Halloysite


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Related to Halloysite: Nontronite, beidellite

halloysite

[hə′lȯi‚sīt]
(mineralogy)
Al2Si2O5(OH)4·2H2O Porcelainlike clay mineral whose composition is like that of kaolinite but contains more water and is structurally distinct; varieties are known as metahalloysites.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Halloysite

 

(named for the Belgian geologist J. B. Omalius d’Halloy, 1783-1875), a claylike mineral of the group of layered silicates having the chemical composition Al4[Si4O10](OH)8·4H2O. It is close in composition to kaolinite, from which it is distinguished by a higher water content. Halloysite crystallizes in a monoclinic system. It is found in the form of claylike crypto-crystalline aggregates. The coloration is usually white but can sometimes be from yellowish to brown (from iron oxides), with a dull luster. Its hardness on the mineralogical scale is one to two; its density is 2,000 to 2,200 kg/m3. Halloysite is a typical product of the weathering of the aluminum silicates of igneous rocks, especially feldspars. It is common, but large accumulations are unusual.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Nayak, Mechanical and morphological properties of halloysite nanotubes filled ethylene-vinyl acetate copolymer nanocomposites, Indian J.
At lower concentration (0.5 M; Hashimoto and Jackson (1958)), NaOH dissolved amorphous Al species, poorly crystalline Al oxides, SRO silicates, halloysite and partly gibbsite (Kitagawa 1976; Barreal et al.
Lvov, "Nanotubular halloysite clay as efficient water filtration system for removal of cationic and anionic dyes," in Proceedings of the 2nd International Conference on Structural Nano Composites, NANOSTRUC 2014, May 2014.
Nanocontainers included the halloysite clay nanotubes [221-223], zirconia nanospheres [224], nanosilica [225-227], nanoceria [228, 229], and supramolecular nanocontainers [230, 231].
Halloysite clay company Applied Minerals Inc (Other OTC:AMNL) announced on Tuesday that it recorded an operating loss of USD4.6m for the full year ended 31 December 2016.
Jiang et al., "Effect of halloysite nanotubes on thermal and flame retardant properties of polyamide 6/melamine cyanurate composites," Polymer Composites, vol.
On the other hand, some fillers, such as halloysite and ZnO, have been reported to affect the morphology of electrospun nanofibres--these fibres result in bead formation along the nanofibres [19, 35].
Chemistry, Properties, and Applications of Halloysite Clay and Advanced Natural Iron Oxides in Coatings--Brian Newsome, Applied Minerals Inc.
The minerals of the kaolin group comprises kaolinite, dickite, nacrite, and halloysite with kaolinite being the most common (Murray, 2007).
(8.) Shchukin, DG, Lamaka, SV, Yasakau, KA, Zheludkevich, ML, "Active Anticorrosion Coatings with Halloysite Nanocontainers." J.