halloysite

noun
hal·​loy·​site | \həˈlȯiˌsīt, haˈ-, -ˌzīt\
plural -s

Definition of halloysite 

: a clay mineral Al2Si2O5(OH)4.n H2O occurring in soft white or light-colored masses and in at least two states of hydration n =2, n =4

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History and Etymology for halloysite

French, from Omalius d'Halloy †1875 Belgian geologist + French -ite

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