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Aquamarines and emeralds are essentially the same gemstone, but aquamarine stones derive their distinctive blue coloration from the presence of scandium. As a pure metal, scandium is silvery-white, but it becomes pink or yellow upon exposure to air. Scandium is the first transition metal, yet many people have never even heard of it.
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March 27, 2009 at 3:47 pm
(1) eduardo says:

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March 9, 2012 at 11:57 am
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