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Title: Law of definite proportions
Caption: Basic copper carbonate occurs in nature as the mineral malachite (a). It is formed as a patina on copper roofs (b). It can also be synthesized in the laboratory (c). Regardless of its source, basic copper carbonate always has the same composition. Analysis of this compound led Proust to formulate the law of definite proportions.
Keywords: copper carbonate, malachite, patina, Proust, law of definite proportions