cummingtonite

noun

cum·​ming·​ton·​ite

ˈkəmiŋtəˌnīt

plural -s

: a mineral (Fe, Mg)₇Si₈O₂₂(OH)₂ consisting of an ironmagnesium amphibole isomorphous with anthophyllite

Word History

Etymology

Cummington, Massachusetts + English -ite

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