Heptagonal-great heptagrammic duoprism

The heptagonal-great heptagrammic duoprism, also known as hegishdip or the 7-7/3 duoprism, is a uniform duoprism that consists of 7 heptagonal prisms and 7 great heptagrammic prisms, with 2 of each at each vertex.

Vertex coordinates
The coordinates of a heptagonal-great heptagrammic duoprism, centered at the origin and with edge length 4sin(π/7)sin(3π/7), are given by: where j, k = 2, 4, 6.
 * $$\left(2\sin\frac{3\pi}7,\,0,\,2\sin\frac{\pi}7,\,0\right),$$
 * $$\left(2\sin\frac{3\pi}7,\,0,\,2\sin\frac{\pi}7\cos\left(\frac{k\pi}7\right),\,±2\sin\frac{\pi}7\sin\left(\frac{k\pi}7\right)\right),$$
 * $$\left(2\sin\frac{3\pi}7\cos\left(\frac{j\pi}7\right),\,±2\sin\frac{3\pi}7\sin\left(\frac{j\pi}7\right),\,2\sin\frac{\pi}7,\,0\right),$$
 * $$\left(2\sin\frac{3\pi}7\cos\left(\frac{j\pi}7\right),\,±2\sin\frac{3\pi}7\sin\left(\frac{j\pi}7\right),\,2\sin\frac{\pi}7\cos\left(\frac{k\pi}7\right),\,±2\sin\frac{\pi}7\sin\left(\frac{k\pi}7\right)\right),$$