Ferrous Sulphate Heptahydrate - 19% Ferrous Sulphate Mohohydrate - 30% Ferrous sulfate is an iron salt with the chemical formula FeSO4. Ferrous sulfate is an iron salt popularly known as green vitriol. Imferon and iron dextran are injectable iron. Ferrous fumarate, ferrous gluconate, and ferrous sulfate are generic names for oral iron. Chemical Formula: FeSO4 Density: 2.84 g/cm Melting Point: 56-64 C Boiling Point: >300 C