The compound described by RbNaLi6(SiO4)2 crystallizes in the monoclinic C2/m space group. Rb(1) is bonded in a distorted body-centered cubic geometry to four equivalent O(1) and four equivalent O(2) atoms. Na(1) is bonded in a body-centered cubic geometry to two equivalent O(3), two equivalent O(4), two equivalent O(5), and two equivalent O(6) atoms. There are four inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(5), one O(6), and two equivalent O(1) atoms to form LiO4 tetrahedra that share corners with two equivalent Si(1)O4 tetrahedra and corners with two equivalent Si(2)O4 tetrahedra. In the second Li site, Li(2) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(4), and one O(5) atom. In the third Li site, Li(3) is bonded in a 3-coordinate geometry to one O(1), one O(3), and one O(6) atom. In the fourth Li site, Li(4) is bonded to one O(3), one O(4), and two equivalent O(2) atoms to form LiO4 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(3), one O(4), and two equivalent O(1) atoms to form SiO4 tetrahedra that share corners with two equivalent Li(1)O4 tetrahedra and corners with two equivalent Li(4)O4 tetrahedra. In the second Si site, Si(2) is bonded to one O(5), one O(6), and two equivalent O(2) atoms to form SiO4 tetrahedra that share corners with two equivalent Li(1)O4 tetrahedra and corners with two equivalent Li(4)O4 tetrahedra. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to two equivalent Rb(1), one Li(1), one Li(2), one Li(3), and one Si(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Rb(1), one Li(2), one Li(4), and one Si(2) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Na(1), one Li(4), two equivalent Li(3), and one Si(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to two equivalent Na(1), one Li(4), two equivalent Li(2), and one Si(1) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to two equivalent Na(1), one Li(1), two equivalent Li(2), and one Si(2) atom. In the sixth O site, O(6) is bonded in a 6-coordinate geometry to two equivalent Na(1), one Li(1), two equivalent Li(3), and one Si(2) atom. is represented by the CIF file [CIF]
data_RbNaLi6(SiO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.551
_cell_length_b   8.551
_cell_length_c   7.887
_cell_angle_alpha   89.468
_cell_angle_beta   89.468
_cell_angle_gamma   43.686
_symmetry_Int_Tables_number   1
_cell_volume   398.267
_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  0.755  0.755  0.469  1.0
  Rb  Rb1  1  0.245  0.245  0.531  1.0
  Na  Na2  1  0.252  0.748  0.000  1.0
  Na  Na3  1  0.748  0.252  0.000  1.0
  Li  Li4  1  0.359  0.359  0.866  1.0
  Li  Li5  1  0.324  0.815  0.374  1.0
  Li  Li6  1  0.555  0.071  0.134  1.0
  Li  Li7  1  0.071  0.555  0.134  1.0
  Li  Li8  1  0.929  0.445  0.866  1.0
  Li  Li9  1  0.445  0.929  0.866  1.0
  Li  Li10  1  0.067  0.067  0.717  1.0
  Li  Li11  1  0.185  0.676  0.626  1.0
  Li  Li12  1  0.641  0.641  0.134  1.0
  Li  Li13  1  0.815  0.324  0.374  1.0
  Li  Li14  1  0.676  0.185  0.626  1.0
  Li  Li15  1  0.933  0.933  0.283  1.0
  Si  Si16  1  0.146  0.146  0.140  1.0
  Si  Si17  1  0.854  0.854  0.860  1.0
  Si  Si18  1  0.571  0.571  0.708  1.0
  Si  Si19  1  0.429  0.429  0.292  1.0
  O  O20  1  0.976  0.414  0.195  1.0
  O  O21  1  0.818  0.380  0.609  1.0
  O  O22  1  0.586  0.024  0.805  1.0
  O  O23  1  0.130  0.130  0.933  1.0
  O  O24  1  0.380  0.818  0.609  1.0
  O  O25  1  0.053  0.053  0.239  1.0
  O  O26  1  0.468  0.468  0.744  1.0
  O  O27  1  0.384  0.384  0.103  1.0
  O  O28  1  0.414  0.976  0.195  1.0
  O  O29  1  0.532  0.532  0.256  1.0
  O  O30  1  0.620  0.182  0.391  1.0
  O  O31  1  0.182  0.620  0.391  1.0
  O  O32  1  0.870  0.870  0.067  1.0
  O  O33  1  0.947  0.947  0.761  1.0
  O  O34  1  0.616  0.616  0.897  1.0
  O  O35  1  0.024  0.586  0.805  1.0
[/CIF]
