Na3CaAl3Si3CO15 crystallizes in the hexagonal P6_3 space group. Na(1) is bonded in a 5-coordinate geometry to one O(1), two equivalent O(2), and two equivalent O(3) atoms. Ca(1) is bonded in a 4-coordinate geometry to one C(1) and three equivalent O(1) atoms. Al(1) is bonded to one O(2), one O(3), one O(4), and one O(5) atom to form AlO4 tetrahedra that share corners with four equivalent Si(1)O4 tetrahedra. Si(1) is bonded to one O(2), one O(3), one O(4), and one O(5) atom to form SiO4 tetrahedra that share corners with four equivalent Al(1)O4 tetrahedra. C(1) is bonded in a distorted trigonal planar geometry to one Ca(1) and three equivalent O(1) atoms. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Na(1), one Ca(1), and one C(1) atom. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Na(1), one Al(1), and one Si(1) atom. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Na(1), one Al(1), and one Si(1) atom. In the fourth O site, O(4) is bonded in a linear geometry to one Al(1) and one Si(1) atom. In the fifth O site, O(5) is bonded in a linear geometry to one Al(1) and one Si(1) atom.
Na3CaAl3Si3CO15 crystallizes in the hexagonal P6_3 space group. Na(1) is bonded in a 5-coordinate geometry to one O(1), two equivalent O(2), and two equivalent O(3) atoms. The Na(1)-O(1) bond length is 2.15 Å. There is one shorter (2.32 Å) and one longer (2.52 Å) Na(1)-O(2) bond length. There is one shorter (2.33 Å) and one longer (2.53 Å) Na(1)-O(3) bond length. Ca(1) is bonded in a 4-coordinate geometry to one C(1) and three equivalent O(1) atoms. The Ca(1)-C(1) bond length is 2.22 Å. All Ca(1)-O(1) bond lengths are 2.43 Å. Al(1) is bonded to one O(2), one O(3), one O(4), and one O(5) atom to form AlO4 tetrahedra that share corners with four equivalent Si(1)O4 tetrahedra. The Al(1)-O(2) bond length is 1.85 Å. The Al(1)-O(3) bond length is 1.84 Å. The Al(1)-O(4) bond length is 1.72 Å. The Al(1)-O(5) bond length is 1.72 Å. Si(1) is bonded to one O(2), one O(3), one O(4), and one O(5) atom to form SiO4 tetrahedra that share corners with four equivalent Al(1)O4 tetrahedra. The Si(1)-O(2) bond length is 1.69 Å. The Si(1)-O(3) bond length is 1.70 Å. The Si(1)-O(4) bond length is 1.61 Å. The Si(1)-O(5) bond length is 1.60 Å. C(1) is bonded in a distorted trigonal planar geometry to one Ca(1) and three equivalent O(1) atoms. All C(1)-O(1) bond lengths are 1.29 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Na(1), one Ca(1), and one C(1) atom. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Na(1), one Al(1), and one Si(1) atom. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Na(1), one Al(1), and one Si(1) atom. In the fourth O site, O(4) is bonded in a linear geometry to one Al(1) and one Si(1) atom. In the fifth O site, O(5) is bonded in a linear geometry to one Al(1) and one Si(1) atom.