• Pegmatite - Wikipedia

    en.wikipedia.org/wiki/Pegmatite A pegmatite is an igneous rock, formed underground, with interlocking crystals usually larger than 2.5 cm in size (1 in).Most pegmatites are found in sheets of rock (dikes and veins) near large masses of igneous rocks called batholiths.The word pegmatite derives from Homeric Greek, πήγνυμι (pegnymi), which means “to bind together”, in reference to the intertwined crystals of quartz ...
  • Pegmatite: Igneous Rock - Pictures, Definition & More

    geology.com/rocks/pegmatite.shtml Pegmatite: Pegmatite is an igneous rock composed almost entirely of crystals that are over one centimeter in diameter. The specimen shown here is about two inches (five centimeters) across. Topaz on albite: A crystal of imperial topaz on an albite matrix from a pocket in the Katlang Pegmatite of Pakistan. Specimen is about 4.5 x 3.5 x 3.5 centimeters.
  • Pegmatite | rock | Britannica

    www.britannica.com/science/pegmatite Pegmatite, almost any wholly crystalline igneous rock that is at least in part very coarse grained, the major constituents of which include minerals typically found in ordinary igneous rocks and in which extreme textural variations, especially in grain size, are characteristic. Giant crystals,
  • Pegmatite - Igneous Rocks

    www.sandatlas.org/pegmatite Pegmatite is an exceptionally coarse-grained plutonic igneous rock.Most pegmatites have a mineralogical composition of granite but composition has no defining importance here. Pegmatites may have any imaginative magmatic composition and they are actually known to contain a large number of unusual minerals.
  • Pegmatite: An Intrusive Igneous Rock - ThoughtCo

    www.thoughtco.com/pegmatite-rock-4169633 Pegmatite is an intrusive igneous rock made up of large interlocking crystals.The word "pegmatite" comes from the Greek word pegnymi, which means "to bind together," referring to the entwined feldspar and quartz crystals commonly found in the rock. Rocks that display large, granular crystal structure are called "pegmatitic."
  • Pegmatite - an overview | ScienceDirect Topics

    www.sciencedirect.com/topics/earth-and-planetary-sciences/pegmatite Pegmatite veins have a lenticular form; sometimes these are schlieren-type pegmatoid isolations invariably of small sizes (length of a few dozen meters, thickness of a few meters). They are weakly zoned, as expressed in the replacement from the contact of bodies toward their center of two to three varieties by indistinctly exposed, but distinct ...
  • Pegmatite | Geology Wiki | Fandom

    geology.fandom.com/wiki/Pegmatite Template:Refimprove A pegmatite is a very crystalline, intrusive igneous rock composed of interlocking crystals usually larger than 2.5 cm in size; such rocks are referred to as pegmatitic. Most pegmatites are composed of quartz, feldspar and mica; in essence a granite. Rarer intermediate composition and mafic pegmatites containing amphibole, Ca-plagioclase feldspar, pyroxene and other ...
  • Pegmatite - Black Canyon Of The Gunnison National Park (U ...

    www.nps.gov/blca/learn/nature/pegmatite.htm Pegmatite is abundant throughout the 48 mile canyon, and is found in the form of stripes on the cliffs as well as large bodies. The largest of these are found upstream from East Portal, but some outcrops are surprisingly close to the edge, such as the Kneeling Camel on the north rim of the canyon.
  • Pegmatite | Properties, Composition, Formation, Uses ...

    geologyscience.com/rocks/pegmatite Pegmatite crystal texture form within pegmatitic rock may be taken to extreme size and perfection. Feldspar within a pegmatite may display exaggerated and perfect twinning, exsolution lamellae, and when affected by hydrous crystallization, macroscale graphic texture is known, with feldspar and quartz intergrown.
  • Pegmatites – Our Greatest Source of Gemstones | Geology ...

    www.geologyforinvestors.com/pegmatites-our-greatest-source-of-gemstones Pegmatites are the major source of gem-quality minerals throughout the world. They typically host perfectly clear topazes, tourmalines, beryls and are mined globally: from Brazil (the Minas Gerais region), to Ukraine (Volyn pegmatite field, near Volodarsk-Volynsk), Russia (Alabanshka pegmatite district in the Urals), US (The Sawtooth Batholith, Colorado; San Diego County, California), Nigeria ...