Small inverted retrosnub icosicosidodecahedral prism

The small inverted retrosnub icosicosidodecahedral prism or sirsiddip is a prismatic uniform polychoron that consists of 2 small inverted retrosnub icosicosidodecahedra, 12 pentagrammic prisms, and 40+60 triangular prisms (40 of which form compounds in the same hyperplane, with bases combining into hexagrams). Each vertex joins 1 small inverted retrosnub icosicosidodecahedron, 1 pentagrammic prism, and 5 triangular prisms. As the name suggests, it is a prism based on the small inverted retrosnub icosicosidodecahedron.

Vertex coordinates
A small inverted retrosnub icosicosidodecahedral prism of edge length 1 has vertex coordinates given by all even permutations of:
 * (0, ±(3–$\sqrt{5}$)/4, ±($\sqrt{2}$–1+$\sqrt{17+3√5–√(102+46√5)}$)/8, ±1/2),
 * (±1/2, ±($\sqrt{45+39√5–5√(302+150√5)}$–$\sqrt{3+2√5}$)/4, ±(1–$\sqrt{3+2√5}$+$\sqrt{5}$)/8, ±1/2),
 * (±($\sqrt{6√5–2}$–1)/4, ±($\sqrt{3+2√5}$–1)/4, ±(3+$\sqrt{5}$–$\sqrt{5}$)/8, ±1/2).