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 2-coordinate geometry to one O(2), one O(3), one O(4), and one O(7) atom. In the second La site, La(2) is bonded in a 4-coordinate geometry to one O(2), one O(6), one O(8), and two equivalent O(4) atoms. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 3-coordinate geometry to one O(1), one O(2), one O(3), and one O(5) atom. In the second Si site, Si(2) is bonded in a 2-coordinate geometry to one O(8), one O(9), and two equivalent O(4) atoms. In the third Si site, Si(3) is bonded in a 2-coordinate geometry to one O(6) and one O(7) atom. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a single-bond geometry to one Si(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one La(1), one La(2), and one Si(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one La(1) and one Si(1) atom. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to one La(1), two equivalent La(2), two equivalent Si(2), and one O(4) atom. In the fifth O site, O(5) is bonded in a single-bond geometry to one Si(1) atom. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to one La(2) and one Si(3) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one La(1) and one Si(3) atom. In the eighth O site, O(8) is bonded in a 2-coordinate geometry to one La(2) and one Si(2) atom. In the ninth O site, O(9) is bonded in a 1-coordinate geometry to one Si(2) atom.
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 2-coordinate geometry to one O(2), one O(3), one O(4), and one O(7) atom. The La(1)-O(2) bond length is 2.73 Å. The La(1)-O(3) bond length is 2.41 Å. The La(1)-O(4) bond length is 2.72 Å. The La(1)-O(7) bond length is 2.24 Å. In the second La site, La(2) is bonded in a 4-coordinate geometry to one O(2), one O(6), one O(8), and two equivalent O(4) atoms. The La(2)-O(2) bond length is 2.48 Å. The La(2)-O(6) bond length is 2.14 Å. The La(2)-O(8) bond length is 2.22 Å. There is one shorter (2.27 Å) and one longer (2.96 Å) La(2)-O(4) bond length. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 3-coordinate geometry to one O(1), one O(2), one O(3), and one O(5) atom. The Si(1)-O(1) bond length is 1.77 Å. The Si(1)-O(2) bond length is 2.39 Å. The Si(1)-O(3) bond length is 2.02 Å. The Si(1)-O(5) bond length is 1.41 Å. In the second Si site, Si(2) is bonded in a 2-coordinate geometry to one O(8), one O(9), and two equivalent O(4) atoms. The Si(2)-O(8) bond length is 1.66 Å. The Si(2)-O(9) bond length is 1.58 Å. There is one shorter (2.00 Å) and one longer (2.45 Å) Si(2)-O(4) bond length. In the third Si site, Si(3) is bonded in a 2-coordinate geometry to one O(6) and one O(7) atom. The Si(3)-O(6) bond length is 1.48 Å. The Si(3)-O(7) bond length is 1.09 Å. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a single-bond geometry to one Si(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one La(1), one La(2), and one Si(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one La(1) and one Si(1) atom. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to one La(1), two equivalent La(2), two equivalent Si(2), and one O(4) atom. The O(4)-O(4) bond length is 1.87 Å. In the fifth O site, O(5) is bonded in a single-bond geometry to one Si(1) atom. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to one La(2) and one Si(3) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one La(1) and one Si(3) atom. In the eighth O site, O(8) is bonded in a 2-coordinate geometry to one La(2) and one Si(2) atom. In the ninth O site, O(9) is bonded in a 1-coordinate geometry to one Si(2) atom.