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silver

Silver has long been valued as a precious metal More abundant than gold, silver metal has in many premodern monetary systems functioned as coinable specie sometimes even alongside . . .
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iron

Iron is a relatively abundant element in the universe. It is found in the sun and many types of stars in considerable quantity. Iron nuclei are very stable. Iron is a vital constituent of plant and animal life, and is the . . .
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rare metals

A rare earth element (REE) or rare earth metal (REM), as defined by is one of a set of seventeen chemical elements in the periodic table, specifically the fifteen lanthanides, as well as scandium and yttrium. . .
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coltan

Coltan (short for columbite/tantalite and known industrially as tantalite) is a dull black metallic ore from which the elements niobium and tantalum are extracted. The niobium-dominant mineral in coltan is columbite . . .
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