To solve this problem, we need to identify the chemical formula of malachite.$\newline$Malachite is a mineral and a common ore of copper. It is a basic copper carbonate.$\newline$The chemical formula for malachite is $CuCO_3 \cdot Cu(OH)_2. \newline$Let's analyze the given options:$\newline$• Option 1: $CuFeS_2$ is chalcopyrite, a copper iron sulfide mineral.$\newline$• Option 2: $Cu(OH)_2$ is copper(II) hydroxide, not malachite.$\newline$• Option 3: $Fe_3O_4$ is magnetite, an iron oxide mineral.$\newline$• Option 4: $CuCO_3 \cdot Cu(OH)_2$ is malachite, a basic copper carbonate.$\newline$Therefore, the correct option is Option 4.