A group of fine-grained, generally porphyritic, extrusive igneous rocks having alkali feldspar and minor mafic minerals as the main components, and possibly a small amount of sodic plagioclase.

Glossary of volcanic terms. - University of Wisconsin Oshkosh. . 2001.

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  • Trachyte — is an igneous, volcanic rock with an aphanitic to porphyritic texture. The mineral assemblage consists of essential alkali feldspar; relatively minor plagioclase and quartz or a feldspathoid such as nepheline may also be present. (See the QAPF… …   Wikipedia

  • trachyte — [ trakit ] n. m. • 1801; du gr. trakhus « raboteux » ♦ Minér. Lave de type porphyroïde, rude au toucher. ⇒ obsidienne. Adj. TRACHYTIQUE . ● trachyte nom masculin (grec trakhutês, rudesse, dureté) Roche volcanique intermédiaire, riche en… …   Encyclopédie Universelle

  • Trachyte — Les trachytes sont des roches volcaniques riches en feldspaths alcalins et à teneur en silice assez élevée : ils appartiennent de ce fait au groupe des roches felsiques. Leur structure est principalement microlithique mais la présence de… …   Wikipédia en Français

  • Trachyte — Tra chyte, n. [Gr. ? rough, rugged: cg. F. trachyte.] (Geol.) An igneous rock, usually light gray in color and breaking with a rough surface. It consists chiefly of orthoclase feldspar with sometimes hornblende and mica. [1913 Webster] …   The Collaborative International Dictionary of English

  • trachyte — [trā′kīt΄, trak′īt΄] n. [Fr < Gr trachys, rough: see TRACHEA] a fine grained, light colored, extrusive igneous rock, consisting chiefly of alkali feldspars: it is the extrusive equivalent to syenite …   English World dictionary

  • trachyte — trachytic /treuh kit ik/, trachytoid /trak i toyd , tray ki /, adj. /tray kuyt, trak uyt/, n. a fine grained volcanic rock consisting essentially of alkali feldspar and one or more subordinate minerals, as hornblende or mica: the extrusive… …   Universalium

  • trachyte — trachitas statusas T sritis chemija apibrėžtis Netolygiai grūdėtos sandaros koryta efuzinė uoliena. atitikmenys: angl. trachyte rus. трахит …   Chemijos terminų aiškinamasis žodynas

  • trachyte — noun Etymology: French, from Greek trachys rough Date: 1821 a usually light colored volcanic rock consisting chiefly of potash feldspar …   New Collegiate Dictionary

  • trachyte — noun a pale igneous rock consisting mostly of potassium feldspar and plagioclase See Also: trachytic, trachytoid …   Wiktionary

  • trachyte — (tra chi t ) s. m. Terme de géologie. Classe feldspathique de roches volcaniques à pâte grossière, celluleuse, âpre au toucher. ÉTYMOLOGIE    Du grec, rude …   Dictionnaire de la Langue Française d'Émile Littré

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