PASCAL GOETGHELUCK / SCIENCE PHOTO LIBRARY PASCAL GOETGHELUCK / SCIENCE PHOTO LIBRARY
Tourmaline crystals in quartz. The tourmaline crystals (green/purple) are embedded in quartz (silicon dioxide, white). Tourmaline has a very complex and variable composition. Clear and pure crystals of green and red tourmaline are highly prized gemstones. This sample, from Brazil, is 10 centimetres long.
Model release not available. Property release not required.