Heptagrammic-octagrammic duoprism

The heptagrammic-octagrammic duoprism, also known as shestodip or the 7/2-8/3 duoprism, is a uniform duoprism that consists of 8 heptagrammic prisms and 7 octagrammic prisms, with 2 of each at each vertex.

The name can also refer to the great heptagrammic-octagrammic duoprism.

Vertex coordinates
The coordinates of a heptagrammic-octagrammic duoprism, centered at the origin and with edge length 2sin(2π/7), are given by: where j = 2, 4, 6.
 * $$\left(1,\,0,\,±\sin\frac{2\pi}{7},\,±\left(\sqrt2-1\right)\sin\frac{2\pi}{7}\right),$$
 * $$\left(1,\,0,\,±\left(\sqrt2-1\right)\sin\frac{2\pi}{7},\,±\sin\frac{2\pi}{7}\right),$$
 * $$\left(\cos\left(\frac{j\pi}{7}\right),\,±\sin\left(\frac{j\pi}{7}\right),\,±\sin\frac{2\pi}{7},\,±\left(\sqrt2-1\right)\sin\frac{2\pi}{7}\right),$$
 * $$\left(\cos\left(\frac{j\pi}{7}\right),\,±\sin\left(\frac{j\pi}{7}\right),\,±\left(\sqrt2-1\right)\sin\frac{2\pi}{7},\,±\sin\frac{2\pi}{7}\right),$$