Elongate prismatic crystals of clear green tourmaline embedded in quartz. Tourmaline is a boron-silicate mineral of variable colour, some of which are much sought after as semi-precious gemstones. It usually occurs in igneous rocks. Common varieties are elbaite, schorl (opaque and pitch black) and dravite, honey-brown and semi translucent. Actual height of specimen is 85 mm.

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Photo credit: © DIRK WIERSMA/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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Keywords: -, boron, crystal, crystalline, crystals, dioxide, dravite, earth, elbaite, elongate, gemstone, geological, geology, green, mineral, mineralogy, prismatic, quartz, rock, schorl, sciences, semi-precious, semiprecious, silica, silicon, tourmaline, turmaline