Copper carbonate, also known as Basic Copper Carbonate (WSDTY), is a malachite green color, so it is also called malachite. It is a precious mineral gem. It is a substance produced by the reaction of copper with oxygen, carbon dioxide and water in the air. It is also called copper rust and is green in color. Heating in air decomposes into copper oxide, water and carbon dioxide. Soluble in acid and form the corresponding copper salt. It is also soluble in cyanide, ammonium salts and aqueous alkali metal carbonate solutions to form copper complexes. When boiled in water or heated in a strong alkali solution, brown copper oxide is formed and decomposed into black copper oxide at 200 °C. It is unstable in hydrogen sulfide atmosphere and can react with hydrogen sulfide to form copper sulfide. There are more than ten forms of compounds in the basic copper carbonate according to the ratio of CuCO3:H2O. It exists in the form of malachite in nature.

When placed in the air for a long time, it absorbs moisture and emits carbon dioxide, which gradually turns into a green malachite. It exists in the form of azurite in nature.

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