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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.
About Amethyst-History and Introduction. Amethyst is one of the most precious and valuable stones belonging to the quartz group of minerals, with exception to rare blue-green gem silica.ine amethyst is transparent, which means that the light passes through the stone unhindered. In translucent amethyst, the passage of light is slightly weakened as it travels through the stone. The best quality amethyst is clean and free of visible inclusions of any kind.