Cobalt(II) nitrate hexahydrate, min. 98 %, extra pure, Molar mass (M) 291,04 g/mol, Density (D) 1,87 g/cm³, CAS No. [10026-22-9], UN-Nr. 1477, EG-Nr. 233-402-1, Empirical formula Co(NO3)2 · 6 H2O