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Contact SupplierFerrous sulfate crystals are the solid form of iron(II) sulfate, a chemical compound with the formula FeSO4\text{FeSO}_4FeSO4. These crystals typically appear as blue-green to pale green, depending on the amount of water associated with the compound. When they are hydrated, they often have the formula FeSO4⋅7H2O\text{FeSO}_4 \cdot 7\text{H}_2\text{O}FeSO4⋅7H2O, commonly known as copperas or green vitriol.