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Rhenium single crystal bar and 1cm3 cube. A single crystal of rhenium made by the floating zone process (left), an ebeam remelted rhenium bar (center), as well as a 1 cm3 cube. Rhenium is a silvery-white, heavy transition metal that is one of the rarest elements in the Earth's crust. It was the last stable element to be discovered and is named after the river Rhine in Europe.
Rhenium is a silvery-white, heavy, metal in group 7 of the periodic table. It is one of the rarest elements in the Earth's crust. It has the third-highest melting point and highest boiling point of any element. Rhenium resembles manganese chemically and is obtained as a by-product of molybdenum and copper refinement. Nickel-based superalloys for use in jet engines contain up to 6% rhenium, being the largest use for the element, with chemical industry catalytic uses being next-most important.