Amethyst and chalcedony

Amethyst and chalcedony

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Credit: DIRK WIERSMA/SCIENCE PHOTO LIBRARY

Caption: Amethyst and chalcedony. Cut and polished sample of crystals of amethyst (purple) around a core of chalcedony. Amethyst is variety of quartz (silicon dioxide, SiO2) and chalcedony is an amorphous variety of the same mineral. Amethysts are used as precious stones and ornaments. The diameter of this sample is 5 centimetres.

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Keywords: amethyst, chalcedony, close-up, cross-section, crystal, crystalline, crystals, cut, detail, earth science, gemstone, geological, geology, mineral, mineralogy, nature, polished, quartz, silicon dioxide

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