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Cadmium is a malleable blueish, silvery-white heavy metal. Commercially, it is produced as a by-product of treating other metals, including zinc, lead and copper ores. Today, cadmium is produced where zinc is refined, rather than where it is mined. It occurs naturally in the mineral Greenockite. Most cadmium compounds have been classified as a Category 1 carcinogen—carcinogenic in humans. [1,2,3]
