Great retrotetracontoctachoron

The great retrotetracontoctachoron, or girc, is a nonconvex noble uniform polychoron that consists of 48 great rhombihexahedra. Eight great rhombihexahedra join at each vertex.

It can be constructed as a blend of 9 octagrammic duoprisms.

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