English definition of Gneiss

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Definition of gneiss

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Gneiss (n.) A crystalline rock, consisting, like granite, of quartz, feldspar, and mica, but having these materials, especially the mica, arranged in planes, so that it breaks rather easily into coarse slabs or flags. Hornblende sometimes takes the place of the mica, and it is then called hornblendic / syenitic gneiss. Similar varieties of related rocks are also called gneiss..

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Protogine :: Protogine (n.) A kind of granite or gneiss containing a silvery talcose mineral.

Graduate :: Graduate (v. i.) To pass by degrees; to change gradually; to shade off; as, sandstone which graduates into gneiss; carnelian sometimes graduates into quartz..

Zeolite :: Zeolite (n.) A term now used to designate any one of a family of minerals, hydrous silicates of alumina, with lime, soda, potash, or rarely baryta. Here are included natrolite, stilbite, analcime, chabazite, thomsonite, heulandite, and others. These species occur of secondary origin in the cavities of amygdaloid, basalt, and lava, also, less frequently, in granite and gneiss. So called because many of these species intumesce before the blowpipe..

Gneissoid :: Gneissoid (a.) Resembling gneiss; having some of the characteristics of gneiss; -- applied to rocks of an intermediate character between granite and gneiss, or mica slate and gneiss..

Gneissic :: Gneissic (a.) Relating to, or resembling, gneiss; consisting of gneiss..

Granite :: Granite (n.) A crystalline, granular rock, consisting of quartz, feldspar, and mica, and usually of a whitish, grayish, or flesh-red color. It differs from gneiss in not having the mica in planes, and therefore in being destitute of a schistose structure..

Gneiss :: Gneiss (n.) A crystalline rock, consisting, like granite, of quartz, feldspar, and mica, but having these materials, especially the mica, arranged in planes, so that it breaks rather easily into coarse slabs or flags. Hornblende sometimes takes the place of the mica, and it is then called hornblendic / syenitic gneiss. Similar varieties of related rocks are also called gneiss..

Granitoid :: Granitoid (a.) Resembling granite in granular appearance; as, granitoid gneiss; a granitoid pavement..

Gneissose :: Gneissose (a.) Having the structure of gneiss.

Hypogene :: Hypogene (a.) Formed or crystallized at depths the earth's surface; -- said of granite, gneiss, and other rocks, whose crystallization is believed of have taken place beneath a great thickness of overlying rocks. Opposed to epigene..