TERMIUM Plus®

The Government of Canada’s terminology and linguistic data bank.

ALLOPHANE [1 record]

Record 1 2004-11-29

English

Subject field(s)
  • Geochemistry
  • Mineralogy
DEF

An amorphous hydrated aluminosilicate of variable composition.

DEF

An amorphous clay mineral [which] consists of a hydrous aluminum gel ... with minor amounts of bases and accessory acid radicals ...

OBS

... first named by Stromeyer and Hausmann in 1816, from the Greek for "other" and "appear," in allusion to its change in appearance under the blowpipe.

French

Domaine(s)
  • Géochimie
  • Minéralogie
DEF

Variété d'argile colloïdale, mélange de silicates d'aluminium hydratés où prédomine l'halloysite, particulièrement abondante dans les andosols dus à l'altération des roches volcaniques basiques.

CONT

En climat tempéré, on note souvent une transformation progressive des illites et des chlorites en montmorillonite et même en allophanes (gels silico-alumineux).

OBS

Certains auteurs emploient le terme allophane au féminin (ex. : Grand dictionnaire Larousse encyclopédique [LAROG 1982], mais la plupart des ouvrages spécialisés le mettent au masculin (ex. : Dictionnaire de la chimie et de ses applications [DCHIM 1978] et Dictionnaire de géologie, de Foucault et Raoult [FOUGE 1995]).

Spanish

Campo(s) temático(s)
  • Geoquímica
  • Mineralogía
DEF

Silicato de aluminio hidratado que resulta de la meteorización de las rocas silicatadas.

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