Tourmaline is a boron-silicate mineral often occurring as straight and elongate prismatic crystals. It occurs in a number of varieties (schorl, dravit

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Tourmaline is a boron-silicate mineral often occurring as straight and elongate prismatic crystals. It occurs in a number of varieties (schorl, dravite) in igneous rocks. Best known and much sought after for jewelerare the clear crystalline varieties that occur in different colors which are sometimes combined in one specimen like seen in this exceptional specimen, from Minas Gerais, Brazil, with an actual length of 240 mm

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Photo credit: © DIRK WIERSMA/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: boron, brazil, color, crystal, crystalline, dravite, elongate, gemstone, gerais, jeweler, minas, mineral, mineralogy, multicolored, prismatic, schorl, silicate, tourmaline, turmaline