/heuh loy"suyt, -zuyt, ha-/, n.
a refractory clay mineral similar in composition to kaolinite.
[1820-30; after Jean-Baptiste-Julien Omalius d'Halloy (1783-1875), Belgian geologist; with -site for -ITE1, after mineral names formed from surnames ending in s]

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      clay mineral that occurs in two forms: one is similar in composition to kaolinite, and the other is hydrated. Both forms have a lower specific gravity than kaolinite, are fibrous rather than platy, and may exhibit a prismatic tubular shape. See kaolinite.

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Universalium. 2010.

Look at other dictionaries:

  • Halloysite — 7Å [1] Catégorie IX : silicates[2] …   Wikipédia en Français

  • Halloysite — is a 1:1 aluminosilicate clay mineral with the empirical formula Al2Si2O5(OH)4. Its main constituents are aluminium (20.90%), silicon (21.76%), and hydrogen (1.56%). Halloysite typically forms by hydrothermal alteration of alumino silicate… …   Wikipedia

  • halloysite — ● halloysite nom féminin (de O. d Halloy, nom propre) Silicate hydraté naturel d aluminium, proche du kaolin, appartenant au groupe des argiles. ⇒HALLOYSITE, subst. fém. MINÉR. Silicate naturel hydraté d aluminium, voisin du kaolin. L halloysite… …   Encyclopédie Universelle

  • Halloysite — Hal*loy site (h[a^]l*loi s[imac]t), n. [Named after Omalius d Halloy.] (Min.) A claylike mineral, occurring in soft, smooth, amorphous masses, of a whitish color. [1913 Webster] …   The Collaborative International Dictionary of English

  • halloysite — Clay Clay (kl[=a]), n. [AS. cl[=ae]g; akin to LG. klei, D. klei, and perh. to AS. cl[=a]m clay, L. glus, gluten glue, Gr. gloio s glutinous substance, E. glue. Cf. {Clog}.] 1. A soft earth, which is plastic, or may be molded with the hands,… …   The Collaborative International Dictionary of English

  • halloysite — (entrée créée par le supplément) (a loi zi t ) s. f. Terme de minéralogie. Silicate alumineux …   Dictionnaire de la Langue Française d'Émile Littré

  • halloysite — hal·loy·site …   English syllables

  • halloysite — həˈlȯiˌsīt, haˈ , ˌzīt noun ( s) Etymology: French, from Omalius d Halloy died 1875 Belg. geologist + French ite : a clay mineral Al2Si2O5(OH)4.nH2O occurring in soft white or light colored masses and in at least two states of hydration …   Useful english dictionary

  • clay mineral — any of a group of hydrous aluminum silicate minerals, as kaolinite, illite, and montmorillonite, that constitute the major portion of most clays. [1945 50] * * * Any of a group of important hydrous aluminum silicates with a layered structure and… …   Universalium

  • Clay minerals — Oxford Clay (Jurassic) exposed near Weymouth, England. Clay minerals are hydrous aluminium phyllosilicates, sometimes with variable amounts of iron, magnesium, alkali metals, alkaline earths, and other cations. Clays have structures similar to… …   Wikipedia

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