Ferrous sulfate, with the chemical formula FeSO₄, is commonly found in its heptahydrate form (FeSO₄·7H₂O). It is a light green crystalline or granular solid, readily soluble in water.
It is an important inorganic chemical raw material with reducing, iron-supplementing, and flocculating properties, and is widely used in chemical, wastewater treatment, pharmaceutical, agricultural, and feed additive industries.