👉 The term "ferroprussiate" is a chemical compound composed of iron and prusside, which are two elements. The chemical formula for ferroprussiate is FePr2O5. This compound can be found in various ores such as hematite (Fe3O4) and magnetite (FeS·xSiO2), where it forms a black oxide layer on the surface of these minerals, which gives them their distinctive red color.