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The compound described by RbNaLi6(SiO4)2 crystallizes in the monoclinic C2/m space group. Rb(1) is bonded in a distorted body-centered cubic geometry to four equivalent O(1) and four equivalent O(2) atoms. Na(1) is bonded in a body-centered cubic geometry to two equivalent O(3), two equivalent O(4), two equivalent O(5), and two equivalent O(6) atoms. There are four inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(5), one O(6), and two equivalent O(1) atoms to form LiO4 tetrahedra that share corners with two equivalent Si(1)O4 tetrahedra and corners with two equivalent Si(2)O4 tetrahedra. In the second Li site, Li(2) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(4), and one O(5) atom. In the third Li site, Li(3) is bonded in a 3-coordinate geometry to one O(1), one O(3), and one O(6) atom. In the fourth Li site, Li(4) is bonded to one O(3), one O(4), and two equivalent O(2) atoms to form LiO4 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(3), one O(4), and two equivalent O(1) atoms to form SiO4 tetrahedra that share corners with two equivalent Li(1)O4 tetrahedra and corners with two equivalent Li(4)O4 tetrahedra. In the second Si site, Si(2) is bonded to one O(5), one O(6), and two equivalent O(2) atoms to form SiO4 tetrahedra that share corners with two equivalent Li(1)O4 tetrahedra and corners with two equivalent Li(4)O4 tetrahedra. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to two equivalent Rb(1), one Li(1), one Li(2), one Li(3), and one Si(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Rb(1), one Li(2), one Li(4), and one Si(2) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Na(1), one Li(4), two equivalent Li(3), and one Si(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to two equivalent Na(1), one Li(4), two equivalent Li(2), and one Si(1) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to two equivalent Na(1), one Li(1), two equivalent Li(2), and one Si(2) atom. In the sixth O site, O(6) is bonded in a 6-coordinate geometry to two equivalent Na(1), one Li(1), two equivalent Li(3), and one Si(2) atom. is represented by the CIF file [CIF]
data_RbNaLi6(SiO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.551
_cell_length_b   8.551
_cell_length_c   7.887
_cell_angle_alpha   89.468
_cell_angle_beta   89.468
_cell_angle_gamma   43.686
_symmetry_Int_Tables_number   1
_cell_volume   398.267
_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  0.755  0.755  0.469  1.0
  Rb  Rb1  1  0.245  0.245  0.531  1.0
  Na  Na2  1  0.252  0.748  0.000  1.0
  Na  Na3  1  0.748  0.252  0.000  1.0
  Li  Li4  1  0.359  0.359  0.866  1.0
  Li  Li5  1  0.324  0.815  0.374  1.0
  Li  Li6  1  0.555  0.071  0.134  1.0
  Li  Li7  1  0.071  0.555  0.134  1.0
  Li  Li8  1  0.929  0.445  0.866  1.0
  Li  Li9  1  0.445  0.929  0.866  1.0
  Li  Li10  1  0.067  0.067  0.717  1.0
  Li  Li11  1  0.185  0.676  0.626  1.0
  Li  Li12  1  0.641  0.641  0.134  1.0
  Li  Li13  1  0.815  0.324  0.374  1.0
  Li  Li14  1  0.676  0.185  0.626  1.0
  Li  Li15  1  0.933  0.933  0.283  1.0
  Si  Si16  1  0.146  0.146  0.140  1.0
  Si  Si17  1  0.854  0.854  0.860  1.0
  Si  Si18  1  0.571  0.571  0.708  1.0
  Si  Si19  1  0.429  0.429  0.292  1.0
  O  O20  1  0.976  0.414  0.195  1.0
  O  O21  1  0.818  0.380  0.609  1.0
  O  O22  1  0.586  0.024  0.805  1.0
  O  O23  1  0.130  0.130  0.933  1.0
  O  O24  1  0.380  0.818  0.609  1.0
  O  O25  1  0.053  0.053  0.239  1.0
  O  O26  1  0.468  0.468  0.744  1.0
  O  O27  1  0.384  0.384  0.103  1.0
  O  O28  1  0.414  0.976  0.195  1.0
  O  O29  1  0.532  0.532  0.256  1.0
  O  O30  1  0.620  0.182  0.391  1.0
  O  O31  1  0.182  0.620  0.391  1.0
  O  O32  1  0.870  0.870  0.067  1.0
  O  O33  1  0.947  0.947  0.761  1.0
  O  O34  1  0.616  0.616  0.897  1.0
  O  O35  1  0.024  0.586  0.805  1.0
[/CIF]
.