K6Na3Ti2Al2Si8O26Cl3 is Esseneite-derived structured and crystallizes in the triclinic P-1 space group. There are three inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(4), one O(8), two equivalent O(6), one Cl(1), and one Cl(2) atom. In the second K site, K(2) is bonded in a 8-coordinate geometry to one O(2), one O(3), one O(7), one O(9), two equivalent O(5), one Cl(1), and one Cl(2) atom. In the third K site, K(3) is bonded in a 7-coordinate geometry to one O(1), one O(11), one O(2), one O(3), one O(4), one Cl(1), and one Cl(2) atom. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(10), one O(12), one O(13), one O(9), and two equivalent Cl(1) atoms to form distorted NaCl2O4 octahedra that share corners with two equivalent Na(2)Cl2O4 octahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  an edgeedge with one Na(1)Cl2O4 octahedra,  an edgeedge with one Ti(1)O6 octahedra, and  an edgeedge with one Ti(2)O6 octahedra. The corner-sharing octahedral tilt angles are 66°. In the second Na site, Na(2) is bonded to two equivalent O(7), two equivalent O(8), and two equivalent Cl(1) atoms to form distorted NaCl2O4 octahedra that share corners with four equivalent Na(1)Cl2O4 octahedra, corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and edges with two equivalent Al(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 66°. There are two inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to two equivalent O(1), two equivalent O(10), and two equivalent O(13) atoms to form TiO6 octahedra that share corners with two equivalent Si(2)O4 tetrahedra, corners with two equivalent Si(3)O4 tetrahedra, corners with two equivalent Si(4)O4 tetrahedra, and edges with two equivalent Na(1)Cl2O4 octahedra. In the second Ti site, Ti(2) is bonded to two equivalent O(12), two equivalent O(2), and two equivalent O(9) atoms to form TiO6 octahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(3)O4 tetrahedra, corners with two equivalent Si(4)O4 tetrahedra, and edges with two equivalent Na(1)Cl2O4 octahedra. Al(1) is bonded to one O(5), one O(6), one O(7), and one O(8) atom to form AlO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, and  an edgeedge with one Na(2)Cl2O4 octahedra. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(11), one O(12), one O(3), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Na(1)Cl2O4 octahedra,  a cornercorner with one Na(2)Cl2O4 octahedra,  a cornercorner with one Ti(2)O6 octahedra,  a cornercorner with one Al(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, and  a cornercorner with one Si(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 48-68°. In the second Si site, Si(2) is bonded to one O(11), one O(13), one O(4), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Na(1)Cl2O4 octahedra,  a cornercorner with one Na(2)Cl2O4 octahedra,  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Al(1)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra, and  a cornercorner with one Si(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 48-68°. In the third Si site, Si(3) is bonded to one O(1), one O(3), one O(5), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Na(1)Cl2O4 octahedra,  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Ti(2)O6 octahedra,  a cornercorner with one Al(1)O4 tetrahedra, and  a cornercorner with one Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 44-67°. In the fourth Si site, Si(4) is bonded to one O(10), one O(2), one O(4), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Na(1)Cl2O4 octahedra,  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Ti(2)O6 octahedra,  a cornercorner with one Al(1)O4 tetrahedra, and  a cornercorner with one Si(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 44-67°. There are thirteen inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one K(1), one K(3), one Ti(1), and one Si(3) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to one K(2), one K(3), one Ti(2), and one Si(4) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one K(2), one K(3), one Si(1), and one Si(3) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one K(1), one K(3), one Si(2), and one Si(4) atom. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to two equivalent K(2), one Al(1), and one Si(3) atom. In the sixth O site, O(6) is bonded in a distorted bent 150 degrees geometry to two equivalent K(1), one Al(1), and one Si(4) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one K(2), one Na(2), one Al(1), and one Si(1) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one K(1), one Na(2), one Al(1), and one Si(2) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one K(2), one Na(1), one Ti(2), and one Si(3) atom. