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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 gemstone, a variety of violet Quartz with the chemical formula is SiO2. Because it has a hardness of seven on the Mohs Scale, amethyst is suitable for use in jew â¦ elry. Due to its crystal quantity and relative rarity, larger samples can broach several hundred dollars.