biotite

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Related to biotites: Black mica

bi·o·tite

 (bī′ə-tīt′)
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.]

bi′o·tit′ic (-tĭt′ĭk) adj.

biotite

(ˈbaɪəˌtaɪt)
n
(Minerals) 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
biotitic adj

bi•o•tite

(ˈbaɪ əˌtaɪt)

n.
a mica occurring in black, dark brown, or dark green sheets and flakes: an important constituent of igneous and metamorphic rocks.
[1860–65; after J. B. Biot (1774–1862), French mineralogist; see -ite 1]
bi`o•tit′ic (-ˈtɪt ɪk) adj.

bi·o·tite

(bī′ə-tīt′)
A dark-brown to black mica found in igneous and metamorphic rocks.
ThesaurusAntonymsRelated WordsSynonymsLegend:
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
References in periodicals archive ?
Previous studies also indicate that the chemical composition of biotites in granites is controlled by conditions of magma cooling and crystallization; these conditions include oxygen fugacity, temperature, and pressure.
Biotites are widespread in the Wushan granodiorite.
During the hydrolysis reaction at an initial stage of weathering, it is quite likely that feldspars and biotites were dissolved to produce soluble Al in solution, which then crystallised as gibbsite on a solid mineral surface.
86]Sr ratios of included biotites compared to their K-feldspar megacryst host, and to the matrix biotite of the enclosing rock (Table 2).
From China, too, an interesting paper about the petrography and mineralogy of biotites within the Wushan granodiorite is presented.
In the grains are enclosed smaller subhedral biotites, muscovites and plagioclases.
1979, Increased selectivity of naturally weathered biotites for potassium, Soil Science Society of America Journal, 43, No.
The samples of amphibole-biotite gneiss, biotite amphibolite, apoeclogitic garnet amphibolite, apogabbroic amphibolite etc.
Textures indicate that the monazite-producing reaction in the rock matrix was apatite + biotite a muscovite + monazite.
1993) described similar weathering of biotite and its t ransformation into vermiculite from volcaniclastites in central Italy, including the presence of hydrobiotite interstratified phase with a strong tendency towards regularity.