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Iron carbonate is formed from iron, carbon, and oxygen, where carbon and oxygen are in a carbonate ion (-2) form.
Iron II carbonate (known as siderite) has the formula FeCO3, where iron has a valence of 2 and the carbonate ion has a valence of -2.
Iron III carbonate (ferric carbonate) has the formula Fe2(CO3)2 where iron has a valence of 3.
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Iron and carbon.
