Halloysite definitions

hə-loi'sīt, -zīt
A porcelainlike clay aluminosilicate mineral, Al2 SiO5 (OH)4 · 2H2 O, consisting of small, slender tubes and formed by the weathering of other aluminosilicate minerals.
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Origin of halloysite

After Jean-Baptiste-Julien d'Omalius d'Halloy (1783–1875), Belgian geologist