Stellated Truncated Hexahedron

The Uniform Polyhedron $U_{19}$, also called the Quasitruncated Hexahedron, whose Dual Polyhedron is the Great Triakis Octahedron. It has Schläfli Symbol ${\rm t}^\prime\{4,3\}$ and Wythoff Symbol $2\,3\,\vert\,{\textstyle{4\over 3}}$. Its faces are $8\{3\}+6\{{\textstyle{8\over 3}}\}$. For $a=1$, its Circumradius is

$$R={\textstyle{1\over 2}}\sqrt{7-4\sqrt{2}}\,.$$

References

Wenninger, M. J. Polyhedron Models. Cambridge, England: Cambridge University Press, p. 144, 1989.