The chamfered dodecahedron is a convex polyhedron with 80 vertices, 120 edges, and 42 faces: 30 hexagons and 12 pentagons. It is constructed as a chamfer of a regular dodecahedron. The pentagons are reduced in size and new hexagonal faces are added in place of all the original edges. Its dual is the pentakis icosidodecahedron. It is also called a truncated rhombic triacontahedron, constructed as a truncation of the rhombic triacontahedron. It can more accurately be called an order-5 truncated rhombic triacontahedron because only the order-5 vertices are truncated.
Structure
These 12 order-5 vertices can be truncated such that all edges are equal length. The original 30 rhombic faces become non-regular hexagons, and the truncated vertices become regular pentagons. The hexagon faces can be equilateral but not regular with D2 symmetry. The angles at the two vertices with vertex configuration6.6.6 are arccos = 116.565°, and at the remaining four vertices with 5.6.6, they are 121.717° each. It is the Goldberg polyhedron GV, containing pentagonal and hexagonal faces. It also represents the exterior envelope of a cell-centered orthogonal projection of the 120-cell, one of six.
Chemistry
This is the shape of the fullerene C80 ; sometimes this shape is denoted C80 to describe its icosahedral symmetry and distinguish it from other less-symmetric 80-vertex fullerenes. It is one of only four fullerenes found by to have a skeleton that can be isometrically embeddable into an L1 space.
Related polyhedra
This polyhedronlooks very similar to the uniform truncated icosahedron which has 12 pentagons, but only 20 hexagons. The chamfered dodecahedron creates more polyhedra by basicConway polyhedron notation. The zip chamfered dodecahedron makes a chamfered truncated icosahedron, and Goldberg.
In geometry, the chamfered truncated icosahedron is a convex polyhedron with 240 vertices, 360 edges, and 122 faces, 110 hexagons and 12 pentagons. It is constructed by a chamfer operation to the truncated icosahedron, adding new hexagons in place of original edges. It can also be constructed as a zip operation from the chamfered dodecahedron. In other words, raising pentagonal and hexagonal pyramids on a chamfered dodecahedron will yield the geodesic polyhedron. Taking the dual of that yields the Goldberg polyhedron, which is the chamfered truncated icosahedron, and is also Fullerene C240.
Dual
Its dual, the hexapentakis chamfered dodecahedron has 240 triangle faces, 60, 360 edges, and 122 vertices.
