Felsite

Felsite

Felsite is a very fine grained volcanic rock that may or may not contain larger crystals. Felsite is a field term for a light colored rock that typically requires petrographic examination or chemical analysis for more precise definition. Color is generally white through light grey, reds to tan and may include any color except dark grey, green or black (the colors of traprock). [ Klein, Cornelis and Cornelius S. Hurlbut, 1986, "Manual of Mineralogy," Wiley, p. 484 ISBN 0-471-80580-7 ] The mass of the rock consists of a fine-grained matrix of felsic materials, particularly quartz, sodium and potassium feldspar, and may be termed a quartz felsite or quartz porphyry if the quartz phenocrysts are present. This rock is typically of volcanic origin, and may be found in association with obsidian and rhyolite. In some cases, it is sufficiently fine-grained for use in making stone tools.

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  • Felsite — couverte de formations dendritiques pyrolusite. La felsite est une roche volcanique qui peut éventuellement contenir des cristaux. Les plus grands gisements de felsite se trouvent en Arménie.[réf. nécessaire] …   Wikipédia en Français

  • Felsite — Fel site, n. [Cf. {Feldspar}.] (Min.) A finegrained rock, flintlike in fracture, consisting essentially of orthoclase feldspar with occasional grains of quartz. [1913 Webster] …   The Collaborative International Dictionary of English

  • felsite — ● felsite nom féminin (de feldspath et de silicate) Roche hololeucocrate à feldspath alcalin et quartz …   Encyclopédie Universelle

  • felsite — s. m. Mineral semelhante ao sílex …   Dicionário da Língua Portuguesa

  • felsite — [fel′sīt΄] n. [< FELSPAR + ITE1] a light colored, dense, fine grained igneous rock consisting mainly of feldspar and quartz …   English World dictionary

  • felsite — felzitas statusas T sritis chemija apibrėžtis Porfyrinių uolienų pagrindinė nevisiškai kristalinė (kriptokristalinė) masė. atitikmenys: angl. felsite rus. фельзит …   Chemijos terminų aiškinamasis žodynas

  • felsite — felzitas statusas T sritis chemija apibrėžtis Stikliška, be intarpų, granitui gimininga efuzinė uoliena. atitikmenys: angl. felsite rus. фельзит …   Chemijos terminų aiškinamasis žodynas

  • Felsite Peak — Infobox Mountain Name=Felsite Peak Photo= Caption= Elevation=2,530 metres (8,301 feet) Location=Yukon, Canada Range=Wrangell Volcanic Field, Coast Mountains Prominence =670 m Coordinates = coord|60|32|58.2|N|138|27|33.5|W|type:mountain… …   Wikipedia

  • felsite — noun Etymology: felspar + ite Date: 1794 a dense igneous rock consisting almost entirely of feldspar and quartz • felsitic adjective …   New Collegiate Dictionary

  • felsite — felsitic /fel sit ik/, adj. /fel suyt/, n. a dense, fine grained, igneous rock consisting typically of feldspar and quartz, both of which may appear as phenocrysts. [1785 95; FELS(PAR) + ITE1] * * * …   Universalium

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