Gold flakes from Spain held in a hand

Gold Au, chemical element, a dense lustrous yellow precious metal of Group 11 Ib, Period 6, of the periodic table. Gold has several qualities that have made it exceptionally valuable throughout history. It is attractive in colour and brightness, durable to the point of virtual indestructibility, highly malleable, and usually found in nature in a comparatively pure form. The history of gold is unequaled by that of any other metal because of its perceived value from earliest times. Celestine is isomorphous with Barite, and may partially replace it. One specimen may even be part Barite and part Celestite within a single crystal. Celestine is named from the Latin term caelestis, alluding to it typical celestial sky-blue color.

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