In this question, we need to identify which compound among the given options is known as malachite.
Malachite is a copper carbonate hydroxide mineral with the chemical formula . This is a common copper mineral and is known for its bright green color, which is often used as a gemstone and in ornamental carvings.
- : This is Chalcopyrite, a copper iron sulfide mineral.
- : This is Copper(II) hydroxide, a blue solid substance used as a pigment.
- : This is Magnetite, an iron oxide mineral, and it is not related to copper.
- : This is Malachite, a green mineral consisting of copper carbonate hydroxide.
Therefore, the correct answer is , which is the formula for malachite.
To conclude, malachite is characterized by its distinctive green color and is represented by the chemical formula . This distinguishes it from other minerals and compounds listed in the options.