illite

noun
il·lite | \ ˈi-ˌlīt \

Definition of illite 

: any of a group of clay minerals having essentially the crystal structure of muscovite

Other words from illite

illitic \i-ˈli-tik \ adjective

First Known Use of illite

1937, in the meaning defined above

History and Etymology for illite

Illinois, state of U.S. + -ite entry 1

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The first known use of illite was in 1937

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