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one K(1), one Na(1), one Ti(1), and one Si(4) atom. In the eleventh O site, O(11) is bonded in a distorted bent 150 degrees geometry to one K(3), one Si(1), and one Si(2) atom. In the twelfth O site, O(12) is bonded in a distorted trigonal planar geometry to one Na(1), one Ti(2), and one Si(1) atom. In the thirteenth O site, O(13) is bonded in a 3-coordinate geometry to one Na(1), one Ti(1), and one Si(2) atom. There are two inequivalent Cl sites. In the first Cl site, Cl(1) is bonded to one K(1), one K(2), one K(3), one Na(2), and two equivalent Na(1) atoms to form distorted ClK3Na3 octahedra that share  a cornercorner with one Cl(1)K3Na3 octahedra,  an edgeedge with one Cl(1)K3Na3 octahedra, and  a faceface with one Cl(2)K6 octahedra. The corner-sharing octahedra are not tilted. In the second Cl site, Cl(2) is bonded to two equivalent K(1), two equivalent K(2), and two equivalent K(3) atoms to form distorted face-sharing ClK6 octahedra.
K6Na3Ti2Al2Si8O26Cl3 is Esseneite-derived structured and crystallizes in the triclinic P-1 space group. There are three inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(4), one O(8), two equivalent O(6), one Cl(1), and one Cl(2) atom. The K(1)-O(1) bond length is 2.91 Å. The K(1)-O(10) bond length is 2.95 Å. The K(1)-O(4) bond length is 3.23 Å. The K(1)-O(8) bond length is 2.99 Å. There is one shorter (2.82 Å) and one longer (2.90 Å) K(1)-O(6) bond length. The K(1)-Cl(1) bond length is 3.12 Å. The K(1)-Cl(2) bond length is 3.17 Å. In the second K site, K(2) is bonded in a 8-coordinate geometry to one O(2), one O(3), one O(7), one O(9), two equivalent O(5), one Cl(1), and one Cl(2) atom. The K(2)-O(2) bond length is 2.91 Å. The K(2)-O(3) bond length is 3.23 Å. The K(2)-O(7) bond length is 3.00 Å. The K(2)-O(9) bond length is 2.95 Å. There is one shorter (2.82 Å) and one longer (2.90 Å) K(2)-O(5) bond length. The K(2)-Cl(1) bond length is 3.12 Å. The K(2)-Cl(2) bond length is 3.17 Å. In the third K site, K(3) is bonded in a 7-coordinate geometry to one O(1), one O(11), one O(2), one O(3), one O(4), one Cl(1), and one Cl(2) atom. The K(3)-O(1) bond length is 3.08 Å. The K(3)-O(11) bond length is 3.18 Å. The K(3)-O(2) bond length is 3.34 Å. The K(3)-O(3) bond length is 2.97 Å. The K(3)-O(4) bond length is 3.15 Å. The K(3)-Cl(1) bond length is 3.27 Å. The K(3)-Cl(2) bond length is 3.24 Å. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(10), one O(12), one O(13), one O(9), and two equivalent Cl(1) atoms to form distorted NaCl2O4 octahedra that share corners with two equivalent Na(2)Cl2O4 octahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  an edgeedge with one Na(1)Cl2O4 octahedra,  an edgeedge with one Ti(1)O6 octahedra, and  an edgeedge with one Ti(2)O6 octahedra. The corner-sharing octahedral tilt angles are 66°. The Na(1)-O(10) bond length is 2.46 Å. The Na(1)-O(12) bond length is 2.44 Å. The Na(1)-O(13) bond length is 2.44 Å. The Na(1)-O(9) bond length is 2.45 Å. Both Na(1)-Cl(1) bond lengths are 2.86 Å. In the second Na site, Na(2) is bonded to two equivalent O(7), two equivalent O(8), and two equivalent Cl(1) atoms to form distorted NaCl2O4 octahedra that share corners with four equivalent Na(1)Cl2O4 octahedra, corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and edges with two equivalent Al(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 66°. Both Na(2)-O(7) bond lengths are 2.37 Å. Both Na(2)-O(8) bond lengths are 2.37 Å. Both Na(2)-Cl(1) bond lengths are 3.12 Å. There are two inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to two equivalent O(1), two equivalent O(10), and two equivalent O(13) atoms to form TiO6 octahedra that share corners with two equivalent Si(2)O4 tetrahedra, corners with two equivalent Si(3)O4 tetrahedra, corners with two equivalent Si(4)O4 tetrahedra, and edges with two equivalent Na(1)Cl2O4 octahedra. Both Ti(1)-O(1) bond lengths are 1.98 Å. Both Ti(1)-O(10) bond lengths are 1.98 Å. Both Ti(1)-O(13) bond lengths are 1.98 Å. In the second Ti site, Ti(2) is bonded to two equivalent O(12), two equivalent O(2), and two equivalent O(9) atoms to form TiO6 octahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(3)O4 tetrahedra, corners with two equivalent Si(4)O4 tetrahedra, and edges with two equivalent Na(1)Cl2O4 octahedra. Both Ti(2)-O(12) bond lengths are 1.98 Å. Both Ti(2)-O(2) bond lengths are 1.98 Å. Both Ti(2)-O(9) bond lengths are 1.98 Å. Al(1) is bonded to one O(5), one O(6), one O(7), and one O(8) atom to form AlO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, and  an edgeedge with one Na(2)Cl2O4 octahedra. The Al(1)-O(5) bond length is 1.75 Å. The Al(1)-O(6) bond length is 1.75 Å. The Al(1)-O(7) bond length is 1.77 Å. The Al(1)-O(8) bond length is 1.76 Å. