biotite

[ bahy-uh-tahyt ]
/ ˈbaɪ əˌtaɪt /

noun

a very common mineral of the mica group, occurring in black, dark-brown, or dark-green sheets and flakes: an important constituent of igneous and metamorphic rocks.

Origin of biotite

1860–65; named after J. B. Biot (1774–1862), French mineralogist and mathematician; see -ite1

OTHER WORDS FROM biotite

bi·o·tit·ic [bahy-uh-tit-ik] /ˌbaɪ əˈtɪt ɪk/, adjective

Example sentences from the Web for biotite

British Dictionary definitions for biotite

biotite
/ (ˈbaɪəˌtaɪt) /

noun

a black or dark green mineral of the mica group, found in igneous and metamorphic rocks. Composition: hydrous magnesium iron potassium aluminium silicate. Formula: K(Mg,Fe) 3 (Al,Fe)Si 3 O 10 (OH) 2 . Crystal structure: monoclinic

Derived forms of biotite

biotitic (ˌbaɪəˈtɪtɪk), adjective

Scientific definitions for biotite

biotite
[ bīə-tīt′ ]

A dark-brown or dark-green to black mica. Biotite is monoclinic and is found in igneous, metamorphic, and sedimentary rocks. Chemical formula: K(Mg,Fe)3(Al,Fe)Si3O10(OH)2.