Main Entry: bi·o·tite

Pronunciation: \ˈbī-ə-ˌtīt\

Function: noun

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

Date: 1862

: 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

— bi·o·tit·ic \ˌbī-ə-ˈti-tik\ adjective