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Glossary

pegmatite
definition:pegmatite

A very coarse-grained intrusive igneous rock composed of interlocking grains usually larger than 2.5 cm size. Most pegmatites are composed of quartz, feldspar and mica. Pegmatites often contain rare earth minerals and gemstones, such as aquamarine, tourmaline, topaz, fluorite, apatite and corundum. They are also the primary source of lithium either as spodumene, lithiophyllite or usually from lepidolite (Li-mica).

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