iddingsite

noun

id·​dings·​ite

ˈidiŋˌzīt

plural -s

: a mineral consisting of a silicate of calcium, magnesium, and iron of doubtful composition and forming pseudomorphs after olivine

Word History

Etymology

Joseph P. Iddings †1920 American geologist + English -ite

First Known Use

1893, in the meaning defined above

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