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Pegmatitic Textures

A pegmatitic texture is one in which the mineral grains are exceptionally large. The largest ones are, by convention, more than about 3 cm long. This texture is found in intrusive rocks. The extra large size does not mean that they cooled extra slowly. Instead, the large crystals of a pegmatite formed in a magma that was extra...

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Pegmatite: Igneous Rock - Pictures, Definition & More - Geology.com

What is Pegmatite? Pegmatites are extreme igneous rocks that form during the final stage of a magma's crystallization. They are extreme because they contain exceptionally large crystals and they sometimes contain minerals that are rarely found in other types of rocks. To be called a “pegmatite,” a rock should be composed...

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Pegmatite: Pegmatite mineral information and data. - Mindat.org

A term originally suggested by Haüy as a synonym for graphic granite , but later used for the coarse-grained facies of any type of igneous rock. An exceptionally coarse-grained igneous rock, with interlocking crystals, usually found as irregular dikes, lenses, or veins, esp. at the margins of batholiths. Most grains are 1 cm or...

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