DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Tourmaline crystals in quartz. The tourmaline crystals (green) are embedded in quartz (silicon dioxide, white or clear). Tourmaline has a very complex and variable composition. Clear and pure crystals of green and red tourmaline are highly prized gemstones. This sample is 8 centimetres across.
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