"ESMERALDAS / A rare type of emerald known as a trapiche emerald is occasionally found in the mines of Colombia. A trapiche emerald exhibits a ""star"" pattern; it has raylike spokes of dark carbon impurities that give the emerald a six-pointed radial pattern.[citation needed] Emeralds come from three main emerald mining areas in Colombia: Muzo, Coscuez, and Chivor.
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