Small rhombiprismic tesseractihexadecachoron

The small rhombiprismic tesseractihexadecachoron, or sirpith, is a nonconvex uniform polychoron that consists of 16 cubohemioctahedra, 24 octagonal prisms, and 8 great rhombicuboctahedra. One cubohemioctahedron, two octagonal prisms, and two great rhombicuboctahedra join at each vertex.

3 copies of this polychoron can blend to form the grand rhombic disicositetrachoron, with the cubohemioctahedron cells blending out and the octagonal prisms blending into.

Vertex coordinates
Its vertices are the same as those of its regiment colonel, the prismatorhombated hexadecachoron.