non·tron·ite | \ˈnän‧trəˌnīt\
plural -s

Definition of nontronite 

: 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

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History and Etymology for nontronite

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

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one that holds something together

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