Nickel (II) chloride hexahydrate is the chemical compound NiCl₂·6H₂O .it is green crystalline salt. Nickel(II) chloride hexahydrate is a hydrated nickel salt. Its crystals were monoclinic and structure was investigated by X-ray single crystal method. NiCl₂·6H₂O can be used to form a variety of nickel coordination complexes.