Na8Al6Si6CO27 is Chalcostibite-derived structured and crystallizes in the trigonal R3 space group. There are four inequivalent Na sites. In the first Na site, Na(1) is bonded in a 5-coordinate geometry to one O(4), one O(5), one O(6), and two equivalent O(3) atoms. In the second Na site, Na(2) is bonded to one O(2), one O(3), one O(7), and one O(8) atom to form NaO4 tetrahedra that share  a cornercorner with one Al(2)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra, corners with two equivalent Al(1)O4 tetrahedra, and corners with two equivalent Si(2)O4 tetrahedra. In the third Na site, Na(3) is bonded in a trigonal non-coplanar geometry to three equivalent O(1) atoms. In the fourth Na site, Na(4) is bonded in a distorted trigonal non-coplanar geometry to three equivalent O(9) atoms. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(2), one O(4), one O(7), and one O(9) atom to form AlO4 tetrahedra that share corners with two equivalent Na(2)O4 tetrahedra, 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 one O(1), one O(5), one O(6), and one O(8) atom to form AlO4 tetrahedra that share  a cornercorner with one Na(2)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, and corners with two equivalent Si(2)O4 tetrahedra. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(4), one O(5), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Na(2)O4 tetrahedra, corners with two equivalent Al(1)O4 tetrahedra, and corners with two equivalent Al(2)O4 tetrahedra. In the second Si site, Si(2) is bonded to one O(2), one O(6), one O(8), and one O(9) atom to form SiO4 tetrahedra that share corners with two equivalent Na(2)O4 tetrahedra, corners with two equivalent Al(1)O4 tetrahedra, and corners with two equivalent Al(2)O4 tetrahedra. C(1) is bonded in a trigonal planar geometry to three equivalent O(3) atoms. There are nine inequivalent O sites. In the first O site, O(2) is bonded in a 3-coordinate geometry to one Na(2), one Al(1), and one Si(2) atom. In the second O site, O(3) is bonded in a 4-coordinate geometry to one Na(2), two equivalent Na(1), and one C(1) atom. In the third O site, O(4) is bonded in a 3-coordinate geometry to one Na(1), one Al(1), and one Si(1) atom. In the fourth O site, O(5) is bonded in a 3-coordinate geometry to one Na(1), one Al(2), and one Si(1) atom. In the fifth O site, O(6) is bonded in a 3-coordinate geometry to one Na(1), one Al(2), and one Si(2) atom. In the sixth O site, O(7) is bonded in a 3-coordinate geometry to one Na(2), one Al(1), and one Si(1) atom. In the seventh O site, O(8) is bonded in a 3-coordinate geometry to one Na(2), one Al(2), and one Si(2) atom. In the eighth O site, O(9) is bonded in a 3-coordinate geometry to one Na(4), one Al(1), and one Si(2) atom. In the ninth O site, O(1) is bonded in a distorted trigonal planar geometry to one Na(3), one Al(2), and one Si(1) atom.
Na8Al6Si6CO27 is Chalcostibite-derived structured and crystallizes in the trigonal R3 space group. There are four inequivalent Na sites. In the first Na site, Na(1) is bonded in a 5-coordinate geometry to one O(4), one O(5), one O(6), and two equivalent O(3) atoms. The Na(1)-O(4) bond length is 2.46 Å. The Na(1)-O(5) bond length is 2.41 Å. The Na(1)-O(6) bond length is 2.46 Å. Both Na(1)-O(3) bond lengths are 2.46 Å. In the second Na site, Na(2) is bonded to one O(2), one O(3), one O(7), and one O(8) atom to form NaO4 tetrahedra that share  a cornercorner with one Al(2)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra, corners with two equivalent Al(1)O4 tetrahedra, and corners with two equivalent Si(2)O4 tetrahedra. The Na(2)-O(2) bond length is 2.28 Å. The Na(2)-O(3) bond length is 2.25 Å. The Na(2)-O(7) bond length is 2.27 Å. The Na(2)-O(8) bond length is 2.27 Å. In the third Na site, Na(3) is bonded in a trigonal non-coplanar geometry to three equivalent O(1) atoms. All Na(3)-O(1) bond lengths are 2.27 Å. In the fourth Na site, Na(4) is bonded in a distorted trigonal non-coplanar geometry to three equivalent O(9) atoms. All Na(4)-O(9) bond lengths are 2.35 Å. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(2), one O(4), one O(7), and one O(9) atom to form AlO4 tetrahedra that share corners with two equivalent Na(2)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, and corners with two equivalent Si(2)O4 tetrahedra. The Al(1)-O(2) bond length is 1.74 Å. The Al(1)-O(4) bond length is 1.74 Å. The Al(1)-O(7) bond length is 1.74 Å. The Al(1)-O(9) bond length is 1.74 Å. In the second Al site, Al(2) is bonded to one O(1), one O(5), one O(6), and one O(8) atom to form AlO4 tetrahedra that share  a cornercorner with one Na(2)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, and corners with two equivalent Si(2)O4 tetrahedra. The Al(2)-O(1) bond length is 1.74 Å. The Al(2)-O(5) bond length is 1.74 Å. The Al(2)-O(6) bond length is 1.74 Å. The Al(2)-O(8) bond length is 1.74 Å. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(4), one O(5), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Na(2)O4 tetrahedra, corners with two equivalent Al(1)O4 tetrahedra, and corners with two equivalent Al(2)O4 tetrahedra. The Si(1)-O(1) bond length is 1.63 Å. The Si(1)-O(4) bond length is 1.62 Å. The Si(1)-O(5) bond length is 1.62 Å. The Si(1)-O(7) bond length is 1.62 Å. In the second Si site, Si(2) is bonded to one O(2), one O(6), one O(8), and one O(9) atom to form SiO4 tetrahedra that share corners with two equivalent Na(2)O4 tetrahedra, corners with two equivalent Al(1)O4 tetrahedra, and corners with two equivalent Al(2)O4 tetrahedra. The Si(2)-O(2) bond length is 1.63 Å. The Si(2)-O(6) bond length is 1.62 Å. The Si(2)-O(8) bond length is 1.62 Å. The Si(2)-O(9) bond length is 1.63 Å. C(1) is bonded in a trigonal planar geometry to three equivalent O(3) atoms. All C(1)-O(3) bond lengths are 1.30 Å. There are nine inequivalent O sites. In the first O site, O(2) is bonded in a 3-coordinate geometry to one Na(2), one Al(1), and one Si(2) atom. In the second O site, O(3) is bonded in a 4-coordinate geometry to one Na(2), two equivalent Na(1), and one C(1) atom. In the third O site, O(4) is bonded in a 3-coordinate geometry to one Na(1), one Al(1), and one Si(1) atom. In the fourth O site, O(5) is bonded in a 3-coordinate geometry to one Na(1), one Al(2), and one Si(1) atom. In the fifth O site, O(6) is bonded in a 3-coordinate geometry to one Na(1), one Al(2), and one Si(2) atom. In the sixth O site, O(7) is bonded in a 3-coordinate geometry to one Na(2), one Al(1), and one Si(1) atom. In the seventh O site, O(8) is bonded in a 3-coordinate geometry to one Na(2), one Al(2), and one Si(2) atom. In the eighth O site, O(9) is bonded in a 3-coordinate geometry to one Na(4), one Al(1), and one Si(2) atom. In the ninth O site, O(1) is bonded in a distorted trigonal planar geometry to one Na(3), one Al(2), and one Si(1) atom.