Amethyst crystals, a variety of quartz, (silicon dioxide). The purple colour in amethysts is caused by the presence of compounds of iron or manganese.

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Amethyst crystals, 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.

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Keywords: amethyst, amethysts, crystal, crystals, dioxide, earth, gem, gems, gemstone, gemstones, geological, geology, precious, purple, quartz, science, silica, silicon, stone