Citrine is a yellow to orange-yellow form of quartz. Both amethyst and citrine owe their color to small quantities of iron impurities in the quartz, but a higher temperature is needed to form the yellow of citrine than that needed to form the purple of amethyst.
Geologically formed citrine is far less common than amethyst, and much citrine is produced by the careful heating of amethyst. Even then, to meet demand and keep production costs low, most of the citrine in the bargain-priced market is of synthetic manufacture. There are also good-colored glass fakes.
Brazil, Madagascar, and the United States are large suppliers of citrine, but quantities are found around the world.
Image courtesy of irocks.com.
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