Among the following statements, the incorrect one is:

The formula of calamine is 3 ZnCO , the formula of siderite is 3 FeCO , the formula of cuprite is 2 Cu O , the formula of argentite is 2 Ag S , the formula of zinc blend is ZnS, the formula of pyrites is 2 FeS , the formula of malachite is 3 2 CuCO .Cu(OH) , and the formula of azurite is 3 3 2 2 Cu (CO ) (OH) . So, the option (b) is incorrect.