The crystal structure described by Rb2Li2SiO4 crystallizes in the triclinic P-1 space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 7-coordinate geometry to one O(2), two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms. In the second Rb site, Rb(2) is bonded in a 6-coordinate geometry to two equivalent O(1) and four equivalent O(3) atoms. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded in a 4-coordinate geometry to one O(1), one O(4), and two equivalent O(2) atoms. In the second Li site, Li(2) is bonded to one O(1), one O(2), and two equivalent O(4) atoms to form distorted LiO4 tetrahedra that share corners with two equivalent Si(1)O4 tetrahedra,  an edgeedge with one Li(2)O4 tetrahedra, and  an edgeedge with one Si(1)O4 tetrahedra. Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SiO4 tetrahedra that share corners with two equivalent Li(2)O4 tetrahedra and  an edgeedge with one Li(2)O4 tetrahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to two equivalent Rb(1), two equivalent Rb(2), one Li(1), one Li(2), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Rb(1), one Li(2), two equivalent Li(1), and one Si(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to two equivalent Rb(1), four equivalent Rb(2), and one Si(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to two equivalent Rb(1), one Li(1), two equivalent Li(2), and one Si(1) atom. is represented by the CIF card [CIF]
data_Rb2Li2SiO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.520
_cell_length_b   5.705
_cell_length_c   8.850
_cell_angle_alpha   83.685
_cell_angle_beta   75.394
_cell_angle_gamma   85.706
_symmetry_Int_Tables_number   1
_cell_volume   267.733
_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  0.477  0.851  0.731  1.0
  Rb  Rb1  1  0.523  0.149  0.269  1.0
  Rb  Rb2  1  0.792  0.728  0.018  1.0
  Rb  Rb3  1  0.208  0.272  0.982  1.0
  Li  Li4  1  0.932  0.188  0.438  1.0
  Li  Li5  1  0.068  0.812  0.562  1.0
  Li  Li6  1  0.697  0.593  0.418  1.0
  Li  Li7  1  0.303  0.407  0.582  1.0
  Si  Si8  1  0.146  0.688  0.282  1.0
  Si  Si9  1  0.854  0.312  0.718  1.0
  O  O10  1  0.999  0.558  0.720  1.0
  O  O11  1  0.001  0.442  0.280  1.0
  O  O12  1  0.918  0.867  0.381  1.0
  O  O13  1  0.082  0.133  0.619  1.0
  O  O14  1  0.271  0.797  0.102  1.0
  O  O15  1  0.729  0.203  0.898  1.0
  O  O16  1  0.357  0.641  0.390  1.0
  O  O17  1  0.643  0.359  0.610  1.0
[/CIF]
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The crystal structure described by Rb2Li2SiO4 crystallizes in the triclinic P-1 space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 7-coordinate geometry to one O(2), two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms. In the second Rb site, Rb(2) is bonded in a 6-coordinate geometry to two equivalent O(1) and four equivalent O(3) atoms. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded in a 4-coordinate geometry to one O(1), one O(4), and two equivalent O(2) atoms. In the second Li site, Li(2) is bonded to one O(1), one O(2), and two equivalent O(4) atoms to form distorted LiO4 tetrahedra that share corners with two equivalent Si(1)O4 tetrahedra,  an edgeedge with one Li(2)O4 tetrahedra, and  an edgeedge with one Si(1)O4 tetrahedra. Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SiO4 tetrahedra that share corners with two equivalent Li(2)O4 tetrahedra and  an edgeedge with one Li(2)O4 tetrahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to two equivalent Rb(1), two equivalent Rb(2), one Li(1), one Li(2), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Rb(1), one Li(2), two equivalent Li(1), and one Si(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to two equivalent Rb(1), four equivalent Rb(2), and one Si(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to two equivalent Rb(1), one Li(1), two equivalent Li(2), and one Si(1) atom. is represented by the CIF card [CIF]
data_Rb2Li2SiO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.520
_cell_length_b   5.705
_cell_length_c   8.850
_cell_angle_alpha   83.685
_cell_angle_beta   75.394
_cell_angle_gamma   85.706
_symmetry_Int_Tables_number   1
_cell_volume   267.733
_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  0.477  0.851  0.731  1.0
  Rb  Rb1  1  0.523  0.149  0.269  1.0
  Rb  Rb2  1  0.792  0.728  0.018  1.0
  Rb  Rb3  1  0.208  0.272  0.982  1.0
  Li  Li4  1  0.932  0.188  0.438  1.0
  Li  Li5  1  0.068  0.812  0.562  1.0
  Li  Li6  1  0.697  0.593  0.418  1.0
  Li  Li7  1  0.303  0.407  0.582  1.0
  Si  Si8  1  0.146  0.688  0.282  1.0
  Si  Si9  1  0.854  0.312  0.718  1.0
  O  O10  1  0.999  0.558  0.720  1.0
  O  O11  1  0.001  0.442  0.280  1.0
  O  O12  1  0.918  0.867  0.381  1.0
  O  O13  1  0.082  0.133  0.619  1.0
  O  O14  1  0.271  0.797  0.102  1.0
  O  O15  1  0.729  0.203  0.898  1.0
  O  O16  1  0.357  0.641  0.390  1.0
  O  O17  1  0.643  0.359  0.610  1.0
[/CIF]
.