Great diretrosnub snub prismatosnub pentishecatonicosipentishexacosichoron

The great diretrosnub snub prismatosnub pentishecatonicosipentishexacosichoron, or gadersospis phipix, is a nonconvex uniform polychoron that consists of 1200 great icosahedra (falling into pairs in the same hyperplanes, forming 600 small retrosnub disoctahedra), 4800 octahemioctahedra (forming 2400 compounds of two), 600 truncated great icosahedra, 600 quasirhombicosidodecahedra, 3600 pentagonal prisms, and 3000 truncated tetrahedra (600 of which form 120 truncated chiricosahedra).

Two great icosahedra (two compounds), eight octahemioctahedra (eight compounds), five truncated great icosahedra, five quasirhombicosidodecahedra, five pentagonal prisms, and five truncated tetrahedra (one compound and four single) join at each vertex.

It can be obtained as the blend of 5 great dipentary hecatonicosidishexacosichora and 5 great dipentary tetrishecatonicosiprismatohexacosichora. In the process, some of the octahemioctahedron cells blend out.

Vertex coordinates
Its vertices are the same as those of its regiment colonel, the great diretrosnub disnub decahecatonicosadishexacosichoron.