Prasiolite is a green variety of quartz. Prasiolite is a rare stone in nature; artificial prasiolite is produced by heat treatment of amethyst. Most amethyst will turn yellow or orange when heated, producing heat-treated amethysts which are often marketed as citrine, but some amethyst will turn green when treated. Currently, almost all prasiolite on the market results from a combination of heat treatment and ionizing radiation.
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