allophane

allophane
noun Etymology: Greek allophanēs appearing otherwise, from all- + phainesthai to appear, middle voice of phainein to show — more at fancy Date: circa 1821 an amorphous translucent mineral of various colors often occurring in incrustations or stalactite forms and consisting of a hydrous aluminum silicate

New Collegiate Dictionary. 2001.

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

  • allophane — ● allophane nom féminin Variété d argile colloïdale, mélange de silicates d aluminium hydratés ou prédomine l halloysite, abondante dans les sols développés sur roches volcaniques basiques. ⇒ALLOPHANE, subst. fém. MINÉR. Variété d argile,… …   Encyclopédie Universelle

  • Allophane — is an amorphous hydrous aluminium silicate clay mineral . Its chemical formula is Al2O3·(SiO2)1.3 2·2.5 3(H2O). Although it has a variable composition and although generally amorphous in structure, it has long been recognized as a mineral and can …   Wikipedia

  • Allophane —   [griechisch phaínesthai »erscheinen«], Singular Allophan der, s, wasserreiche, durch Verwitterung hauptsächlich in jungen Böden, v. a. auf vulkanischen Aschen, gebildete, nahezu amorphe Tonminerale. Allophane bilden sehr kleine Teilchen mit… …   Universal-Lexikon

  • allophane — [al′ō fān΄, al′əfān΄] n. [ ALLO + PHANE, as in Gr allophanēs, appearing otherwise: so named because it changes appearance under the blowpipe] a soft clay mineral, a translucent, hydrous silicate of aluminum, of varying composition and color,… …   English World dictionary

  • allophane — alofanas statusas T sritis chemija apibrėžtis Mineralas. formulė xAl₂O₃·ySiO₂·H₂O; čia x:y = 1:1 atitikmenys: angl. allophane rus. аллофан …   Chemijos terminų aiškinamasis žodynas

  • allophane — /al euh fayn /, n. a clay mineral, an amorphous hydrous silicate of aluminum, occurring in blue, green, or yellow, resinous to earthy masses. [1835 45; < Gk allophanés, equiv. to allo ALLO + phan (s. of phaínesthai to appear) + es adj. suffix] *… …   Universalium

  • allophane — noun An amorphous hydrous aluminium silicate clay mineral …   Wiktionary

  • allophane — (al lo fa n ) s. f. Terme de minéralogie. Variété d argile …   Dictionnaire de la Langue Française d'Émile Littré

  • allophane — al·lo·phane …   English syllables

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