Pegmatite

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• Pegmatite — is a very coarse grained igneous rock that has a grain size of 20 mm or more; such rocks are referred to as pegmatitic .Most pegmatites are composed of quartz, feldspar and mica; in essence a granite . Rarer intermediate and mafic pegmatite… …   Wikipedia

• pegmatite — [ pɛgmatit ] n. f. • 1807; du gr. pêgma, pêgmatos « conglomération » ♦ Minér. Roche magmatique dont les cristaux granitoïdes de grande taille peuvent contenir des éléments rares (lithium, uranium). « la terre de bruyère, maigre et sèche, [...]… …   Encyclopédie Universelle

• Pegmatite — Peg ma*tite, n. [From Gr. ? something fastened together, in allusion to the quartz and feldspar in graphic granite: cf. F. pegmatite. See {Pegm}.] (Min.) (a) Graphic granite. See under {Granite}. (b) More generally, a coarse granite occurring as… …   The Collaborative International Dictionary of English

• pegmatite — s. f. [Geologia] Rocha ordinariamente granulosa que tem por base o feldspato e o quartzo …   Dicionário da Língua Portuguesa

• pegmatite — [peg′mə tīt΄] n. [< Gr pēgma (gen. pēgmatos), a framework, something fastened together (< IE base * paĝ : see FANG) + ITE1: from its texture] a light colored, coarsegrained, intrusive igneous rock, usually granitic, containing large… …   English World dictionary

• pegmatite — pegmatitic /peg meuh tit ik/, adj. /peg meuh tuyt /, n. Petrol. a coarsely crystalline granite or other high silica rock occurring in veins or dikes. [1825 35; < Gk pegmat (s. of pêgma) anything fastened together, a bond (Compare pegnýein to… …   Universalium

• Pegmatite — Pegmatịte   [zu griechisch pẽgma, pe̅gmatos »Festgewordenes«], Singular Pegmatịt der, s, aus einer an leichtflüchtigen Bestandteilen reichen, meist granitische Restschmelze des Magmas (Differenziation) entstandene grob bis riesenkörnige… …   Universal-Lexikon

• pegmatite — noun 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… …   Wiktionary

• pegmatite — pegmatitas statusas T sritis chemija apibrėžtis Rūgšti magminė gyslinė stambiagrūdė uoliena. atitikmenys: angl. pegmatite rus. пегматит …   Chemijos terminų aiškinamasis žodynas

• pegmatite — noun Etymology: French, from Greek pēgmat , pēgma something fastened together, from pēgnynai to fasten together more at pact Date: circa 1828 a coarse variety of granite occurring in dikes or veins • pegmatitic adjective …   New Collegiate Dictionary