278  0.585  1.0
  O  O24  1  0.420  0.278  0.415  1.0
  O  O25  1  0.920  0.722  0.085  1.0
  O  O26  1  0.537  0.571  0.000  1.0
  O  O27  1  0.037  0.429  0.500  1.0
  O  O28  1  0.544  0.970  0.887  1.0
  O  O29  1  0.044  0.030  0.613  1.0
  O  O30  1  0.044  0.030  0.387  1.0
  O  O31  1  0.544  0.970  0.113  1.0
  O  O32  1  0.862  0.848  0.745  1.0
  O  O33  1  0.362  0.152  0.755  1.0
  O  O34  1  0.362  0.152  0.245  1.0
  O  O35  1  0.862  0.848  0.255  1.0
  O  O36  1  0.555  0.948  0.615  1.0
  O  O37  1  0.055  0.052  0.885  1.0
  O  O38  1  0.055  0.052  0.115  1.0
  O  O39  1  0.555  0.948  0.385  1.0
  O  O40  1  0.914  0.724  0.590  1.0
  O  O41  1  0.414  0.276  0.910  1.0
  O  O42  1  0.414  0.276  0.090  1.0
  O  O43  1  0.914  0.724  0.410  1.0
[/CIF]
.