Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A dark-brown or dark-green to black mica, K(Mg,Fe)3(Al,Fe)Si3O10(OH)2, found in igneous and metamorphic rocks.
from The Century Dictionary.
- noun An important member of the mica group of minerals. See
mica .
from the GNU version of the Collaborative International Dictionary of English.
- noun (Min.) Mica containing iron and magnesia, generally of a black or dark green color; -- a common constituent of crystalline rocks. See
mica .
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun mineralogy A dark brown
mica ; it is a mixedaluminosilicate andfluoride ofpotassium ,magnesium andiron .
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun dark brown to black mica found in igneous and metamorphic rock
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
from Wiktionary, Creative Commons Attribution/Share-Alike License
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Examples
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In certain minerals, notably the brown variety of mica known as biotite, the microscope reveals minute circular marks occurring here and there, quite irregularly.
The Birth-Time of the World and Other Scientific Essays John Joly 1895
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Furthermore, their model included a second mineral called biotite, surrounding a zircon core.
Reasons to Believe - 2009
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And micas such as biotite have been found in regions containing evidence of the earliest life-forms, which are believed to have existed about 3.8 million years ago.
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And micas such as biotite have been found in regions containing evidence of the earliest life-forms, which are believed to have existed about 3.8 million years ago.
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And micas such as biotite have been found in regions containing evidence of the earliest life-forms, which are believed to have existed about 3.8 million years ago.
PhysOrg.com - latest science and technology news stories 2010
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He also put a challenge to geologists to to synthesize "a hand-sized specimen of a typical biotite-bearing granite" as a test and was dismissed, G.
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Cape Maclear at the north end is rocky, predominantly biotite-granite.
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He also put a challenge to geologists to to synthesize "a hand-sized specimen of a typical biotite-bearing granite" as a test and was dismissed, G.
Archive 2009-06-01 2009
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Vermiculite is formed by the alteration and/or weathering of the minerals biotite and phlogopite.
Vermiculite 2008
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Black biotite contains potassium, iron, and magnesium.
Mica 2008
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