Truncating edges down to points produces the octahedron as a rectified tetrahedron. The figures below show some stellations of the regular octahedron, dodecahedron, and icosahedron. The compound figure comprising two such dual tetrahedra form a stellated octahedron or stella octangula. A polyhedron with eight faces is an octahedron. A regular octahedron is the dual polyhedron of a cube. Adding tetrahedra to all 8 faces creates the stellated octahedron. The cuboctahedron is a rectified cube and also a rectified octahedron. The minimum composition is two regular tetrahedrons along with an octahedron. These coordinates represent the truncated octahedron with alternated vertices deleted. The surrounding ions are located at the vertices of a regular octahedron. It can also be constructed as an alternated truncated octahedron, having pyritohedral symmetry. Its vertex figure is a regular octahedron. This can be seen as an alternated truncated octahedron. This was followed by a DNA truncated octahedron. The smallest scalenohedron has 8 faces and is topologically identical to the regular octahedron.