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Topic: Riebeckite

	riebeckite.html (Site not responding. Last check: 2007-11-05)
		Description: Riebeckite is a sodium-rich member of the amphibole family.
		JACKSON COUNTY: Minor riebeckite occurs in the iron formation and along later joints at the Jackson County Iron Mine, SE sec.
		MARATHON COUNTY: Riebeckite is relatively common in the syenites of the Stettin Pluton, west of Wausau.
	www.uwrf.edu /~wc01/Riebeckite.htm (177 words)

	Riebeckite - Wikipedia, the free encyclopedia
		Riebeckite is a sodium-rich member of the amphibole group of minerals, chemical formula Na (Fe,Mg)
		Some forms of riebeckite are asbestiform, notably crocidolite, also known as blue asbestos.
		The riebeckite found on the island of Ailsa Craig, known as Ailsite, is prized for its use in making curling stones.
	en.wikipedia.org /wiki/Riebeckite (165 words)

	Mineralogy and Petrology of the Contact Metamorphosed Amphibole Asbestos-bearing Penge Iron Formation, Eastern ...
		Riebeckite coexists with ferri-annite (Si/Al>3), quartz, grunerite, magnetite, carbonates and kerogen (Figs 3 and 6).
		However, the upper stability limit of riebeckite in the presence of quartz at the HM (haematite-magnetite) buffer [reaction (19), Table 7] is the same as that of the experimental data of Ernst, (1962) (Fig.
		This reef is composed of riebeckite at Mafefe and of amosite at Penge (Fig.
	www.oxfordjournals.org /our_journals/petroj/online/Volume_38/Issue_05/html/ega032_gml.html (9524 words)

	Riebeckite
		This is a specimen of riebeckite, an asbestiform mineral.
		Riebeckite asbestos comprises only a small amount of the total asbestos ever mined; most of it was serpentine.
		Riebeckite was considered desirable because of its superior resistance to chemical attack.
	www.museums.udel.edu /mineral/mineral_site/displaycollection/Silicates/Inosilicates/9999-0803-0062.html (86 words)

	RIEBECKITE (Sodium Iron Magnesium Silicate Hydroxide)
		Riebeckite is an important mineral for two main reasons: one for when it is there and one for when it isn't.
		The pseudomorphing of riebeckite's asbestos fibers does two things; it preserves the beauty of the fibers and their lustrous light effects and it produces a much more durable stone that is now, thanks to the silicification, suitable for carving and jewelry.
		Riebeckite is the ferrous iron rich member of the series and as the name implies, magnesioriebeckite is the magnesium rich member.
	mineral.galleries.com /minerals/silicate/riebecki/riebecki.htm (852 words)

	Riebeckite \| Natural Pigments (Site not responding. Last check: 2007-11-05)
		Riebeckite is a not well-known dark blue mineral although most people have probably seen stones that at one time were composed of riebeckite crystals.
		Riebeckite is a natural silicate mineral belonging to the amphibole group with notable occurrences in Soqotra, South Yemen; Transvaal, South Africa; Schirmeck, Germany; Langesund, Norway; Krivoi Rog, Ukraine; Western Australia; Scotland; Madagascar; and the USA.
		Riebeckite is an asbestiform mineral and is rated toxic, especially with prolonged exposure by inhalation.
	www.naturalpigments.com /detail.asp?PRODUCT_ID=410-30S (289 words)

	Riebeckite Information
		Riebeckite is a sodium-rich member of the amphibole group of minerals, chemical formula Na (Fe,Mg)
		Some forms of riebeckite are asbestiform, notably crocidolite, also known as blue asbestos.
		The riebeckite found on the island of Ailsa Craig, known as Ailsite, is prized for its use in making curling stones.
	www.bookrags.com /wiki/Riebeckite (125 words)

