The compound described by Na(SiO4)2 crystallizes in the orthorhombic Pbcn space group. Na(1) is bonded in a 6-coordinate geometry to two equivalent O(5) and four equivalent O(4) atoms. Si(1) is bonded to one O(1), one O(3), and two equivalent O(2) atoms to form corner-sharing SiO4 tetrahedra. There are five inequivalent O sites. In the first O site, O(4) is bonded in a distorted T-shaped geometry to two equivalent Na(1) and one O(3) atom. In the second O site, O(5) is bonded in a linear geometry to two equivalent Na(1) atoms. In the third O site, O(1) is bonded in a bent 150 degrees geometry to two equivalent Si(1) atoms. In the fourth O site, O(2) is bonded in a bent 150 degrees geometry to two equivalent Si(1) atoms. In the fifth O site, O(3) is bonded in a distorted single-bond geometry to one Si(1) and one O(4) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na(SiO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.893
_cell_length_b   7.935
_cell_length_c   17.450
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   677.531
_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
  Na  Na0  1  0.000  0.750  0.995  1.0
  Na  Na1  1  0.500  0.250  0.505  1.0
  Na  Na2  1  0.000  0.250  0.005  1.0
  Na  Na3  1  0.500  0.750  0.495  1.0
  Si  Si4  1  0.998  0.448  0.701  1.0
  Si  Si5  1  0.502  0.948  0.799  1.0
  Si  Si6  1  0.498  0.552  0.799  1.0
  Si  Si7  1  0.002  0.052  0.701  1.0
  Si  Si8  1  0.002  0.552  0.299  1.0
  Si  Si9  1  0.498  0.052  0.201  1.0
  Si  Si10  1  0.502  0.448  0.201  1.0
  Si  Si11  1  0.998  0.948  0.299  1.0
  O  O12  1  0.000  0.750  0.320  1.0
  O  O13  1  0.500  0.250  0.180  1.0
  O  O14  1  0.000  0.250  0.680  1.0
  O  O15  1  0.500  0.750  0.820  1.0
  O  O16  1  0.294  0.516  0.727  1.0
  O  O17  1  0.206  0.016  0.773  1.0
  O  O18  1  0.794  0.484  0.773  1.0
  O  O19  1  0.706  0.984  0.727  1.0
  O  O20  1  0.706  0.484  0.273  1.0
  O  O21  1  0.794  0.984  0.227  1.0
  O  O22  1  0.206  0.516  0.227  1.0
  O  O23  1  0.294  0.016  0.273  1.0
  O  O24  1  0.922  0.566  0.624  1.0
  O  O25  1  0.578  0.066  0.876  1.0
  O  O26  1  0.422  0.434  0.876  1.0
  O  O27  1  0.078  0.934  0.624  1.0
  O  O28  1  0.078  0.434  0.376  1.0
  O  O29  1  0.422  0.934  0.124  1.0
  O  O30  1  0.578  0.566  0.124  1.0
  O  O31  1  0.922  0.066  0.376  1.0
  O  O32  1  0.207  0.507  0.917  1.0
  O  O33  1  0.293  0.007  0.583  1.0
  O  O34  1  0.707  0.493  0.583  1.0
  O  O35  1  0.793  0.993  0.917  1.0
  O  O36  1  0.793  0.493  0.083  1.0
  O  O37  1  0.707  0.993  0.417  1.0
  O  O38  1  0.293  0.507  0.417  1.0
  O  O39  1  0.207  0.007  0.083  1.0
  O  O40  1  0.000  0.750  0.475  1.0
  O  O41  1  0.500  0.250  0.025  1.0
  O  O42  1  0.000  0.250  0.525  1.0
  O  O43  1  0.500  0.750  0.975  1.0
[/CIF]
.
The compound described by Na(SiO4)2 crystallizes in the orthorhombic Pbcn space group. Na(1) is bonded in a 6-coordinate geometry to two equivalent O(5) and four equivalent O(4) atoms. Si(1) is bonded to one O(1), one O(3), and two equivalent O(2) atoms to form corner-sharing SiO4 tetrahedra. There are five inequivalent O sites. In the first O site, O(4) is bonded in a distorted T-shaped geometry to two equivalent Na(1) and one O(3) atom. In the second O site, O(5) is bonded in a linear geometry to two equivalent Na(1) atoms. In the third O site, O(1) is bonded in a bent 150 degrees geometry to two equivalent Si(1) atoms. In the fourth O site, O(2) is bonded in a bent 150 degrees geometry to two equivalent Si(1) atoms. In the fifth O site, O(3) is bonded in a distorted single-bond geometry to one Si(1) and one O(4) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na(SiO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.893
_cell_length_b   7.935
_cell_length_c   17.450
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   677.531
_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
  Na  Na0  1  0.000  0.750  0.995  1.0
  Na  Na1  1  0.500  0.250  0.505  1.0
  Na  Na2  1  0.000  0.250  0.005  1.0
  Na  Na3  1  0.500  0.750  0.495  1.0
  Si  Si4  1  0.998  0.448  0.701  1.0
  Si  Si5  1  0.502  0.948  0.799  1.0
  Si  Si6  1  0.498  0.552  0.799  1.0
  Si  Si7  1  0.002  0.052  0.701  1.0
  Si  Si8  1  0.002  0.552  0.299  1.0
  Si  Si9  1  0.498  0.052  0.201  1.0
  Si  Si10  1  0.502  0.448  0.201  1.0
  Si  Si11  1  0.998  0.948  0.299  1.0
  O  O12  1  0.000  0.750  0.320  1.0
  O  O13  1  0.500  0.250  0.180  1.0
  O  O14  1  0.000  0.250  0.680  1.0
  O  O15  1  0.500  0.750  0.820  1.0
  O  O16  1  0.294  0.516  0.727  1.0
  O  O17  1  0.206  0.016  0.773  1.0
  O  O18  1  0.794  0.484  0.773  1.0
  O  O19  1  0.706  0.984  0.727  1.0
  O  O20  1  0.706  0.484  0.273  1.0
  O  O21  1  0.794  0.984  0.227  1.0
  O  O22  1  0.206  0.516  0.227  1.0
  O  O23  1  0.294  0.016  0.273  1.0
  O  O24  1  0.922  0.566  0.624  1.0
  O  O25  1  0.578  0.066  0.876  1.0
  O  O26  1  0.422  0.434  0.876  1.0
  O  O27  1  0.078  0.934  0.624  1.0
  O  O28  1  0.078  0.434  0.376  1.0
  O  O29  1  0.422  0.934  0.124  1.0
  O  O30  1  0.578  0.566  0.124  1.0
  O  O31  1  0.922  0.066  0.376  1.0
  O  O32  1  0.207  0.507  0.917  1.0
  O  O33  1  0.293  0.007  0.583  1.0
  O  O34  1  0.707  0.493  0.583  1.0
  O  O35  1  0.793  0.993  0.917  1.0
  O  O36  1  0.793  0.493  0.083  1.0
  O  O37  1  0.707  0.993  0.417  1.0
  O  O38  1  0.293  0.507  0.417  1.0
  O  O39  1  0.207  0.007  0.083  1.0
  O  O40  1  0.000  0.750  0.475  1.0
  O  O41  1  0.500  0.250  0.025  1.0
  O  O42  1  0.000  0.250  0.525  1.0
  O  O43  1  0.500  0.750  0.975  1.0
[/CIF]
.