Bidecachoron

The tetradisphenoidal triacontachoron, also known as the bidecachoron, is a convex noble polychoron with 30 tetragonal disphenoids as cells. It is also the 10-3 step prism.

It is also the convex hull of a pentachoron and its central inversion.

Vertex coordinates
Coordinates for the vertices of a tetradisphenoidal triacontachoron, based on two pentachora of edge length 1, centered at the origin, are given by:
 * (0, 0, 0, ±$\sqrt{10}$/5)
 * (0, 0, -$\sqrt{6}$/4, $\sqrt{10}$/20)
 * (0, 0, $\sqrt{6}$/4, -$\sqrt{10}$/20)
 * (0, -$\sqrt{3}$/3, $\sqrt{6}$/12, $\sqrt{10}$/20)
 * (0, $\sqrt{3}$/3, -$\sqrt{6}$/12, -$\sqrt{10}$/20)
 * (±1/2, $\sqrt{3}$/6, $\sqrt{6}$/12, $\sqrt{10}$/20)
 * (±1/2, –$\sqrt{3}$/6, -$\sqrt{6}$/12, -$\sqrt{10}$/20)