The crystal structure described by Rb2NaAl3F12 crystallizes in the monoclinic P2_1/m space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 7-coordinate geometry to one F(4), two equivalent F(5), and four equivalent F(7) atoms. In the second Rb site, Rb(2) is bonded in a 8-coordinate geometry to one F(2), one F(3), two equivalent F(5), two equivalent F(6), and two equivalent F(8) atoms. Na(1) is bonded to one F(2), one F(4), two equivalent F(5), and two equivalent F(7) atoms to form distorted NaF6 octahedra that share corners with two equivalent Al(1)F6 octahedra, corners with two equivalent Al(2)F6 octahedra, and corners with two equivalent Al(3)F6 octahedra. The corner-sharing octahedral tilt angles range from 50-65°. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded to two equivalent F(1), two equivalent F(5), and two equivalent F(6) atoms to form AlF6 octahedra that share corners with two equivalent Na(1)F6 octahedra, corners with two equivalent Al(1)F6 octahedra, and corners with two equivalent Al(3)F6 octahedra. The corner-sharing octahedral tilt angles range from 35-65°. In the second Al site, Al(2) is bonded to two equivalent F(3), two equivalent F(7), and two equivalent F(8) atoms to form AlF6 octahedra that share corners with two equivalent Na(1)F6 octahedra, corners with two equivalent Al(2)F6 octahedra, and corners with two equivalent Al(3)F6 octahedra. The corner-sharing octahedral tilt angles range from 34-56°. In the third Al site, Al(3) is bonded to one F(2), one F(4), two equivalent F(6), and two equivalent F(8) atoms to form AlF6 octahedra that share corners with two equivalent Na(1)F6 octahedra, corners with two equivalent Al(1)F6 octahedra, and corners with two equivalent Al(2)F6 octahedra. The corner-sharing octahedral tilt angles range from 34-60°. There are eight inequivalent F sites. In the first F site, F(8) is bonded in a bent 150 degrees geometry to one Rb(2), one Al(2), and one Al(3) atom. In the second F site, F(1) is bonded in a bent 150 degrees geometry to two equivalent Al(1) atoms. In the third F site, F(2) is bonded in a distorted trigonal planar geometry to one Rb(2), one Na(1), and one Al(3) atom. In the fourth F site, F(3) is bonded in a distorted bent 150 degrees geometry to one Rb(2) and two equivalent Al(2) atoms. In the fifth F site, F(4) is bonded in a 2-coordinate geometry to one Rb(1), one Na(1), and one Al(3) atom. In the sixth F site, F(5) is bonded in a 4-coordinate geometry to one Rb(1), one Rb(2), one Na(1), and one Al(1) atom. In the seventh F site, F(6) is bonded in a bent 150 degrees geometry to one Rb(2), one Al(1), and one Al(3) atom. In the eighth F site, F(7) is bonded in a 4-coordinate geometry to two equivalent Rb(1), one Na(1), and one Al(2) atom. is represented by the CIF file [CIF]
data_Rb2NaAl3F12
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.107
_cell_length_b   7.207
_cell_length_c   10.029
_cell_angle_alpha   88.957
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   513.616
_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  0.750  0.004  0.117  1.0
  Rb  Rb1  1  0.250  0.996  0.883  1.0
  Rb  Rb2  1  0.250  0.480  0.638  1.0
  Rb  Rb3  1  0.750  0.520  0.362  1.0
  Na  Na4  1  0.750  0.219  0.755  1.0
  Na  Na5  1  0.250  0.781  0.245  1.0
  Al  Al6  1  0.500  0.000  0.500  1.0
  Al  Al7  1  0.000  0.000  0.500  1.0
  Al  Al8  1  0.000  0.500  0.000  1.0
  Al  Al9  1  0.500  0.500  0.000  1.0
  Al  Al10  1  0.750  0.711  0.729  1.0
  Al  Al11  1  0.250  0.289  0.271  1.0
  F  F12  1  0.750  0.077  0.490  1.0
  F  F13  1  0.250  0.923  0.510  1.0
  F  F14  1  0.750  0.500  0.639  1.0
  F  F15  1  0.250  0.500  0.361  1.0
  F  F16  1  0.250  0.493  0.944  1.0
  F  F17  1  0.750  0.507  0.056  1.0
  F  F18  1  0.250  0.085  0.177  1.0
  F  F19  1  0.750  0.915  0.823  1.0
  F  F20  1  0.969  0.855  0.361  1.0
  F  F21  1  0.469  0.145  0.639  1.0
  F  F22  1  0.031  0.145  0.639  1.0
  F  F23  1  0.531  0.855  0.361  1.0
  F  F24  1  0.937  0.802  0.615  1.0
  F  F25  1  0.437  0.198  0.385  1.0
  F  F26  1  0.063  0.198  0.385  1.0
  F  F27  1  0.563  0.802  0.615  1.0
  F  F28  1  0.036  0.722  0.069  1.0
  F  F29  1  0.536  0.278  0.931  1.0
  F  F30  1  0.964  0.278  0.931  1.0
  F  F31  1  0.464  0.722  0.069  1.0
  F  F32  1  0.440  0.388  0.163  1.0
  F  F33  1  0.940  0.612  0.837  1.0
  F  F34  1  0.560  0.612  0.837  1.0
  F  F35  1  0.060  0.388  0.163  1.0
[/CIF]
.
