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Credit: Turtle Rock Scientific/SCIENCE PHOTO LIBRARY

Caption: Amethyst specimen from China. Amethyst is a semiprecious stone. It is a violet or purple form of quartz (silica or silicon dioxide, SiO2).

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Keywords: amethyst, chemical, chemistry, crystal, gem, gemstone, quartz, science, semiprecious, silica, silicon dioxide, sio2, specimen, stone

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