pegmatite

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pegmatit
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A coarsely crystalline igneous or plutonic rock composed primarily of feldspar and quartz, normally with muscovite and/or biotite mica. Often contains other minerals, which may be of economic importance. Pegmatite is chemically identical to granite, but has a much coarser crystal structure. Common colors are gray, white, and pink. Pegmatite is quarried for decorative stone and as a source of beryllium, columbium and tantalum when these are present. Gemstones of the quartz/silicate family may also be found in pegmatites
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 (such as granites) and in which extreme textural variations, especially in grain size, are characteristic. Usually found as irregular dikes, lenses, or veins, pegmatite deposits occur in all parts of the world and are the chief source of commercial feldspar, sheet mica, and beryllium, tantalum-niobium, and lithium minerals
An extremely coarse-grained igneous rock with interlocking crystals, usually with a bulk chemical composition similar to granite but commonly containing rare minerals enriched in lithium, boron, fluorine, niobium, and other scarce metals Pegmatites are also the source for many gem-quality precious and semiprecious stones
More generally, a coarse granite occurring as vein material in other rocks
A very coarsely crystalline igenous rock, with crystals greater than 3 centimetres in length that formed during the final stages of cooling of a large volume of magma
{i} crystalline granite
yet another fancy geology word, this time referring to an igneous intrusion that has very large (several cm up to several meter) crystals Not all pegmatites are granitic, but many are Pegmatites tend to form late in the crystallization process of an igneous intrusion, and therefore are rich in strange elements that don't fit well into regular granite These strange elements promote the formation of minerals such as tourmaline, beryl, topaz, allanite, apatite, and many others
A coarse variety of granite occurring in dikes or veins
Natural igneous rock formation consisting of a variety of granite usually characterized by coarse texture caused by crystallization from an exceptionally fluid magma rich in mineralizers containing rare elements
A coarse grained, igneous rock which often contains commercial minerals, occasionally these are rare earth's
A coarse-grained igneous rock with exceptionally large crystals, formed from a magma that contains a high proportion of water
Graphic granite
a form of igneous rock consisting of extremely coarse granite resulting from the crystallization of magma rich in rare elements
See under Granite
pegmatite

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    peg·ma·tite

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    pegmıtayt

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    /ˈpegməˌtīt/ /ˈpɛɡməˌtaɪt/