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hectorite

noun hec·tor·ite \ ˈhektəˌrīt \
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Definition of hectorite

plural -s
: a mineral (Mg,Li)3Si4O10(OH)2 consisting of a hydrous silicate of magnesium and lithium — compare montmorillonite

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Origin and Etymology of hectorite

Hector, California, its locality + English -ite

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