A silvery-white, soft, nonmagnetic, ductile metal. By mass, aluminum makes up about 8% of the Earth’s crust; it is the third most abundant element after oxygen and silicon. Known to the ancients, aluminum cost more than gold in the 19th century, and it was not commercially viable until the electrolytic aluminum process was independently discovered in 1886, by Paul Héroult (France) and Charles Martin Hall (US). Because of this, the process was called the Hall-Heroult process. That facilitated large-scale production of metallic aluminum. (See: 6061 T6 Aluminum, Anodized Aluminum, and Duralumin)
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