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biotite

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WordReference Random House Unabridged Dictionary of American English © 2026

bi•o•tite n.

Mineralogya 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.

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

bi•o•tit•ic adj.

'biotite' also found in these entries (note: many are not synonyms or translations):

Biot-Savart law - andesite - anomite - granite - granitite - minette - syenite - trondhjemite

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