Gneiss
Gneiss Gneiss (n[imac]s), n. [G.] (Geol.) 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 gneiss} or {syenitic gneiss}. Similar varieties of related rocks are also called gneiss. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

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  • Gneiss — rock Augen gneiss from Rio de Janeiro, Brazil …   Wikipedia

  • gneiss — [ gnɛs ] n. m. • 1779; all. Gneis ♦ Géol., minér. Roche métamorphique à grain grossier, où alternent les plages claires (quartz, feldspath) et foncées (mica, amphibole). ● gneiss nom masculin (allemand Gneiss) Roche métamorphique foli …   Encyclopédie Universelle

  • gneiss — gneiss; gneiss·oid; or·tho·gneiss; para·gneiss; gneiss·ic; gneiss·ose; …   English syllables

  • gneiss — ġnèiss s.m.inv. TS petr. roccia metamorfica, molto comune, di colore grigio chiaro, costituita in prevalenza da quarzo, feldspati e miche, utilizzata come materiale da costruzione {{line}} {{/line}} VARIANTI: gnais, gneis. DATA: 1796. ETIMO: dal… …   Dizionario italiano

  • gneiss — 1757, from Ger. Gneiss type of metamorphic rock, probably from M.H.G. gneist spark (so called because the rock glitters), from O.H.G. gneisto spark (Cf. O.E. gnast spark, O.N. gneisti) …   Etymology dictionary

  • gneiss — [nīs] n. [Ger gneis < OHG gneisto, a spark, akin to ON gneisti, OE gnast: from the luster of certain of the components] a coarsegrained, metamorphic rock resembling granite, consisting of alternating layers of different minerals, such as… …   English World dictionary

  • gneiss — gneissic, adj. /nuys/, n. a metamorphic rock, generally made up of bands that differ in color and composition, some bands being rich in feldspar and quartz, others rich in hornblende or mica. [1750 60; < G] * * * Medium to coarse grained… …   Universalium

  • Gneiss — Orthogneiss de la zone de cisaillement de l Ailao Shan Fleuve Rouge en Chine. Source [1]. Le gneiss est une roche métamorphique contenant du quartz, du mica, des feldspaths plagioclases et parfois du feldspath alcalin, tous suffi …   Wikipédia en Français

  • gneiss — [[t]naɪs[/t]] n. pet a metamorphic rock, generally made up of bands that differ in color and composition, some bands being rich in feldspar and quartz, others rich in hornblende or mica • Etymology: 1750–60; < G Gneis, ult. der. of OHG gneisto …   From formal English to slang

  • gneiss — (ghnès) s. m. Terme de minéralogie. Roche composée de feldspath et de mica. Gneiss talqueux ou amphibolique, celui dans lequel le talc ou l amphibole remplace le mica. ÉTYMOLOGIE    Mot d origine saxonne, qui a passé des mineurs de Saxe dans la… …   Dictionnaire de la Langue Française d'Émile Littré

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