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Meaning of biotite

bi•o•tite

Pronunciation: (bī'u-tīt"), [key]
— n.
  1. 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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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