 Galena PbS (primary) alters to secondary anglesite PbSO4 and cerussite PbCO3.Sphalerite ZnS (primary) alters to secondary hemimorphite Zn4Si2O7(OH)2.H2O, smithsonite ZnCO3 and manganese-bearing willemite Zn2SiO4.Pyrite FeS2 (primary) alters to secondary melanterite FeSO4.7H2O.