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Trapiche-like Amethyst from Brazil

"Minerals such as corundum, beryl, tourmaline, and quartz, which belong to either the trigonal or the hexagonal crystal system, can show a trapiche-like texture with a hexagonal core and six extended arms when viewed down the c-axis. Four trapiche-like amethyst cabochons (figure 1) were submitted to GIA's Carlsbad laboratory by L. Allen Brown (All That Glitters, Methuen, Massachusetts) for scientific examination....."

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Trapiche-like Amethyst from Brazil