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| Amethyst |
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.[1][2][3] The hardness of the mineral is the same as quartz, thus it is suitable for use in jewelry.
Wikipedia
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| Amethyst |
I read that this semiprecious gem is supposed to protect its owner from intoxication. It is the birth stone for February.
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