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emerald


Emerald crystal from Muzo, Colombia
Emerald crystal from Muzo, Colombia. Image source: Wikipedia
A valuable green gemstone, a variety of beryl. Emerald's green color is caused by chromium, and occasionally by vanadium, impurities. Some of the best emeralds are mined in Colombia, Brazil, and Zambia.


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   • GEOLOGY AND PLANETARY SCIENCE


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