The crystal structure described by Rb2NaAl3F12 crystallizes in the monoclinic P2_1/m space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 7-coordinate geometry to one F(4), two equivalent F(5), and four equivalent F(7) atoms. In the second Rb site, Rb(2) is bonded in a 8-coordinate geometry to one F(2), one F(3), two equivalent F(5), two equivalent F(6), and two equivalent F(8) atoms. Na(1) is bonded to one F(2), one F(4), two equivalent F(5), and two equivalent F(7) atoms to form distorted NaF6 octahedra that share corners with two equivalent Al(1)F6 octahedra, corners with two equivalent Al(2)F6 octahedra, and corners with two equivalent Al(3)F6 octahedra. The corner-sharing octahedral tilt angles range from 50-65°. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded to two equivalent F(1), two equivalent F(5), and two equivalent F(6) atoms to form AlF6 octahedra that share corners with two equivalent Na(1)F6 octahedra, corners with two equivalent Al(1)F6 octahedra, and corners with two equivalent Al(3)F6 octahedra. The corner-sharing octahedral tilt angles range from 35-65°. In the second Al site, Al(2) is bonded to two equivalent F(3), two equivalent F(7), and two equivalent F(8) atoms to form AlF6 octahedra that share corners with two equivalent Na(1)F6 octahedra, corners with two equivalent Al(2)F6 octahedra, and corners with two equivalent Al(3)F6 octahedra. The corner-sharing octahedral tilt angles range from 34-56°. In the third Al site, Al(3) is bonded to one F(2), one F(4), two equivalent F(6), and two equivalent F(8) atoms to form AlF6 octahedra that share corners with two equivalent Na(1)F6 octahedra, corners with two equivalent Al(1)F6 octahedra, and corners with two equivalent Al(2)F6 octahedra. The corner-sharing octahedral tilt angles range from 34-60°. There are eight inequivalent F sites. In the first F site, F(8) is bonded in a bent 150 degrees geometry to one Rb(2), one Al(2), and one Al(3) atom. In the second F site, F(1) is bonded in a bent 150 degrees geometry to two equivalent Al(1) atoms. In the third F site, F(2) is bonded in a distorted trigonal planar geometry to one Rb(2), one Na(1), and one Al(3) atom. In the fourth F site, F(3) is bonded in a distorted bent 150 degrees geometry to one Rb(2) and two equivalent Al(2) atoms. In the fifth F site, F(4) is bonded in a 2-coordinate geometry to one Rb(1), one Na(1), and one Al(3) atom. In the sixth F site, F(5) is bonded in a 4-coordinate geometry to one Rb(1), one Rb(2), one Na(1), and one Al(1) atom. In the seventh F site, F(6) is bonded in a bent 150 degrees geometry to one Rb(2), one Al(1), and one Al(3) atom. In the eighth F site, F(7) is bonded in a 4-coordinate geometry to two equivalent Rb(1), one Na(1), and one Al(2) atom. is represented by the CIF file [CIF]
data_Rb2NaAl3F12
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.107
_cell_length_b   7.207
_cell_length_c   10.029
_cell_angle_alpha   88.957
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   513.616
_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  0.750  0.004  0.117  1.0
  Rb  Rb1  1  0.250  0.996  0.883  1.0
  Rb  Rb2  1  0.250  0.480  0.638  1.0
  Rb  Rb3  1  0.750  0.520  0.362  1.0
  Na  Na4  1  0.750  0.219  0.755  1.0
  Na  Na5  1  0.250  0.781  0.245  1.0
  Al  Al6  1  0.500  0.000  0.500  1.0
  Al  Al7  1  0.000  0.000  0.500  1.0
  Al  Al8  1  0.000  0.500  0.000  1.0
  Al  Al9  1  0.500  0.500  0.000  1.0
  Al  Al10  1  0.750  0.711  0.729  1.0
  Al  Al11  1  0.250  0.289  0.271  1.0
  F  F12  1  0.750  0.077  0.490  1.0
  F  F13  1  0.250  0.923  0.510  1.0
  F  F14  1  0.750  0.500  0.639  1.0
  F  F15  1  0.250  0.500  0.361  1.0
  F  F16  1  0.250  0.493  0.944  1.0
  F  F17  1  0.750  0.507  0.056  1.0
  F  F18  1  0.250  0.085  0.177  1.0
  F  F19  1  0.750  0.915  0.823  1.0
  F  F20  1  0.969  0.855  0.361  1.0
  F  F21  1  0.469  0.145  0.639  1.0
  F  F22  1  0.031  0.145  0.639  1.0
  F  F23  1  0.531  0.855  0.361  1.0
  F  F24  1  0.937  0.802  0.615  1.0
  F  F25  1  0.437  0.198  0.385  1.0
  F  F26  1  0.063  0.198  0.385  1.0
  F  F27  1  0.563  0.802  0.615  1.0
  F  F28  1  0.036  0.722  0.069  1.0
  F  F29  1  0.536  0.278  0.931  1.0
  F  F30  1  0.964  0.278  0.931  1.0
  F  F31  1  0.464  0.722  0.069  1.0
  F  F32  1  0.440  0.388  0.163  1.0
  F  F33  1  0.940  0.612  0.837  1.0
  F  F34  1  0.560  0.612  0.837  1.0
  F  F35  1  0.060  0.388  0.163  1.0
[/CIF]
.