Great snub icosahedron

The great snub icosahedron, gissi, or second compound of ten octahedra is a uniform polyhedron compound. It consists of 20+60 triangles, with 4 triangles joining at each vertex.

Each octahedral component has triangular antiprismatic symmetry. If each component is rotated by 60°, the snub icosahedron, the other uniform compound of ten octahedra, is produced.

Its quotient prismatic equivalent is the great triangular antiprismatic decayottoorthowedge, which is twelve-dimensional.

Vertex coordinates
The vertices of a great snub icosahedron of edge length 1 are given by all even permutations of:
 * $$\left(0,\,±\frac{-2-\sqrt2-2\sqrt5+\sqrt{10}}{12},\,±\frac{-2+\sqrt2+2\sqrt5+\sqrt{10}}{12}\right),$$
 * $$\left(±\frac{6+4\sqrt2+2\sqrt5}{24},\,±\frac{\sqrt2-\sqrt5}{6},\,±\frac{-3+2\sqrt2+\sqrt5}{12}\right),$$
 * $$\left(±\frac{1-\sqrt2+\sqrt5+\sqrt{10}}{6},\,±\frac{-1+\sqrt2+\sqrt5+\sqrt{10}}{12},\,±\frac12\right).$$