Heptagonal duoprism

The heptagonal duoprism or hedip, also known as the heptagonal-heptagonal duoprism, the 7 duoprism or the 7-7 duoprism, is a noble uniform duoprism that consists of 14 heptagonal prisms, with 4 joining at each vertex. It is also the 14-6 gyrochoron. It is the first in an infinite family of isogonal heptagonal dihedral swirlchora and also the first in an infinite family of isochoric heptagonal hosohedral swirlchora.

Vertex coordinates
The coordinates of a heptagonal duoprism, centered at the origin and with edge length 2sin(π/7), are given by: where j, k = 2, 4, 6.
 * $$\left(1,0,1,0\right),$$
 * $$\left(1,0,\cos\left(\frac{j\pi}7\right),±\sin\left(\frac{j\pi}7\right)\right),$$
 * $$\left(\cos\left(\frac{k\pi}7\right),±\sin\left(\frac{k\pi}7\right),1,0\right),$$
 * $$\left(\cos\left(\frac{k\pi}7\right),±\sin\left(\frac{k\pi}7\right),\cos\left(\frac{j\pi}7\right),±\sin\left(\frac{j\pi}7\right)\right),$$