DR JUERG ALEAN / SCIENCE PHOTO LIBRARY DR JUERG ALEAN / SCIENCE PHOTO LIBRARY
Quartz needle crystals. Slender quartz crystals (so-called 'needle quartz') with orange crystals of anatase, a titanium oxide mineral. This specimen, about 1 centimetre across, is from the Bedretto valley, Ticino, in the Swiss Alps.
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