Iron pyrite, commonly known as fool's gold, is a mineral composed of iron and sulfur, with the chemical formula FeS₂. It has a metallic luster and a pale brass-yellow color, which often leads to its mistaken identity as gold. Iron pyrite is found in sedimentary, metamorphic, and igneous rocks and is often associated with other minerals like chalcopyrite and galena. This mineral is not only significant in geology but also has industrial applications. It is used in the production of sulfuric acid and can be a source of sulfur for various chemical processes. Additionally, iron pyrite can be found in coal deposits, where it may contribute to environmental concerns due to acid mine drainage.