Great retroinverted dodecahedronary hexacosihecatonicosachoron

The great retroinverted dodecahedronary hexacosihecatonicosachoron, or gridixhi, is a nonconvex uniform polychoron that consists of 120 small ditrigonary icosidodecahedra and 600 tetrahedra. Twenty small ditrigonary icosidodecahedra and twenty tetrahedra join at each vertex.

It also has great complex icosidodecahedra as exotic pseudofacets.

Vertex coordinates
Its vertices are the same as those of its regiment colonel, the small ditrigonary hexacosihecatonicosachoron.