KAlSiO4 crystallizes in the trigonal P31c space group. K(1) is bonded in a 9-coordinate geometry to three equivalent O(1) and six equivalent O(2) atoms. Al(1) is bonded to one O(1) and three equivalent O(2) atoms to form AlO4 tetrahedra that share corners with four equivalent Si(1)O4 tetrahedra. Si(1) is bonded to one O(1) and three equivalent O(2) atoms to form SiO4 tetrahedra that share corners with four equivalent Al(1)O4 tetrahedra. There are two inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to three equivalent K(1), one Al(1), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to two equivalent K(1), one Al(1), and one Si(1) atom.
KAlSiO4 crystallizes in the trigonal P31c space group. K(1) is bonded in a 9-coordinate geometry to three equivalent O(1) and six equivalent O(2) atoms. All K(1)-O(1) bond lengths are 3.02 Å. There are three shorter (2.98 Å) and three longer (3.03 Å) K(1)-O(2) bond lengths. Al(1) is bonded to one O(1) and three equivalent O(2) atoms to form AlO4 tetrahedra that share corners with four equivalent Si(1)O4 tetrahedra. The Al(1)-O(1) bond length is 1.75 Å. All Al(1)-O(2) bond lengths are 1.76 Å. Si(1) is bonded to one O(1) and three equivalent O(2) atoms to form SiO4 tetrahedra that share corners with four equivalent Al(1)O4 tetrahedra. The Si(1)-O(1) bond length is 1.63 Å. All Si(1)-O(2) bond lengths are 1.64 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to three equivalent K(1), one Al(1), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to two equivalent K(1), one Al(1), and one Si(1) atom.