FeS2, commonly known as pyrite or "fool's gold," is a mineral composed of iron and sulfur. It has a metallic luster and a pale brass-yellow hue, often resembling gold, which is why it is sometimes mistaken for the precious metal. Pyrite is found in various geological formations and is often associated with other minerals. In addition to its aesthetic appeal, FeS2 has practical applications. It is used in the production of sulfuric acid, a key chemical in various industries. Pyrite also plays a role in the study of geology and mineralogy, helping scientists understand the conditions under which certain rocks form.