La4V5(Si2O11)2 is Esseneite-like structured and crystallizes in the monoclinic C2/m space group. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 10-coordinate geometry to one O(3), one O(7), two equivalent O(2), two equivalent O(4), two equivalent O(5), and two equivalent O(8) atoms. In the second La site, La(2) is bonded in a 8-coordinate geometry to one O(3), one O(6), two equivalent O(2), two equivalent O(5), and two equivalent O(8) atoms. There are four inequivalent V sites. In the first V site, V(1) is bonded to two equivalent O(4) and four equivalent O(2) atoms to form VO6 octahedra that share corners with two equivalent Si(2)O4 tetrahedra and corners with four equivalent Si(1)O4 tetrahedra. In the second V site, V(2) is bonded to two equivalent O(5), two equivalent O(6), and two equivalent O(7) atoms to form VO6 octahedra that share corners with two equivalent V(3)O6 octahedra, corners with two equivalent V(4)O6 octahedra, corners with two equivalent Si(2)O4 tetrahedra, and edges with two equivalent V(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-48°. In the third V site, V(3) is bonded to two equivalent O(6) and four equivalent O(8) atoms to form a mixture of corner and edge-sharing VO6 octahedra. The corner-sharing octahedral tilt angles are 47°. In the fourth V site, V(4) is bonded to two equivalent O(7) and four equivalent O(8) atoms to form a mixture of corner and edge-sharing VO6 octahedra. The corner-sharing octahedral tilt angles are 48°. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(3), and two equivalent O(2) atoms to form SiO4 tetrahedra that share corners with two equivalent V(1)O6 octahedra and  a cornercorner with one Si(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 44°. In the second Si site, Si(2) is bonded to one O(1), one O(4), and two equivalent O(5) atoms to form SiO4 tetrahedra that share  a cornercorner with one V(1)O6 octahedra, corners with two equivalent V(2)O6 octahedra, and  a cornercorner with one Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 35-54°. There are eight inequivalent O sites. In the first O site, O(3) is bonded in a distorted single-bond geometry to one La(1), one La(2), and one Si(1) atom. In the second O site, O(4) is bonded in a distorted bent 150 degrees geometry to two equivalent La(1), one V(1), and one Si(2) atom. In the third O site, O(5) is bonded in a 4-coordinate geometry to one La(1), one La(2), one V(2), and one Si(2) atom. In the fourth O site, O(6) is bonded in a 3-coordinate geometry to one La(2), one V(3), and two equivalent V(2) atoms. In the fifth O site, O(7) is bonded in a 4-coordinate geometry to one La(1), one V(4), and two equivalent V(2) atoms. In the sixth O site, O(8) is bonded in a distorted see-saw-like geometry to one La(1), one La(2), one V(3), and one V(4) atom. In the seventh O site, O(1) is bonded in a linear geometry to one Si(1) and one Si(2) atom. In the eighth O site, O(2) is bonded in a 4-coordinate geometry to one La(1), one La(2), one V(1), and one Si(1) atom.
La4V5(Si2O11)2 is Esseneite-like structured and crystallizes in the monoclinic C2/m space group. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 10-coordinate geometry to one O(3), one O(7), two equivalent O(2), two equivalent O(4), two equivalent O(5), and two equivalent O(8) atoms. The La(1)-O(3) bond length is 2.51 Å. The La(1)-O(7) bond length is 2.56 Å. Both La(1)-O(2) bond lengths are 2.76 Å. Both La(1)-O(4) bond lengths are 3.05 Å. Both La(1)-O(5) bond lengths are 2.56 Å. Both La(1)-O(8) bond lengths are 2.48 Å. In the second La site, La(2) is bonded in a 8-coordinate geometry to one O(3), one O(6), two equivalent O(2), two equivalent O(5), and two equivalent O(8) atoms. The La(2)-O(3) bond length is 2.55 Å. The La(2)-O(6) bond length is 2.74 Å. Both La(2)-O(2) bond lengths are 2.66 Å. Both La(2)-O(5) bond lengths are 2.56 Å. Both La(2)-O(8) bond lengths are 2.48 Å. There are four inequivalent V sites. In the first V site, V(1) is bonded to two equivalent O(4) and four equivalent O(2) atoms to form VO6 octahedra that share corners with two equivalent Si(2)O4 tetrahedra and corners with four equivalent Si(1)O4 tetrahedra. Both V(1)-O(4) bond lengths are 1.98 Å. All V(1)-O(2) bond lengths are 2.12 Å. In the second V site, V(2) is bonded to two equivalent O(5), two equivalent O(6), and two equivalent O(7) atoms to form VO6 octahedra that share corners with two equivalent V(3)O6 octahedra, corners with two equivalent V(4)O6 octahedra, corners with two equivalent Si(2)O4 tetrahedra, and edges with two equivalent V(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-48°. Both V(2)-O(5) bond lengths are 2.08 Å. Both V(2)-O(6) bond lengths are 2.00 Å. Both V(2)-O(7) bond lengths are 2.03 Å. In the third V site, V(3) is bonded to two equivalent O(6) and four equivalent O(8) atoms to form a mixture of corner and edge-sharing VO6 octahedra. The corner-sharing octahedral tilt angles are 47°. Both V(3)-O(6) bond lengths are 2.02 Å. All V(3)-O(8) bond lengths are 2.06 Å. In the fourth V site, V(4) is bonded to two equivalent O(7) and four equivalent O(8) atoms to form a mixture of corner and edge-sharing VO6 octahedra. The corner-sharing octahedral tilt angles are 48°. Both V(4)-O(7) bond lengths are 2.01 Å. All V(4)-O(8) bond lengths are 1.99 Å. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(3), and two equivalent O(2) atoms to form SiO4 tetrahedra that share corners with two equivalent V(1)O6 octahedra and  a cornercorner with one Si(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 44°. The Si(1)-O(1) bond length is 1.64 Å. The Si(1)-O(3) bond length is 1.61 Å. Both Si(1)-O(2) bond lengths are 1.66 Å. In the second Si site, Si(2) is bonded to one O(1), one O(4), and two equivalent O(5) atoms to form SiO4 tetrahedra that share  a cornercorner with one V(1)O6 octahedra, corners with two equivalent V(2)O6 octahedra, and  a cornercorner with one Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 35-54°. The Si(2)-O(1) bond length is 1.63 Å. The Si(2)-O(4) bond length is 1.61 Å. Both Si(2)-O(5) bond lengths are 1.64 Å. There are eight inequivalent O sites. In the first O site, O(3) is bonded in a distorted single-bond geometry to one La(1), one La(2), and one Si(1) atom. In the second O site, O(4) is bonded in a distorted bent 150 degrees geometry to two equivalent La(1), one V(1), and one Si(2) atom. In the third O site, O(5) is bonded in a 4-coordinate geometry to one La(1), one La(2), one V(2), and one Si(2) atom. In the fourth O site, O(6) is bonded in a 3-coordinate geometry to one La(2), one V(3), and two equivalent V(2) atoms. In the fifth O site, O(7) is bonded in a 4-coordinate geometry to one La(1), one V(4), and two equivalent V(2) atoms. In the sixth O site, O(8) is bonded in a distorted see-saw-like geometry to one La(1), one La(2), one V(3), and one V(4) atom. In the seventh O site, O(1) is bonded in a linear geometry to one Si(1) and one Si(2) atom. In the eighth O site, O(2) is bonded in a 4-coordinate geometry to one La(1), one La(2), one V(1), and one Si(1) atom.