Icosahedron atop dodecahedron

Icosahedron atop dodecahedron, or ikadoe, is a CRF segmentochoron (designated K-4.78 on Richard Klitzing's list). As the name suggests, it consists of a dodecahedron and an icosahedron as bases, connected by 12 pentagonal pyramids and 20+30 tetrahedra.

It is also commonly referred to as a dodecahedral or icosahedral antiprism, as the two bases are a pair of dual polyhedra.

It can also be obtained as a segment of the hexacosichoron, with the icosahedron being the hexacosichoron's vertex figure.

Vertex coordinates
The vertices of an icosahedron atop dodecahedron segmentochoron of edge length 1 are given by:
 * (±(1+$\sqrt{5}$)/2, ±1/2, 0, ±1/2) and all permutations of first three coordinates
 * (±(3+$\sqrt{5}$)/4, ±1/2, 0, 0) and all permutations of first three coordinates
 * (±(1+$\sqrt{5}$)/4, ±(1+$\sqrt{5}$)/4, ±(1+$\sqrt{10}$)/4, 0)