(A) Copper pyrites is $CuFeS_2$,which contains both iron and copper.Malachite is $CuCO_3 \cdot Cu(OH)_2$,which contains only copper.Azurite is $2CuCO_

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(A) Copper pyrites is $CuFeS_2$,which contains both iron and copper.Malachite is $CuCO_3 \cdot Cu(OH)_2$,which contains only copper.Azurite is $2CuCO_3 \cdot Cu(OH)_2$,which contains only copper.Dolomite is $CaCO_3 \cdot MgCO_3$,which contains calcium and magnesium.