biotite

noun
bi·o·tite | \ˈbī-ə-ˌtīt \

Definition of biotite 

: a generally black or dark green form of mica that is a constituent of crystalline rocks and consists of a silicate of iron, magnesium, potassium, and aluminum

Other Words from biotite

biotitic \ˌbī-ə-ˈti-tik \ adjective

First Known Use of biotite

1848, in the meaning defined above

History and Etymology for biotite

German Biotit, from Jean B. Biot †1862 French mathematician

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The first known use of biotite was in 1848

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