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Titanium and Tantalum are two of the most corrosion resistant construction materials available. Tantalum in particular is expensive, costing over $ 400 per kg and the annual production is usually below 1000 tons. Although 'Tantalite' was discovered in Sweden, today Australia is the primary mining area. Tantalum is usually found together with Niobium, in itself a valuable alloying element.

The ore is called Tantalite if it contains more Tantalum than Niobium; if it contains more Niobium than Tantalum, it's called Columbite. Before 1949 Niobium was called Columbium. Of course American metalurgists stuck to the name Columbium, in the way Americans always stick to archaic nomenclature and units.

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