Joined pentachoron

The joined pentachoron is a convex isochoric polychoron with 10 triangular bipyramids as cells.

Isogonal derivatives
Substitution by vertices of these following elements will produce these convex isogonal polychora:
 * Triangular bipyramid (30): Rectified pentachoron
 * Isosceles triangle (30): Semi-uniform small rhombated pentachoron
 * Edge (10): Rectified pentachoron
 * Edge (20): Semi-uniform small prismatodecachoron
 * Vertex (5): Pentachoron
 * Vertex (5): Pentachoron