Iron sulfide is a chemical compound composed of iron and sulfur atoms. It is commonly found in nature as different mineral forms, such as pyrite (FeS2), marcasite (FeS2), and greigite (Fe3S4). Iron sulfide has various industrial applications, such as in the production of sulfuric acid and in the manufacturing of batteries. Research in the field of iron sulfide focuses on its geochemical and environmental significance, as well as its potential use in various technologies. This includes studying its role in microbial metabolism, its impact on the cycling of sulfur and iron in the environment, and its potential as a material for energy storage and conversion applications. Iron sulfide research is also important for understanding its role in geological processes, such as ore formation and the formation of mineral deposits.