foliation

foliation
/foh'lee ay"sheuhn/, n.
1. the act or process of putting forth leaves.
2. the state of being in leaf.
3. Bot.
a. the arrangement of leaves within a bud.
b. the arrangement of leaves on a plant.
4. leaves or foliage.
5. Print. the consecutive numbering of the folios or leaves, as distinguished from pages, of a manuscript or book.
6. the total number of such leaves.
7. Petrol. a form of lamination produced in rocks by metamorphism.
8. ornamentation with foliage, or an arrangement of foliage.
9. Archit.
a. ornamentation with foils.
b. ornamentation with representations of foliage.
10. formation into thin sheets.
11. the application of foil to glass to make a mirror.
[1615-25; FOLIATE + -ION]

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Planar arrangement of structural or textural features in any rock type, but particularly that resulting from the alignment of constituent mineral grains of a metamorphic rock along straight or wavy planes.

Foliation commonly occurs parallel to original bedding, but it may not be obviously related to any other structural direction. Foliation is exhibited most prominently by sheety minerals, such as mica or chlorite.

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      planar arrangement of structural or textural features in any rock type, but particularly that resulting from the alignment of constituent mineral grains of a metamorphic rock of the regional variety along straight or wavy planes. Foliation often occurs parallel to original bedding, but it may not be ostensibly related to any other structural direction. Foliation is exhibited most prominently by sheety minerals, such as mica or chlorite.

      Regional metamorphic rocks are usually subdivided into schist, slate, and gneiss on the basis of grain size and foliation type. The schists, for example, exhibit strong foliation with partings along well-defined planes of medium-grained micas or hornblendes. The gneisses (gneiss), which are characteristically rich in feldspar and quartz, tend to be coarse-grained and less distinctly foliated. They do not split, or cleave, along their planes as schists do. A few contact-metamorphic rocks are foliated, but most, such as hornfels and granulite, tend to be granular.

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Universalium. 2010.

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Look at other dictionaries:

  • foliation — [ fɔljasjɔ̃ ] n. f. • 1757; du lat. folium « feuille » 1 ♦ Bot. Disposition des feuilles sur la tige. Développement des feuilles. ⇒ feuillaison. 2 ♦ Géol. Structure en feuillets observée dans certaines roches. ● foliation nom féminin (latin… …   Encyclopédie Universelle

  • Foliation — Fo li*a tion, n. [Cf. F. foliation.] 1. The process of forming into a leaf or leaves. [1913 Webster] 2. The manner in which the young leaves are dispo?ed within the bud. [1913 Webster] The . . . foliation must be in relation to the stem. De… …   The Collaborative International Dictionary of English

  • foliation — (n.) 1620s, from Fr. foliation or directly from L. foliatus (see FOLIATE (Cf. foliate)) …   Etymology dictionary

  • Foliation — (v. lat.), die Belaubung, der Act, wodurch eine Pflanze Blätter erhält, od. auch die Gesammtheit der Blätter. Foliatus, beblättert …   Pierer's Universal-Lexikon

  • Foliation — Foliation, lat. deutsch, das Ausschlagen der Bäume …   Herders Conversations-Lexikon

  • foliation — [fō΄lē ā′shən] n. [ML foliatio: see FOLIATE] 1. a growing of or developing into a leaf or leaves; leaf formation 2. the state of being in leaf 3. the way leaves are arranged in the bud; vernation 4. the act or process of beating metal into layers …   English World dictionary

  • Foliation — In mathematics, a foliation is a geometric device used to study manifolds. Informally speaking, a foliation is a kind of clothing worn on a manifold, cut from a striped fabric. On each sufficiently small piece of the manifold, these stripes give… …   Wikipedia

  • Foliation — La foliation (du latin folium, feuille) est une structuration en plans distincts des roches métamorphiques. La structure est marquée par l orientation préférentielle de minéraux visibles à l œil nu le plus souvent les micas et aussi en… …   Wikipédia en Français

  • FOLIATION — n. f. T. de Botanique Disposition des feuilles autour de la tige. Il se dit aussi du Moment où les bourgeons commencent à développer leurs feuilles. L’époque de la foliation. Dans ce sens il est synonyme de FEUILLAISON …   Dictionnaire de l'Academie Francaise, 8eme edition (1935)

  • foliation — sluoksniavimasis statusas T sritis chemija apibrėžtis Išsiskirstymas sluoksniais. atitikmenys: angl. delamination; exfoliation; foliation; lamination; settling; splitting; stratification rus. расслаивание; расслоение …   Chemijos terminų aiškinamasis žodynas

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