biotite

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biotite

biotite , iron-rich variety of phlogopite, most abdunant of the mica minerals.

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biotite

A Dictionary of Earth Sciences | 1999 | | Â© A Dictionary of Earth Sciences 1999, originally published by Oxford University Press 1999. (Hide copyright information) Copyright

biotite An important rock-forming silicate mineral; a member of the mica group K₂(Mg,Fe)₆[Si₃AlO₁₀]₂(OH,F)₄, in which the Mg/Fe ratio is less than 2:1; biotite forms a series with phlogopite (of similar composition, but with Mg/Fe greater than 2:1) and may have Fe³⁺, Ti⁴⁺, and Al³⁺ also present in the formula; sp. gr. 2.7–3.3; hardness 2–3; monoclinic; black, dark brown, or greenish-black; vitreous to sub-metallic lustre; crystals tabular and pseudo-hexagonal, with lamellar aggregates and flakes; cleavage perfect basal {001}; occurs in granites, syenites, and diorites, in schists and gneisses, in contact metamorphic rocks, and often in sedimentary rocks.

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AILSA ALLABY and MICHAEL ALLABY. "biotite." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 18 Dec. 2009 <http://www.encyclopedia.com>.

AILSA ALLABY and MICHAEL ALLABY. "biotite." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (December 18, 2009). http://www.encyclopedia.com/doc/1O13-biotite.html

AILSA ALLABY and MICHAEL ALLABY. "biotite." A Dictionary of Earth Sciences. 1999. Retrieved December 18, 2009 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-biotite.html

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	Composition of Biotites from Cierna Hora Granitoids (Western Carpathians) as an Indicator of the Granite Tectonic Setting Magazine article from: Geolines; 1/1/2006; ; 700+ words ; ...of primary accessories trapped during biotite growth suggests the magmatic origin of biotite. The analysed biotites exhibit a fairly wide range of X^sub...content atoms per formula unit (apfu). Biotite from Tahanovce area is characterised...
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	[sup.40]Ar/[sup.39]Ar dates on hornblende, muscovite, and biotite from the Mica Creek area, British Columbia: regional metamorphic and tectonic implications. Magazine article from: Canadian Journal of Earth Sciences; 1/1/2006; ; 700+ words ; ...sup.39]Ar dates on muscovite, biotite, and hornblende from some of the same...39]Ar sur de la muscovite, de la biotite et du hornblende, effectuees a partir...sup.39]Ar dates on muscovite, biotite, and hornblende in an attempt to set...
	Mercury concentrations in the bedrock of southwestern Nova Scotia: a reconnaissance study. Magazine article from: Atlantic Geology; 3/1/2005; ; 700+ words ; ...underlying bedrock, we present Hg analyses of biotite-rich granitoid, muscovite-rich granitoid...Granodiorite, which contains up to 32% biotite. The muscovite-rich granitoid rocks...in bedrock and the modal abundance of biotite. This study, together with previous...
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