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(11), one O(12), one O(3), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Na(1)Cl2O4 octahedra,  a cornercorner with one Na(2)Cl2O4 octahedra,  a cornercorner with one Ti(2)O6 octahedra,  a cornercorner with one Al(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, and  a cornercorner with one Si(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 48-68°. The Si(1)-O(11) bond length is 1.64 Å. The Si(1)-O(12) bond length is 1.62 Å. The Si(1)-O(3) bond length is 1.66 Å. The Si(1)-O(7) bond length is 1.63 Å. In the second Si site, Si(2) is bonded to one O(11), one O(13), one O(4), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Na(1)Cl2O4 octahedra,  a cornercorner with one Na(2)Cl2O4 octahedra,  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Al(1)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra, and  a cornercorner with one Si(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 48-68°. The Si(2)-O(11) bond length is 1.64 Å. The Si(2)-O(13) bond length is 1.62 Å. The Si(2)-O(4) bond length is 1.65 Å. The Si(2)-O(8) bond length is 1.63 Å. In the third Si site, Si(3) is bonded to one O(1), one O(3), one O(5), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Na(1)Cl2O4 octahedra,  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Ti(2)O6 octahedra,  a cornercorner with one Al(1)O4 tetrahedra, and  a cornercorner with one Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 44-67°. The Si(3)-O(1) bond length is 1.63 Å. The Si(3)-O(3) bond length is 1.67 Å. The Si(3)-O(5) bond length is 1.64 Å. The Si(3)-O(9) bond length is 1.63 Å. In the fourth Si site, Si(4) is bonded to one O(10), one O(2), one O(4), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Na(1)Cl2O4 octahedra,  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Ti(2)O6 octahedra,  a cornercorner with one Al(1)O4 tetrahedra, and  a cornercorner with one Si(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 44-67°. The Si(4)-O(10) bond length is 1.64 Å. The Si(4)-O(2) bond length is 1.63 Å. The Si(4)-O(4) bond length is 1.67 Å. The Si(4)-O(6) bond length is 1.64 Å. There are thirteen inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one K(1), one K(3), one Ti(1), and one Si(3) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to one K(2), one K(3), one Ti(2), and one Si(4) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one K(2), one K(3), one Si(1), and one Si(3) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one K(1), one K(3), one Si(2), and one Si(4) atom. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to two equivalent K(2), one Al(1), and one Si(3) atom. In the sixth O site, O(6) is bonded in a distorted bent 150 degrees geometry to two equivalent K(1), one Al(1), and one Si(4) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one K(2), one Na(2), one Al(1), and one Si(1) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one K(1), one Na(2), one Al(1), and one Si(2) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one K(2), one Na(1), one Ti(2), and one Si(3) atom. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one K(1), one Na(1), one Ti(1), and one Si(4) atom. In the eleventh O site, O(11) is bonded in a distorted bent 150 degrees geometry to one K(3), one Si(1), and one Si(2) atom. In the twelfth O site, O(12) is bonded in a distorted trigonal planar geometry to one Na(1), one Ti(2), and one Si(1) atom. In the thirteenth O site, O(13) is bonded in a 3-coordinate geometry to one Na(1), one Ti(1), and one Si(2) atom. There are two inequivalent Cl sites. In the first Cl site, Cl(1) is bonded to one K(1), one K(2), one K(3), one Na(2), and two equivalent Na(1) atoms to form distorted ClK3Na3 octahedra that share  a cornercorner with one Cl(1)K3Na3 octahedra,  an edgeedge with one Cl(1)K3Na3 octahedra, and  a faceface with one Cl(2)K6 octahedra. The corner-sharing octahedra are not tilted. In the second Cl site, Cl(2) is bonded to two equivalent K(1), two equivalent K(2), and two equivalent K(3) atoms to form distorted face-sharing ClK6 octahedra.