The crystal structure described by RbNaSi2O5 crystallizes in the monoclinic P2_1/c space group. Rb(1) is bonded in a 8-coordinate geometry to one O(2), two equivalent O(3), two equivalent O(4), and three equivalent O(5) atoms. Na(1) is bonded in a 5-coordinate geometry to one O(1), one O(5), and three equivalent O(2) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form corner-sharing SiO4 tetrahedra. In the second Si site, Si(2) is bonded to one O(1), one O(3), one O(4), and one O(5) atom to form corner-sharing SiO4 tetrahedra. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Na(1), one Si(1), and one Si(2) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Rb(1), three equivalent Na(1), and one Si(1) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to two equivalent Rb(1), one Si(1), and one Si(2) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to two equivalent Rb(1), one Si(1), and one Si(2) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to three equivalent Rb(1), one Na(1), and one Si(2) atom. is represented by the CIF card [CIF]
data_RbNaSi2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   13.781
_cell_length_b   4.944
_cell_length_c   7.913
_cell_angle_alpha   89.001
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   539.036
_cell_formula_units_Z   4
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  0.803  0.280  0.784  1.0
  Rb  Rb1  1  0.697  0.280  0.284  1.0
  Rb  Rb2  1  0.303  0.720  0.716  1.0
  Rb  Rb3  1  0.197  0.720  0.216  1.0
  Na  Na4  1  0.092  0.230  0.961  1.0
  Na  Na5  1  0.408  0.230  0.461  1.0
  Na  Na6  1  0.908  0.770  0.039  1.0
  Na  Na7  1  0.592  0.770  0.539  1.0
  Si  Si8  1  0.545  0.297  0.790  1.0
  Si  Si9  1  0.631  0.792  0.979  1.0
  Si  Si10  1  0.131  0.208  0.521  1.0
  Si  Si11  1  0.045  0.703  0.710  1.0
  Si  Si12  1  0.369  0.208  0.021  1.0
  Si  Si13  1  0.455  0.703  0.210  1.0
  Si  Si14  1  0.955  0.297  0.290  1.0
  Si  Si15  1  0.869  0.792  0.479  1.0
  O  O16  1  0.928  0.618  0.333  1.0
  O  O17  1  0.065  0.758  0.905  1.0
  O  O18  1  0.572  0.618  0.833  1.0
  O  O19  1  0.111  0.885  0.575  1.0
  O  O20  1  0.565  0.242  0.595  1.0
  O  O21  1  0.072  0.382  0.667  1.0
  O  O22  1  0.571  0.746  0.163  1.0
  O  O23  1  0.929  0.746  0.663  1.0
  O  O24  1  0.743  0.728  1.000  1.0
  O  O25  1  0.889  0.115  0.425  1.0
  O  O26  1  0.071  0.254  0.337  1.0
  O  O27  1  0.428  0.382  0.167  1.0
  O  O28  1  0.429  0.254  0.837  1.0
  O  O29  1  0.611  0.115  0.925  1.0
  O  O30  1  0.257  0.272  0.000  1.0
  O  O31  1  0.435  0.758  0.405  1.0
  O  O32  1  0.757  0.728  0.500  1.0
  O  O33  1  0.935  0.242  0.095  1.0
  O  O34  1  0.389  0.885  0.075  1.0
  O  O35  1  0.243  0.272  0.500  1.0
[/CIF]
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The crystal structure described by RbNaSi2O5 crystallizes in the monoclinic P2_1/c space group. Rb(1) is bonded in a 8-coordinate geometry to one O(2), two equivalent O(3), two equivalent O(4), and three equivalent O(5) atoms. Na(1) is bonded in a 5-coordinate geometry to one O(1), one O(5), and three equivalent O(2) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form corner-sharing SiO4 tetrahedra. In the second Si site, Si(2) is bonded to one O(1), one O(3), one O(4), and one O(5) atom to form corner-sharing SiO4 tetrahedra. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Na(1), one Si(1), and one Si(2) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Rb(1), three equivalent Na(1), and one Si(1) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to two equivalent Rb(1), one Si(1), and one Si(2) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to two equivalent Rb(1), one Si(1), and one Si(2) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to three equivalent Rb(1), one Na(1), and one Si(2) atom. is represented by the CIF card [CIF]
data_RbNaSi2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   13.781
_cell_length_b   4.944
_cell_length_c   7.913
_cell_angle_alpha   89.001
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   539.036
_cell_formula_units_Z   4
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  0.803  0.280  0.784  1.0
  Rb  Rb1  1  0.697  0.280  0.284  1.0
  Rb  Rb2  1  0.303  0.720  0.716  1.0
  Rb  Rb3  1  0.197  0.720  0.216  1.0
  Na  Na4  1  0.092  0.230  0.961  1.0
  Na  Na5  1  0.408  0.230  0.461  1.0
  Na  Na6  1  0.908  0.770  0.039  1.0
  Na  Na7  1  0.592  0.770  0.539  1.0
  Si  Si8  1  0.545  0.297  0.790  1.0
  Si  Si9  1  0.631  0.792  0.979  1.0
  Si  Si10  1  0.131  0.208  0.521  1.0
  Si  Si11  1  0.045  0.703  0.710  1.0
  Si  Si12  1  0.369  0.208  0.021  1.0
  Si  Si13  1  0.455  0.703  0.210  1.0
  Si  Si14  1  0.955  0.297  0.290  1.0
  Si  Si15  1  0.869  0.792  0.479  1.0
  O  O16  1  0.928  0.618  0.333  1.0
  O  O17  1  0.065  0.758  0.905  1.0
  O  O18  1  0.572  0.618  0.833  1.0
  O  O19  1  0.111  0.885  0.575  1.0
  O  O20  1  0.565  0.242  0.595  1.0
  O  O21  1  0.072  0.382  0.667  1.0
  O  O22  1  0.571  0.746  0.163  1.0
  O  O23  1  0.929  0.746  0.663  1.0
  O  O24  1  0.743  0.728  1.000  1.0
  O  O25  1  0.889  0.115  0.425  1.0
  O  O26  1  0.071  0.254  0.337  1.0
  O  O27  1  0.428  0.382  0.167  1.0
  O  O28  1  0.429  0.254  0.837  1.0
  O  O29  1  0.611  0.115  0.925  1.0
  O  O30  1  0.257  0.272  0.000  1.0
  O  O31  1  0.435  0.758  0.405  1.0
  O  O32  1  0.757  0.728  0.500  1.0
  O  O33  1  0.935  0.242  0.095  1.0
  O  O34  1  0.389  0.885  0.075  1.0
  O  O35  1  0.243  0.272  0.500  1.0
[/CIF]
.