Gray and turquoise single monoclinic system crystalline powder or granule. Inodorous, taste salty. Easily airslake in dry air, 1,Chemical Name: FERROUS SULFATE2,Molecular Formula : FeSO4·7H2O3,Molecular Weight: 74.54,CAS: 7720-78-75,Character: Gray and turquoise single monoclinic system crystalline powder or granule. Inodorous, taste salty. Easily airslake in dry air, it is easy to oxidize to ...