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^BAmethyst crystals^b, a variety of quartz, (silicon dioxide). The purple colour in amethysts is caused by the presence of compounds of iron or manganese. It is often used as a gemstone in jewellery, especially in rings. Although amethyst is found in Europe and North America, the finest specimens occur in India, Sri Lanka and Brazil.
px | px | dpi | = | cm | x | cm | = | MB |
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