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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 Gemstone meaning. Crystalline quartz in shades of purple, lilac or mauve is called amethyst, a stone traditionally worn to guard against drunkeness and to instill a sober mind. The word amethyst comes from the Greek meaning without drunkenness and amethyst is believed to protect one from poison.