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单词 halloysite
释义

halloysite


hal·loy·site

H5031550 (hə-loi′sīt, -zīt)n. A porcelainlike clay aluminosilicate mineral, Al2SiO5(OH)4·2H2O, consisting of small, slender tubes and formed by the weathering of other aluminosilicate minerals.
[After Jean-Baptiste-Julien d'Omalius d'Halloy (1783-1875), Belgian geologist.]

halloysite

(ˈhælɔɪˌzaɪt) n (Geological Science) mineralogy a white mineral, like clay in texture, which is composed of aluminium and silicon

Halloysite


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.

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.

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更新时间:2025/2/22 18:42:49