What is the formula of Green vitriol?

FeSO₄.7H₂O

The chemical name of green vitriol is ferrous sulfate or iron(II) sulfate. It is also known as COPPERAS. It is most commonly encountered as the blue-green heptahydrate. The molecular formula of green vitriol is FeSO₄.7H₂O. This is the most common form of blue-green heptahydrate.
Green vitriol is extensively used in the textile industries as well as metallurgical industries along with some other purposes. Green vitriol is an odorless compound. It can exist in powder as well as in crystal form. It can easily dissolve in water; its solubility is very high. This compound is paramagnetic.