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biotite

[bahy-uh-tahyt] /ˈbaɪ əˌtaɪt/
noun
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.
Origin
1860-1865
1860-65; named after J. B. Biot (1774-1862), French mineralogist and mathematician; see -ite1
Related forms
biotitic
[bahy-uh-tit-ik] /ˌbaɪ əˈtɪt ɪk/ (Show IPA),
adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for biotitic

biotite

/ˈbaɪəˌtaɪt/
noun
1.
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)Si3O10(OH)2. Crystal structure: monoclinic
Derived Forms
biotitic (ˌbaɪəˈtɪtɪk) adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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biotitic in Science
biotite
  (bī'ə-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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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