eastonite

noun

eas·​ton·​ite

ˈēstəˌnīt

plural -s

often capitalized

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

Word History

Etymology

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

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