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Amethyst is a purple variety of quartz (SiO2) and owes its violet color to irradiation, iron impurities (in some cases in conjunction with transition element impurities), and the presence of trace elements, which result in complex crystal lattice substitutions.
Amethyst, the violet to purple quartz, is one of the most popular gemstones among gem appreciators. Many years ago, amethyst was classified as a precious stone, like ruby, sapphire and emerald.