Copper(II) carbonate is a chemical compound with the formula CuCO₃. It consists of copper, carbon, and oxygen, and is typically found as a blue-green solid. This compound is often used in various applications, including as a pigment in ceramics and as a precursor in the production of other copper compounds. When heated, copper(II) carbonate decomposes to form copper(II) oxide and carbon dioxide. It is also known for its role in the natural weathering of copper ores, contributing to the formation of patina on copper surfaces.