halloysite

[huh-loi-sahyt, -zahyt, ha-]
noun
a refractory clay mineral similar in composition to kaolinite.

Origin:
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

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Encyclopedia Britannica
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halloysite

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.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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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.
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