Cantellated 120-cell

In four-dimensional geometry, a cantellated 120-cell is a convex uniform 4-polytope, being a cantellation (a 2nd order truncation) of the regular 120-cell.

There are four degrees of cantellations of the 120-cell including with permutations truncations. Two are expressed relative to the dual 600-cell.

Cantellated 120-cell


The cantellated 120-cell is a uniform 4-polytope. It is named by its construction as a Cantellation operation applied to the regular 120-cell. It contains 1920 cells, including 120 rhombicosidodecahedra, 1200 triangular prisms, 600 octahedra. Its vertex figure is a wedge, with two rhombicosidodecahedra, two triangular prisms, and one octahedron meeting at each vertex.

Alternative names

 * Cantellated 120-cell Norman Johnson
 * Cantellated hecatonicosachoron / Cantellated dodecacontachoron / Cantellated polydodecahedron
 * Small rhombated hecatonicosachoron (Acronym srahi) (George Olshevsky and Jonathan Bowers)
 * Ambo-02 polydodecahedron (John Conway)

Cantitruncated 120-cell
The cantitruncated 120-cell polychoron is a uniform polychoron.

This 4-polytope is related to the regular 120-cell. The cantitruncation operation create new truncated tetrahedral cells at the vertices, and triangular prisms at the edges. The original dodecahedron cells are cantitruncated into great rhombicosidodecahedron cells.

The image shows the 4-polytope drawn as a Schlegel diagram, which projects the 4-dimensional figure into 3-space, distorting the sizes of the cells. In addition, the decagonal faces are hidden, allowing us to see the elemented projected inside.

Alternative names

 * Cantitruncated 120-cell Norman Johnson
 * Cantitruncated hecatonicosachoron / Cantitruncated polydodecahedron
 * Great rhombated hecatonicosachoron (Acronym grahi) (George Olshevsky and Jonthan Bowers)
 * Ambo-012 polydodecahedron (John Conway)

Cantellated 600-cell
The cantellated 600-cell is a uniform 4-polytope. It has 1440 cells: 120 icosidodecahedra, 600 cuboctahedra, and 720 pentagonal prisms. Its vertex figure is an isosceles triangular prism, defined by one icosidodecahedron, two cuboctahedra, and two pentagonal prisms.

Alternative names

 * Cantellated 600-cell Norman Johnson
 * Cantellated hexacosichoron / Cantellated tetraplex
 * Small rhombihexacosichoron (Acronym srix) (George Olshevsky and Jonathan Bowers)
 * Ambo-02 tetraplex (John Conway)

Construction
This 4-polytope has cells at 3 of 4 positions in the fundamental domain, extracted from the Coxeter diagram by removing one node at a time:

There are 1440 pentagonal faces between the icosidodecahedra and pentagonal prisms. There are 3600 squares between the cuboctahedra and pentagonal prisms. There are 2400 triangular faces between the icosidodecahedra and cuboctahedra, and 1200 triangular faces between pairs of cuboctahedra.

There are two classes of edges: 3-4-4, 3-4-5: 3600 have two squares and a triangle around it, and 7200 have one triangle, one square, and one pentagon.

Cantitruncated 600-cell
The cantitruncated 600-cell is a uniform 4-polytope. It is composed of 1440 cells: 120 truncated icosahedra, 720 pentagonal prisms and 600 truncated octahedra. It has 7200 vertices, 14400 edges, and 8640 faces (3600 squares, 1440 pentagons, and 3600 hexagons). It has an irregular tetrahedral vertex figure, filled by one truncated icosahedron, one pentagonal prism and two truncated octahedra.

Alternative names

 * Cantitruncated 600-cell (Norman Johnson)
 * Cantitruncated hexacosichoron / Cantitruncated polydodecahedron
 * Great rhombated hexacosichoron (acronym grix) (George Olshevsky and Jonathan Bowers)
 * Ambo-012 polytetrahedron (John Conway)