atlantite

noun
at·​lan·​tite | \ətˈlanˌtīt\
plural -s

Definition of atlantite 

: a melanocratic nephelite-basalt rock consisting of plagioclase, augite, and olivine phenocrysts in a groundmass predominantly nephelite

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History and Etymology for atlantite

International Scientific Vocabulary Atlantic + -ite; originally formed as German atlantit; from its occurrence in the Atlantic petrographic province

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