The mineral Pyrite is a common mineral that is found all over the world. It often forms well-formed crystals in the shape of a cube with a beautiful golden shine. It is called cat gold or mad gold (from the English fool’s gold) because it was sometimes thought of as gold. Because it occurs to a large extent, this can create the illusion of great wealth and in the past it was sometimes sold as real gold. In our web store we sell both small and large cubic pyrite pieces.