15-4 step prism

The 15-4 step prism is a convex isogonal polychoron, member of the step prism family. It has 60 phyllic disphenoids of two kinds as cells. Together with its dual, it is the fourth in an infinite family of triangular dihedral swirlchora.

Vertex coordinates
Coordinates for the vertices of a 15-4 step prism of circumradius $\sqrt{2}$ are given by: where k is an integer from 0 to 14.
 * (sin(2πk/15), cos(2πk/15), sin(8πk/15), cos(8πk/15)),