Amethyst is the widely known and very popular purple form of macrocrystalline Quartz, and is in fact one of the most valuable forms of the common mineral. Amethyst is famous for its purple color, which is caused by iron impurities within the structure of the Quartz crystal. Beyond the traditional big four ‘precious stones’, which are Diamond, Ruby, Sapphire, and Emerald, Amethyst is probably the most recognizable and well known type of gemstone to the general public. Amethyst is also the birthstone for February.
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