[huh-loi-sahyt, -zahyt, ha-]
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

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To halloysite
Encyclopedia Britannica


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. Seekaolinite.

Learn more about halloysite with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
Cite This Source
Example sentences
Halloysite also may be more affected by chemicals than kaolinite.
Criteria for the characterization of kaolinite, halloysite, and a related mineral in clays and soils.
The minerals of the bauxite ores include mainly monohydrate and halloysite.
Copyright © 2014 Dictionary.com, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature