Iron(II) chloride is a paramagnetic solid with a high melting point. The compound is white, but typical samples are often off-white. FeCl2 crystallizes from water as the greenish tetrahydrate, which is the form that is most commonly encountered in commerce and the laboratory. There is also a dihydrate. The compound is also soluble in water; aqueous solutions of FeCl2 are highly transparent and pale green in color.Iron dichloride tetrahydrate is a hydrate that is the tetrahydrate form of iron dichloride. It is a hydrate, an iron coordination entity and an inorganic chloride. It contains an iron dichloride.