Lapis Lazuli Icosahedra

Lapis Lazuli Icosahedra

 
A beautiful collection of Lapis icosahedron.
 
These are polyhedron that has 20 faces (from Greek icosa- meaning 20)

Each face is an Equal, it has 30 Edges,12 Vertices (corner points) and at each vertex 5 edges meet.
When we have more than one icosahedron they are called icosahedra.