biotite
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
1Other words from biotite
- bi·o·tit·ic [bahy-uh-tit-ik], /ˌbaɪ əˈtɪt ɪk/, adjective
Words Nearby biotite
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use biotite in a sentence
Hornblende and biotite are the ferromagnesian constituents and vary much in relative importance.
Mount Rainier | Variousbiotite, if present, is brown; epidote is yellow or colourless; rutile, apatite and quartz all occur with some frequency.
Minettes contain biotite and orthoclase; kersantites, biotite and plagioclase.
Both in the hand specimens and in microscopic slides of lamprophyric rocks biotite and hornblende are usually conspicuous.
A special group of monchiquites rich in deep brown biotite has been called fourchites (after the Fourche Mountains, Arkansas).
British Dictionary definitions for biotite
/ (ˈbaɪəˌtaɪt) /
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
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
Scientific definitions for 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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Browse