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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 is a commonly seen semiprecious gemstone that has a unique violet color. It belongs to the quartz family and is traditionally the birthstone of people born in the month of February. Due to its legendary powers and striking beauty, Amethyst has always been considered to be a valued gemstone since the time of the Romans and Greeks.