	Output_15 (Site not responding. Last check: 2007-11-05)
		Riebeckite thermodynamic data are now fitted to experiments of Ernst (1962) for the reaction rieb + 3hem = 2acm + 3mt + 4q + H2O.
		No experiments are available for this reaction, but it has occurred in the Eastern Alps at around 9 kbar and 450°C (Holland and Ray, 1985) in an assemblage with pure albite, hematite, paragonite and a sodic pyroxene of composition jadeite{44}acmite{56}.
		Thus data for both acmite and riebeckite must be regarded as provisional.
	www.ccp14.ac.uk /ccp/web-mirrors/crush/astaff/holland/ds5/HP98_Output/Output15.html (241 words)

	[No title]
		Aegirine, amphibole grp., apatite grp., arfvedsonite, astrophyllite, bastnaesite, biotite, elpidite, fluorite, magnetite, microcline, okanoganite, poylylithionite, quartz, riebeckite, zektzerite, zircon.
		Aegirine, aegirine-augite, albite, andradite, apatite grp., biotite, calcite, diopside, dolomite, feldspar grp., hydrobiotite, magnetite, microcline, muscovite, nepheline, phlogopite, pyrite, quartz, riebeckite, titanite, vermiculite.
		Aegirine, aenigmatite, amphibole grp., apatite grp., astrophyllite, fayalite, hornblende, magnetite, pyroxene grp., quartz, riebeckite, titanite, zircon.
	www.koeln.netsurf.de /~w.steffens/usa.htm (1991 words)

	[No title] (Site not responding. Last check: 2007-11-05)
		Quincy granite is a riebeckite-aegirite granite, riebeckite and aegirite being varieties of hornblende and augite, respect ively.
		The bluish tint of the feldspars is due to microscopic crystals of riebeckite.
		The contrast of shade is chiefly between the fl silicates and the combined quartz and feldspar, except where the feld spar is whitened by kaolinization, which causes it to stand out from the quartz.
	ci.quincy.ma.us /tcpl/legacy/history/hisch5.htm (5465 words)

	BrazilianGallery 2
		These are extremely rare and two light sources are used to show the colors.
		2 1/2" X 1 3/4"It has been discovered that the rare variety of tourmaline - olenite is one of the inclusions with riebeckite.
		It has been discovered that the rare variety of tourmaline - olenite is one of the inclusions with riebeckite.
	www.wrightsrockshop.com /gallery/Brazilgallery/brazilian_gallery.htm (431 words)

	[No title]
		Aegirine, aegirine-augite, amphibole grp., analcime, augite, biotite, calcite, feldspar grp., hornblende, nepheline, olivine, perthite, quartz, riebeckite.
		Aegirine, apatite grp., biotite, fluorite, microcline, quartz, riebeckite, titanite, zircon.
		Ankerite, barite, bastnaesite, cerianite, collophane, dahllite, dolomite, franconite, goethite, meta-autunite, monazite, quartz, riebeckite.
	www.koeln.netsurf.de /~w.steffens/latam.htm (660 words)

	Sodic Amphibole
		The most important members of this group are glaucophane, crossite and riebeckite.
		Riebeckite contains little Mg; it is essentially an Na-Fe amphibole.
		Blue amphiboles are generally identified by mineral association, and distinctive color and pleochroism.
	www.und.nodak.edu /instruct/mineral/320petrology/opticalmin/naamph.htm (382 words)

	Bates Geology: John Creasy - White Mountains
		Further, tufts of acicular needles of riebeckite grown on a s ubstrate of ferrorichterite project into grains of quartz.
		The Mt. Osceola Granite, the quartz syenite of Mt. Tremont, and the riebeckite granite, respectively, were derived from the same or similar magmas that had undergone increasingly greater degrees of CryStal fractionation.
		The comendites are blue-gray to pink rocks contain variably abundant phenocrysts (1-3 mm) of quartz and microperthite and rare phenocrysts of biotite, ferrohastingsite, ferrohedenbergite, and riebeckite set in a matrix of quartz and alkali feldspar.
	abacus.bates.edu /acad/depts/geology/jcreasy.WM.html (3962 words)

