Great diretrosnub snub pentishecatonicosidishexacositrishexacosichoron

The great diretrosnub snub pentishecatonicosidishexacositrishexacosichoron, or gadros sphidixtix, is a nonconvex uniform polychoron that consists of 1200 great icosahedra (falling into pairs in the same hyperplanes, forming 600 small retrosnub disoctahedra), 600 great dodecahedra, 4800 octahemioctahedra (forming 2400 compounds of two), 600 icosidodecadodecahedra, 600 great dodecicosidodecahedra, and 3000 truncated tetrahedra (600 of which form 120 truncated chiricosahedra).

Two great icosahedra (two compounds), one great dodecahedron, eight octahemioctahedra (eight compounds), five icosidodecadodecahedra, five great dodecicosidodecahedra, 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 tetrishecatonicosihexacosichora. 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.