halloysite

[ huh-loi-sahyt, -zahyt, ha- ]
/ həˈlɔɪ saɪt, -zaɪt, hæ- /

noun

a refractory clay mineral similar in composition to kaolinite.

Origin of halloysite

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