Great retrofrustary hexacositrishecatonicosachoron

The great retrofrustary hexacositrishecatonicosachoron, or girfixthi, is a nonconvex uniform polychoron that consists of 600 octahedra, 120 dodecadodecahedra, 120 great icosicosidodecahedra, and 120 small icosicosidodecahedra. 1 octahedron, 1 dodecadodecahedron, 2 great icosicosidodecahedra, and 2 small icosicosidodecahedra join at each vertex.

Vertex coordinates
Its vertices are the same as those of its regiment colonel, the antifrustary hexacositrishecatonicosachoron.