Amethyst crystals

Amethyst crystals

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Credit: MARK WILLIAMSON/SCIENCE PHOTO LIBRARY

Caption: A sample of quartz (SiO2) amethyst crystals (violet variety). Photographed at Focus Terra, the Earth Science Research and Information Centre of ETH, the Swiss Federal Institute of Technology, Zurich.

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Keywords: amethyst, crystal, crystals, deposit, deposits, eth, geological, geology, mineral, minerals, ore, ores, purple, quartz, red, rock, sample, silicon, switzerland, violet, zurich

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