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Amethyst - Mineral Quartz
Amethyst at Museum of Mineralogy Constantin Gruescu, Ocna de Fier - Romania. 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.The hardness of the mineral is the same as quartz, thus it is suitable for use in jewelry.
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