Blend of 2 pentagrammic pyramids

The , or gifbah, is an orbiform polyhedron. It consists of 6 triangles and 2 pentagrams. It is a faceting of the great icosahedron and thus also of the small stellated dodecahedron. As its name suggests, it can be formed by blending two pentagrammic pyramids together such that they share an edge and the two triangles adjacent to that edge.

It appears as a cell of the great stellated dodecahedral extended double antiprism.

Vertex coordinates
The vertices of a of edge length 1 are:


 * $$\left(\pm\frac{1-\sqrt{5}}{4},\,0,\,\pm\frac{1}{2}\right),$$
 * $$\left(\pm\frac{1}{2},\,-\frac{1-\sqrt{5}}{4},\,0\right),$$
 * $$\left(0,\,\frac{1}{2},\,\pm\frac{1-\sqrt{5}}{4}\right).$$