The structure described by La2(SiO3)3 crystallizes in the triclinic P-1 space group. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 9-coordinate geometry to one O(4), one O(6), one O(7), one O(8), one O(9), two equivalent O(2), and two equivalent O(3) atoms. In the second La site, La(2) is bonded in a 9-coordinate geometry to one O(2), one O(3), one O(4), one O(6), one O(7), one O(8), one O(9), and two equivalent O(1) atoms. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(2), one O(3), one O(5), and two equivalent O(1) atoms to form distorted SiO5 trigonal bipyramids that share corners with two equivalent Si(2)O6 octahedra and  an edgeedge with one Si(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 45-54°. In the second Si site, Si(2) is bonded to one O(8), one O(9), two equivalent O(4), and two equivalent O(5) atoms to form SiO6 octahedra that share corners with two equivalent Si(3)O4 tetrahedra, corners with two equivalent Si(1)O5 trigonal bipyramids, and edges with two equivalent Si(2)O6 octahedra. In the third Si site, Si(3) is bonded to one O(6), one O(7), one O(8), and one O(9) atom to form corner-sharing SiO4 tetrahedra. The corner-sharing octahedral tilt angles range from 53-54°. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent La(2) and two equivalent Si(1) atoms. In the second O site, O(2) is bonded in a 4-coordinate geometry to one La(2), two equivalent La(1), and one Si(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one La(2), two equivalent La(1), and one Si(1) atom. In the fourth O site, O(4) is bonded in a distorted L-shaped geometry to one La(1), one La(2), and two equivalent Si(2) atoms. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Si(1) and two equivalent Si(2) atoms. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one La(1), one La(2), and one Si(3) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one La(1), one La(2), and one Si(3) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one La(1), one La(2), one Si(2), and one Si(3) atom. In the ninth O site, O(9) is bonded in a distorted bent 120 degrees geometry to one La(1), one La(2), one Si(2), and one Si(3) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_La2(SiO3)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.564
_cell_length_b   7.600
_cell_length_c   8.683
_cell_angle_alpha   108.208
_cell_angle_beta   108.206
_cell_angle_gamma   91.725
_symmetry_Int_Tables_number   1
_cell_volume   327.977
_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
  La  La0  1  0.807  0.183  0.584  1.0
  La  La1  1  0.132  0.204  0.218  1.0
  La  La2  1  0.868  0.796  0.782  1.0
  La  La3  1  0.193  0.817  0.416  1.0
  Si  Si4  1  0.430  0.077  0.860  1.0
  Si  Si5  1  0.763  0.487  0.998  1.0
  Si  Si6  1  0.340  0.481  0.668  1.0
  Si  Si7  1  0.660  0.519  0.332  1.0
  Si  Si8  1  0.237  0.513  0.002  1.0
  Si  Si9  1  0.570  0.923  0.140  1.0
  O  O10  1  0.701  0.006  0.999  1.0
  O  O11  1  0.132  0.016  0.710  1.0
  O  O12  1  0.574  0.031  0.706  1.0
  O  O13  1  0.987  0.334  0.956  1.0
  O  O14  1  0.471  0.323  0.952  1.0
  O  O15  1  0.204  0.287  0.515  1.0
  O  O16  1  0.623  0.338  0.385  1.0
  O  O17  1  0.639  0.470  0.778  1.0
  O  O18  1  0.149  0.510  0.786  1.0
  O  O19  1  0.851  0.490  0.214  1.0
  O  O20  1  0.361  0.530  0.222  1.0
  O  O21  1  0.377  0.662  0.615  1.0
  O  O22  1  0.796  0.713  0.485  1.0
  O  O23  1  0.529  0.677  0.048  1.0
  O  O24  1  0.013  0.666  0.044  1.0
  O  O25  1  0.426  0.969  0.294  1.0
  O  O26  1  0.868  0.984  0.290  1.0
  O  O27  1  0.299  0.994  0.001  1.0
[/CIF]
.
