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. In the process half the octagonal prisms blend into small rhombihexahedra.

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