Nickel(II) chloride hexahydrate, min. 97 %, extra pure, Molar mass (M) 237,70 g/mol, Density (D) 1,92 g/cm³, CAS No. [7791-20-0], UN-Nr. 3288, EG-Nr. 231-743-0, Empirical formula NiCl2 · 6 H2O