The structure described by La2(SiO3)3 crystallizes in the triclinic P-1 space group. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 9-coordinate geometry to one O(4), one O(6), one O(7), one O(8), one O(9), two equivalent O(2), and two equivalent O(3) atoms. In the second La site, La(2) is bonded in a 9-coordinate geometry to one O(2), one O(3), one O(4), one O(6), one O(7), one O(8), one O(9), and two equivalent O(1) atoms. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(2), one O(3), one O(5), and two equivalent O(1) atoms to form distorted SiO5 trigonal bipyramids that share corners with two equivalent Si(2)O6 octahedra and  an edgeedge with one Si(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 45-54°. In the second Si site, Si(2) is bonded to one O(8), one O(9), two equivalent O(4), and two equivalent O(5) atoms to form SiO6 octahedra that share corners with two equivalent Si(3)O4 tetrahedra, corners with two equivalent Si(1)O5 trigonal bipyramids, and edges with two equivalent Si(2)O6 octahedra. In the third Si site, Si(3) is bonded to one O(6), one O(7), one O(8), and one O(9) atom to form corner-sharing SiO4 tetrahedra. The corner-sharing octahedral tilt angles range from 53-54°. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent La(2) and two equivalent Si(1) atoms. In the second O site, O(2) is bonded in a 4-coordinate geometry to one La(2), two equivalent La(1), and one Si(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one La(2), two equivalent La(1), and one Si(1) atom. In the fourth O site, O(4) is bonded in a distorted L-shaped geometry to one La(1), one La(2), and two equivalent Si(2) atoms. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Si(1) and two equivalent Si(2) atoms. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one La(1), one La(2), and one Si(3) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one La(1), one La(2), and one Si(3) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one La(1), one La(2), one Si(2), and one Si(3) atom. In the ninth O site, O(9) is bonded in a distorted bent 120 degrees geometry to one La(1), one La(2), one Si(2), and one Si(3) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_La2(SiO3)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.564
_cell_length_b   7.600
_cell_length_c   8.683
_cell_angle_alpha   108.208
_cell_angle_beta   108.206
_cell_angle_gamma   91.725
_symmetry_Int_Tables_number   1
_cell_volume   327.977
_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
  La  La0  1  0.807  0.183  0.584  1.0
  La  La1  1  0.132  0.204  0.218  1.0
  La  La2  1  0.868  0.796  0.782  1.0
  La  La3  1  0.193  0.817  0.416  1.0
  Si  Si4  1  0.430  0.077  0.860  1.0
  Si  Si5  1  0.763  0.487  0.998  1.0
  Si  Si6  1  0.340  0.481  0.668  1.0
  Si  Si7  1  0.660  0.519  0.332  1.0
  Si  Si8  1  0.237  0.513  0.002  1.0
  Si  Si9  1  0.570  0.923  0.140  1.0
  O  O10  1  0.701  0.006  0.999  1.0
  O  O11  1  0.132  0.016  0.710  1.0
  O  O12  1  0.574  0.031  0.706  1.0
  O  O13  1  0.987  0.334  0.956  1.0
  O  O14  1  0.471  0.323  0.952  1.0
  O  O15  1  0.204  0.287  0.515  1.0
  O  O16  1  0.623  0.338  0.385  1.0
  O  O17  1  0.639  0.470  0.778  1.0
  O  O18  1  0.149  0.510  0.786  1.0
  O  O19  1  0.851  0.490  0.214  1.0
  O  O20  1  0.361  0.530  0.222  1.0
  O  O21  1  0.377  0.662  0.615  1.0
  O  O22  1  0.796  0.713  0.485  1.0
  O  O23  1  0.529  0.677  0.048  1.0
  O  O24  1  0.013  0.666  0.044  1.0
  O  O25  1  0.426  0.969  0.294  1.0
  O  O26  1  0.868  0.984  0.290  1.0
  O  O27  1  0.299  0.994  0.001  1.0
[/CIF]
.