These natural fossils were made by sea creatures eons ago and are now being offered to you as cabinet knobs. The stone is similar to marble with a harndess of 5. Morroccan Orthoceras polished fossils. A unique piece of prehistory that adds the dimension of timelessness to one's home or office. The Orthoceras is a relative of the squid or octopus with a long tubular body with many chambers.