Cubic tegum

The cubic bipyramid is a convex isochoric polychoron with 12 square pyramids as cells. This polychoron can be made CRF.

Vertex coordinates
Coordinates for the vertices of a cubic bipyramid of edge length 1 are given by:
 * (±1/2, ±1/2, ±1/2, 0),
 * (0, 0, 0, ±1/2).