nontronite

noun

non·​tron·​ite

ˈnän‧trəˌnīt

plural -s

: a pale yellow or greenish clay mineral that consists chiefly of hydrous iron silicate and is classed as montmorillonite in which iron has replaced more or less of the aluminum

Word History

Etymology

French nontronite, from Nontron, town in southwest France + French -ite

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