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Enlace: http://www.amnh.org/exhibitions/amber/index.html

Descripción: American Museum of Natural History.
«Amber is a form of tree resin -- exuded as a protective mechanism against disease and insect infestation -- that has hardened and been preserved in the earth's crust for millions of years. Often regarded as a gem, amber is actually an organic substance whose structure has changed very little over time, unlike that of other fossilized material, in which organic matter is replaced with minerals.»