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lepidomelane

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

lepidomelane An iron-rich variety of biotite.

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AILSA ALLABY and MICHAEL ALLABY. "lepidomelane." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 20 Dec. 2009 <http://www.encyclopedia.com>.

AILSA ALLABY and MICHAEL ALLABY. "lepidomelane." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (December 20, 2009). http://www.encyclopedia.com/doc/1O13-lepidomelane.html

AILSA ALLABY and MICHAEL ALLABY. "lepidomelane." A Dictionary of Earth Sciences. 1999. Retrieved December 20, 2009 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-lepidomelane.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...
	Two-mica and biotite granites in the Weitra-Nové Hrady area, Austria - Czech Republic Magazine article from: Journal of the Czech Geological Society; 1/1/2006; ; 700+ words ; ...3) chemically primitive Karlstift biotite granite with high magnetic susceptibility...Sr^sub i^ = 0.706; (4) Weitra biotite granite with a magnetic and a non-magnetic...formerly used for all the fine-grained (biotite and/or two-mica) granites through...
	The chemical composition of biotite from granitic pegmatites and from metamorphic emerald deposits in the Eastern Brazilian Pegmatite Province Magazine article from: Mineralogical Record; 3/1/2000; ; 700+ words ; The Chemical Composition of Biotite from Granitic Pegmatites and from Metamorphic...border of pegmatite bodies. However, biotite-rich zones are also found in the...pegmatites without emerald mineralization. Biotite in biotitites reaches a grain-size...
	The Kaplice dyke swarm of biotite granodiorite porphyry and its relationship to the Freistadt granodiorite, Moldanubian Batholith Magazine article from: Journal of the Czech Geological Society; 1/1/2005; ; 700+ words ; ...granodiorite was studied. The swarm of biotite granodiorite porphyry dykes is associated...porphyritic structure in which plagioclase, biotite quartz phenocrysts combined represent...emplacement level. The composition of biotite granodiorite porphyry dykes is characterized...
	Starfield Resources Inc. - Confirmation Assays Increase Platinum And Rhodium Up To 30% - Hole FL02-101W-1 Extends Biotite Alteration Zone. Business Wire; 4/24/2002; 700+ words ; ...hosted by a distinct, fine-grained biotite-rich horizon containing no sulphide...020 meters and intersected two zones of biotite alteration within the host gabbro unit...of relatively coarse-grained, black biotite alteration within gabbro intercepted 3...
	Retrograde metamorphism in a regional shear zone and related chemical changes: The Kaplice Unit of muscovite-biotite gneisses in the Moldanubian Zone of southern Bohemia, Czech Republic Magazine article from: Journal of the Czech Geological Society; 1/1/2005; ; 700+ words ; ...Unit, a regional zone of muscovite-biotite gneisses 558 km in size, was studied...are distinctly depleted in comparison to biotite gneisses of both the Monotonous and the...reactions producing muscovite intergrown with biotite in recrystallized quartz-feldspar fabric...
	[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...
	Petrology, age, and tectonic setting of the Seal Island Pluton, offshore southwestern Nova Scotia. Magazine article from: Canadian Journal of Earth Sciences; 10/1/2007; ; 700+ words ; ...outcrops, the Seal Island Pluton consists of biotite monzogranite and muscovite-biotite monzogranite of uncertain relative age. Metasedimentary...Ordovician Meguma Group. Compared with the biotite monzogranite, the muscovite-biotite monzogranite...
	Petrography and Geochemistry of Granitoids from South Part of Strzelin Crystalline Massif (SW Poland) Magazine article from: Geolines; 1/1/2004; ; 700+ words ; ...consist of plagioclase, quartz, biotite, amphibole, K-feldspar and apatite...normally zoned from 39% An to 33% An. Biotites form large aggregates up to 4 mm...feldspar, plagioclase, muscovite and biotite. Investigated granitoids are mostly...

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Related entries from encyclopedias, dictionaries, and thesauruses

	biotite Book article from: A Dictionary of Earth Sciences biotite An important rock-forming silicate mineral ; a member of the mica group...AlO 10 ] 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...
	stilpnomelane Book article from: A Dictionary of Earth Sciences ...stilpnomelane A phyllosilicate (sheet silicate) similar to biotite with the formula (K,Na,Ca) 0–1.4 (Fe 2...hardness 3.0–4.0; properties similar to those of biotite; found in metamorphosed iron- and manganese-rich sedimentary...
	Andesite Book article from: World of Earth Science ...minerals rich in iron and magnesium such as olivine , pyroxene, biotite, or hornblende are also present. Andesites are ordered in...bearing andesites, (2) pyroxene andesites, and (3) biotite and hornblende andesites. All are intermediate in composition...
	vermiculite Book article from: A Dictionary of Earth Sciences ...crystals flat and platy ; cleavage perfect basal {001}; occurs as an alteration product of biotite , from the hydrothermal alteration of biotite and phlogopite , and from the alteration of ultrabasic rocks ; expands greatly on heating. It...
	gneiss Book article from: A Dictionary of Earth Sciences ...is a result of the separation of dark minerals (e.g. biotite , hornblende , and pyroxenes ) and the light-coloured quartzofeldspathic...described more strictly by adding a qualifying prefix, e.g. biotite gneiss, hornblende gneiss, or pelitic gneiss.