Black tourmaline in mica schist. Tourmaline is a crystal silicate mineral. It is a semi-precious gemstone and comes in a wide variety of colours. This

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Black tourmaline in mica schist. Tourmaline is a crystal silicate mineral. It is a semi-precious gemstone and comes in a wide variety of colours. This black variety is known as schorl. Mica schists are common metamorphic rocks that can be recognised by their schistosity (fine planar alignment of minerals) and the presence of micas (silicate minerals).

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

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