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biotite

   Also found in: Encyclopedia, Wikipedia, Hutchinson 0.06 sec.
bi·o·tite  (b-tt)
n.
A dark-brown or dark-green to black mica, K(Mg,Fe)3(Al,Fe)Si3O10(OH)2, found in igneous and metamorphic rocks.

[After Jean Baptiste Biot (1774-1862), French physicist.]

bio·titic (-ttk) adj.

biotite  (b-tt)
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.
ThesaurusLegend:  Synonyms Related Words Antonyms
Noun1.biotite - dark brown to black mica found in igneous and metamorphic rock
lepidomelane - a mica that is a biotite containing iron
isinglass, mica - any of various minerals consisting of hydrous silicates of aluminum or potassium etc. that crystallize in forms that allow perfect cleavage into very thin leaves; used as dielectrics because of their resistance to electricity


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? Mentioned in ? References in periodicals archive
 
The metamorphosed alteration zones are characterized by the presence of various combinations of anthophyllite, cordierite, garnet, staurolite, biotite and/ or andalusite.
A poor correlation between the concentration of Fe and As in groundwater from Semaria may be caused by the presence of dissolved Fe in groundwater, which may be partly derived from the weathering of biotite, and by the variable Fe:As ratio in dissolved FeOOH (McArthur et al.
The sedimentary rocks have been metamorphosed to biotite hornfels around the contact of the intrusive.
 
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