Cut and Polished Amethyst

Cut and Polished Amethyst

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Credit: Mark A. Schneider/SCIENCE PHOTO LIBRARY

Caption: Amethyst is a violet variety of quartz often used in jewellery. Amethyst is the purple variety of quartz (SiO2), containing an impurity of iron, which gives the violet colour to the mineral. The hardness of the mineral is the same as that of quartz, thus it is suitable for use in jewellery. This particular Amethyst specimen came from South Africa. Specimen Dimension: approximately 3 cm.

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Keywords: amethyst, cut gemstone, gem, gemstone, geology, mineral, mineralogy, polished gemstone, purple mineral, quartz, rock, semiprecious stone, si02, silicon compound, silicon dioxide, south african, violet colour

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