Double-ended quartz crystal

Double-ended quartz crystal

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Credit: DR JUERG ALEAN/SCIENCE PHOTO LIBRARY

Caption: Double-ended quartz crystal. So-called 'phantom structures' in the left part of the crystal show successive stages of growth. As the crystal grew, clay minerals were deposited on the surface of the quartz crystal, but later became embedded as the growth continued. This specimen, about 3 centimetres across, is from the Lugnez valley, Grisons, Switzerland.

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Keywords: black background, clay minerals, close-up, crystal, crystalline, crystals, detail, double ended, double-ended, earth sciences, geological, geology, grisons, mineral, mineralogy, no-one, nobody, phantom, phantom structure, phantom structures, quartz, silica, silicon dioxide, specimen, swiss, switzerland

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