Small retrotetracontoctachoron

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

It can be constructed as a blend of a compound of either 9 octagonal duoprisms or 3 grand rhombic prismatotesseracts.

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