pegmatite definition

  • noun:
    • A coarse-grained granite, occasionally abundant with unusual elements eg uranium, tungsten, and tantalum.
    • A coarsely crystalline igneous or plutonic rock composed mainly of feldspar and quartz, normally with muscovite and/or biotite mica. Usually contains various other minerals, that might be of financial importance. Pegmatite is chemically identical to granite, but has actually a much coarser crystal construction. Typical colors tend to be gray, white, and green. Pegmatite is quarried for attractive stone and as a source of beryllium, columbium and tantalum whenever they are present. Gemstones of quartz/silicate family may also be present pegmatites.
    • Graphic granite. See under granite.
    • More typically, a coarse granite happening as vein material in other rocks.
    • Coarsely crystallized granite. Also referred to as granitel, granitelle.
    • a type of igneous rock consisting of incredibly coarse granite caused by the crystallization of magma abundant with rare elements

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