FeSO4, or iron(II) sulfate, is a chemical compound made up of iron, sulfur, and oxygen. It typically appears as a blue-green crystalline solid and is soluble in water. This compound is often used in various applications, including agriculture as a soil amendment and in water treatment processes to remove impurities. In addition to its industrial uses, FeSO4 plays a role in the production of iron and steel. It is also utilized in the manufacture of pigments and as a dietary supplement to treat iron deficiency anemia. Its chemical formula indicates that it contains one iron atom, one sulfur atom, and four oxygen atoms.