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group of cardinal (or most valuable) gemstones (along with diamond , sapphire , ruby , and emerald ), amethyst has lost much of its value after the discovery of extensive deposits in locations such as brazil . characteristics as a variety of quartz , amethyst is composed mainly of silica (silicon dioxide
, sio ). its purple color was once attributed to the presence of manganese . that view, however, has been challenged because it does not explain why the stone changes its color from purple to yellow on exposure to heat. some, therefore, have attributed the color to the compound ferric thiocyanate, which...
https://www.newworldencyclopedia.org/entry/Amethyst
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