20-6 step prism

The 20-6 step prism is a convex isogonal polychoron, member of the step prism family. It has 10 rhombic disphenoids and 80 phyllic disphenoids of four kinds as cells.

Vertex coordinates
Coordinates for the vertices of a 20-6 step prism inscribed in a heptagonal duoprism with base lengths a and b are given by: where k is an integer from 0 to 19. If the edge length differences are to be minimized, the ratio of a:b must be equivalent to 1:1.
 * (a*sin(2πk/20), a*cos(2πk/20), b*sin(12πk/20), b*cos(12πk/20)),