noun, often capitalized
eas·ton·ite | \ˈēstəˌnīt\
plural -s

Definition of eastonite 

: a mineral K2Mg5AlSi5Al3O20(OH)4 consisting of basic silicate of potassium, aluminum, and magnesium and being an end-member of the biotite system

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History and Etymology for eastonite

Easton, city in eastern Pennsylvania, its locality + English -ite

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to reject or criticize sharply

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