Smokey quartz

Smokey quartz

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Credit: CHARLES D. WINTERS/SCIENCE PHOTO LIBRARY

Caption: Smoky quartz crystals. Quartz (silicon dioxide) is colourless when pure, but impurities can impart a range of colours. It is thought the smoky colour arises from exposure to natural radioactivity.

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Keywords: crystal, crystalline, crystals, earth, geology, mineral, quartz, science, semi-precious, silicon dioxide, smoky

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