Copper(II) carbonate is a chemical compound with the formula CuCO₃. It consists of copper in the +2 oxidation state, combined with carbonate ions. This compound is often found in nature as the mineral malachite, which is known for its vibrant green color. In its pure form, copper(II) carbonate appears as a blue-green powder. It is used in various applications, including as a pigment in ceramics and glass, and in the production of other copper compounds. When heated, it decomposes to form copper(II) oxide and carbon dioxide.