Pyritohedron

For many years, I collected all sorts of pieces of Iron Pyrites. They come in many forms, and this photo is of a tiny Pyritohedron crystal. Another name for Pyrites is Fool's Gold. I have a handful of photos of other pieces in my Shells and Minerals Set, if anyone is interested.

A pyritohedron has twelve pentagonal faces. It has 24 short edges, and 6 longer edges. It is one of the two common crystal forms of pyrite, the other one being cubical.