glauconite

glauconite
—glauconitic /glaw'keuh nit"ik/, adj.
/glaw"keuh nuyt'/, n.
a greenish micaceous mineral consisting essentially of a hydrous silicate of potassium, aluminum, and iron and occurring in greensand, clays, etc.
[1830-40; < Gk glaukón, neut. of glaukós (see GLAUCO-) + -ITE1]

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 greenish ferric-iron silicate mineral with micaceous structure [(K, Na)(Fe3+,Al, Mg)2(Si, Al)4O10(ΟH)2], characteristically formed on submarine elevations ranging in depth from 30 to 1,000 metres (100 to 3,300 feet) below sea level. Glauconite is abundant only in sea-floor areas that are isolated from large supplies of land-derived sediment.

      Glauconite forms by three principal processes: alteration of the fecal pellets of bottom-dwelling organisms; modification of particles of illitic and biotitic clays by seawater; and direct precipitation from seawater. Particles of glauconite are generally sand-sized or finer.

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Universalium. 2010.

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  • Glauconite — Glauconite[1] Catégorie IX : silicates[2] …   Wikipédia en Français

  • GLAUCONITE — Aluminosilicate ferromagnésien hydraté, de formule (K, Na)(Fe3+, Fe2+, Al, Mg)2 3[Si3 (Si,AL)10](OH)2,4 H2O, la glauconite se cristallise dans le système monoclinique; elle est rarement observée en petits cristaux hexagonaux, mais plutôt en… …   Encyclopédie Universelle

  • Glauconite — Glau co*nite, n. [Cf. F. glauconite, glauconie, fr. L. glaucus. See {Glaucous}.] (Min.) The green mineral characteristic of the greensand of the chalk and other formations. It is a hydrous silicate of iron and potash. See {Greensand}. [1913… …   The Collaborative International Dictionary of English

  • glauconite — [glô′kə nīt΄] n. [Ger glaukonit < Gr glaukon, neut. of glaukos: see GLAUCO ] a greenish silicate of iron and potassium, a kind of mica found in greensand …   English World dictionary

  • Glauconite — Infobox mineral name = Glauconite category = Phyllosilicate mineral boxwidth = boxbgcolor = imagesize = caption = formula = (K,Na,Ca)1.2 2.0(Fe+3,Al,Fe+2,Mg)4 (Si7 7.6Al1 0.4O20)(OH)4·7nH20 [http://www.glossary.oilfield.slb.com/Display.cfm?Term=gl… …   Wikipedia

  • glauconite — glauconie ou glauconite (glô ko nie ou glô ko ni t ) s. f. Terme de minéralogie. Variété de craie …   Dictionnaire de la Langue Française d'Émile Littré

  • glauconite — glaukonitas statusas T sritis chemija apibrėžtis Hidrožėručių grupės mineralas. formulė Formulę žr. priede. priedas( ai) Grafinis formatas atitikmenys: angl. glauconite rus. глауконит …   Chemijos terminų aiškinamasis žodynas

  • glauconite pellets —    Silt to sand sized, nodular aggregates with a characteristic greenish color, dominantly composed of the clay mineral glauconite; formed in near shore marine sediments and subsequently exposed by a drop in sea level or rise of a land mass, as… …   Glossary of landform and geologic terms

  • glauconite — noun Etymology: German Glaukonit, irregular from Greek glaukos Date: 1836 a mineral consisting of a dull green earthy iron potassium silicate occurring in greensand • glauconitic adjective …   New Collegiate Dictionary

  • glauconite — noun A greenish form of mica found in greensand …   Wiktionary

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