👉 Pyrostilpnite is a type of mineral that occurs in the soil and has been used for centuries as a natural fertilizer. It is composed of the compound stilbene, which is a member of the alkaloid family. The chemical structure of stilbene is similar to that of pyrostenol, a synthetic compound commonly found in fertilizers. Pyrostilpnite can be extracted from soil using various techniques such as hot water extraction or by using an acid solution.