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jefferisite

noun
jef·​fer·​is·​ite | \ ˈjef(ə)rə̇ˌsīt\
plural -s

Definition of jefferisite

: a mineral consisting of a vermiculite containing iron, aluminum, and magnesium

History and Etymology for jefferisite

William W. Jefferis †1906 American banker + English -ite

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