Pegmatites are dykes composed of large or coarse-grained minerals. They are usually made up of large crystals of K-feldspar, quartz and mica, such as in the common granite pegmatite. Some pegmatites may contain gem-quality minerals, such as aquamarine, tourmaline, topaz and rock crystal.
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(2020). Pegmatite. In: Chen, A., Ng, Y., Zhang, E., Tian, M. (eds) Dictionary of Geotourism. Springer, Singapore. https://doi.org/10.1007/978-981-13-2538-0_1853
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DOI: https://doi.org/10.1007/978-981-13-2538-0_1853
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