essexite

noun

es·​sex·​ite

-sikˌsīt,

-sēk-

plural -s

: granular intrusive igneous rock of various kinds composed chiefly of hornblende, augite, and labradorite with variable amounts of accessory iron ore, biotite, orthoclase, nepheline, or olivine

Word History

Etymology

Essex county, Massachusetts + English -ite

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