Grand rhombic prismatotesseract

The grand rhombic prismatotesseract, or garpit, is a nonconvex uniform polychoron that consists of 8 small rhombihexahedra and 24 octagonal prisms. Two small rhombihexahedra and four octagonal prisms join at each vertex.

It can be constructed as a blend of three octagonal duoprisms.

Vertex coordinates
The vertices are the same as those of the regiment colonel, the small rhombated tesseract.