LiAlSiO4 crystallizes in the monoclinic P2 space group. There are three inequivalent Li sites. In the first Li site, Li(1) is bonded in a 4-coordinate geometry to two equivalent O(3) and two equivalent O(5) atoms. In the second Li site, Li(2) is bonded in a 4-coordinate geometry to two equivalent O(4) and two equivalent O(6) atoms. In the third Li site, Li(3) is bonded in a 4-coordinate geometry to two equivalent O(1) and two equivalent O(6) atoms. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded to two equivalent O(3) and two equivalent O(5) atoms to form AlO4 tetrahedra that share corners with two equivalent Si(1)O4 tetrahedra and corners with two equivalent Si(2)O4 tetrahedra. In the second Al site, Al(2) is bonded to two equivalent O(4) and two equivalent O(6) atoms to form AlO4 tetrahedra that share corners with two equivalent Al(3)O4 tetrahedra and corners with two equivalent Si(3)O4 tetrahedra. In the third Al site, Al(3) is bonded to two equivalent O(1) and two equivalent O(6) atoms to form AlO4 tetrahedra that share corners with two equivalent Al(2)O4 tetrahedra and corners with two equivalent Si(2)O4 tetrahedra. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded to two equivalent O(2) and two equivalent O(5) atoms to form SiO4 tetrahedra that share corners with two equivalent Al(1)O4 tetrahedra and corners with two equivalent Si(3)O4 tetrahedra. In the second Si site, Si(2) is bonded to two equivalent O(1) and two equivalent O(3) atoms to form SiO4 tetrahedra that share corners with two equivalent Al(1)O4 tetrahedra and corners with two equivalent Al(3)O4 tetrahedra. In the third Si site, Si(3) is bonded to two equivalent O(2) and two equivalent O(4) atoms to form SiO4 tetrahedra that share corners with two equivalent Al(2)O4 tetrahedra and corners with two equivalent Si(1)O4 tetrahedra. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Li(3), one Al(3), and one Si(2) atom. In the second O site, O(2) is bonded in a linear geometry to one Si(1) and one Si(3) atom. In the third O site, O(3) is bonded in a distorted T-shaped geometry to one Li(1), one Al(1), and one Si(2) atom. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Li(2), one Al(2), and one Si(3) atom. In the fifth O site, O(5) is bonded in a distorted T-shaped geometry to one Li(1), one Al(1), and one Si(1) atom. In the sixth O site, O(6) is bonded in a distorted rectangular see-saw-like geometry to one Li(2), one Li(3), one Al(2), and one Al(3) atom.
LiAlSiO4 crystallizes in the monoclinic P2 space group. There are three inequivalent Li sites. In the first Li site, Li(1) is bonded in a 4-coordinate geometry to two equivalent O(3) and two equivalent O(5) atoms. Both Li(1)-O(3) bond lengths are 2.04 Å. Both Li(1)-O(5) bond lengths are 2.00 Å. In the second Li site, Li(2) is bonded in a 4-coordinate geometry to two equivalent O(4) and two equivalent O(6) atoms. Both Li(2)-O(4) bond lengths are 1.96 Å. Both Li(2)-O(6) bond lengths are 2.05 Å. In the third Li site, Li(3) is bonded in a 4-coordinate geometry to two equivalent O(1) and two equivalent O(6) atoms. Both Li(3)-O(1) bond lengths are 2.01 Å. Both Li(3)-O(6) bond lengths are 2.06 Å. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded to two equivalent O(3) and two equivalent O(5) atoms to form AlO4 tetrahedra that share corners with two equivalent Si(1)O4 tetrahedra and corners with two equivalent Si(2)O4 tetrahedra. Both Al(1)-O(3) bond lengths are 1.75 Å. Both Al(1)-O(5) bond lengths are 1.76 Å. In the second Al site, Al(2) is bonded to two equivalent O(4) and two equivalent O(6) atoms to form AlO4 tetrahedra that share corners with two equivalent Al(3)O4 tetrahedra and corners with two equivalent Si(3)O4 tetrahedra. Both Al(2)-O(4) bond lengths are 1.78 Å. Both Al(2)-O(6) bond lengths are 1.76 Å. In the third Al site, Al(3) is bonded to two equivalent O(1) and two equivalent O(6) atoms to form AlO4 tetrahedra that share corners with two equivalent Al(2)O4 tetrahedra and corners with two equivalent Si(2)O4 tetrahedra. Both Al(3)-O(1) bond lengths are 1.76 Å. Both Al(3)-O(6) bond lengths are 1.75 Å. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded to two equivalent O(2) and two equivalent O(5) atoms to form SiO4 tetrahedra that share corners with two equivalent Al(1)O4 tetrahedra and corners with two equivalent Si(3)O4 tetrahedra. Both Si(1)-O(2) bond lengths are 1.63 Å. Both Si(1)-O(5) bond lengths are 1.64 Å. In the second Si site, Si(2) is bonded to two equivalent O(1) and two equivalent O(3) atoms to form SiO4 tetrahedra that share corners with two equivalent Al(1)O4 tetrahedra and corners with two equivalent Al(3)O4 tetrahedra. Both Si(2)-O(1) bond lengths are 1.63 Å. Both Si(2)-O(3) bond lengths are 1.64 Å. In the third Si site, Si(3) is bonded to two equivalent O(2) and two equivalent O(4) atoms to form SiO4 tetrahedra that share corners with two equivalent Al(2)O4 tetrahedra and corners with two equivalent Si(1)O4 tetrahedra. Both Si(3)-O(2) bond lengths are 1.64 Å. Both Si(3)-O(4) bond lengths are 1.62 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Li(3), one Al(3), and one Si(2) atom. In the second O site, O(2) is bonded in a linear geometry to one Si(1) and one Si(3) atom. In the third O site, O(3) is bonded in a distorted T-shaped geometry to one Li(1), one Al(1), and one Si(2) atom. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Li(2), one Al(2), and one Si(3) atom. In the fifth O site, O(5) is bonded in a distorted T-shaped geometry to one Li(1), one Al(1), and one Si(1) atom. In the sixth O site, O(6) is bonded in a distorted rectangular see-saw-like geometry to one Li(2), one Li(3), one Al(2), and one Al(3) atom.