	Inosilcates
		Members of this series can be distinguished from orthorhombic Anthophyllite by the inclined extinction of the monoclinic Cummingtonite-Grunerite series, and can be distinguished from tremolite and actinolite by the higher refractive indices and higher birefringence of the Cummingtonite Grunerite series.
		Glaucophane - Riebeckite - Glaucophane is a common mineral in blueschist facies metamorphic rocks that result from low temperature, high pressure metamorphism along ancient subduction zones.
		Riebeckite is found in alkali granites, syenites, and peralkaline rhyolites.
	www.tulane.edu /~sanelson/eens212/amphiboles&micas.htm (2110 words)

	PHASE RELATIONS OF RIEBECKITE-ARFVEDSONITE SOLID SOLUTIONS (Site not responding. Last check: 2007-11-05)
		Terminal breakdown reactions of riebeckite on the HM and FMQ buffers are O
		Reaction 2 for pure riebeckite is metastable with respect to riebeckite-arfvedsonite solid solution, as shown experimentally by Ernst (1962) and Owen (1988).
		This is why the sodic amphibole in sodic granites is arfvedsonitic rather than riebeckitic.
	gsa.confex.com /gsa/2002AM/finalprogram/abstract_40641.htm (444 words)

	Riebeckite Information Center - Riebeckite
		Cleavage is perfect, two directions in the shape of a diamond; fracture is uneven, splintery.
		It typically Riebeckite forms dark-blue elongated to fibrous crystals in highly sodic granites, syenites, iron formations and schists.
		This article about a specific mineral, mineraloid, or type of rock is a stub.
	www.scipeeps.com /Sci-Chemistry_Topics_Pr_-_R/Riebeckite.html (114 words)

	Micro Analytical Laboratories, Inc.
		Riebeckite is the name used for minerals of the glaucophane-crossite-riebeckite series in which iron is predominant over magnesium and aluminum.
		Crocidolite is called the "Blue Asbestos", because it is strongly pleochroic, ranging from Prussian blue and indigo blue to yellow green.
		Riebeckite cleavage fragments may be found in association with true asbestiform bundles.
	www.labmicro.com /crocidolite.htm (225 words)

	Body
		Riebeckite albitite formed in the rear zone of the experimental column, whereas quartz was removed, K-feldspar and plagioclase were completely albitized, and alkaline amphibole replaced biotite.
		The front zone of the column corresponded in composition to riebeckite granite.
		Many minerals of the granite metasomatites (quartz, feldspar, muscovite, albite, topaz, tourmaline, epidote, riebeckite, aegirine, etc.) are formed within a wide P-T interval and are not indicative of pressure and temperature, although they are informative on composition of the solutions.
	www.iem.ac.ru /staff/zarp1.html (5715 words)

	[No title]
		The blue amphiboles Glaucophane--NaMgAl silicate (OH) Riebeckite--NaFe silicate (OH) bluish color and prismatic, frequently fibrous habit, are diagnostic Crocidolite is the asbestiform variety of riebeckite; environmental health concerns have severely limited production; silicified crocidolite is known as "tiger eye".
		The main occurrence of glaucophane is in blueschists which have undergone high pressure, low temperature regional metamorphism where a cool subducted slab has depressed isotherms to great depths.
		Riebeckite is most commonly associated with iron formation.
	cmsu2.cmsu.edu /public/classes/Dudley/Mineralogy/Silicates/Inosilicates.doc (544 words)

	Summary of Citation (Site not responding. Last check: 2007-11-05)
		Riebeckite makes up about one-fifth of the rock.
		Alkalic riebeckite granite in small bodies intrusive into Pikes Peak Granite and other rocks of composite Pikes Peak batholith.
		Is a blue-gray, fine- to coarse-grained riebeckite granite in southern part of the Pikes Peak batholith, CO in Southern Rocky Mountain region.
	ngmdb.usgs.gov /Geolex/Refsmry/sumry_9426.html (342 words)

	LookSmart - Directory - Guides to Riebeckite (Site not responding. Last check: 2007-11-05)
		Look at an image of riebeckite, the associated minerals, occurrence details, optical properties, crystal habits, and the origin of the name.
		Collection of facts about riebeckite is presented, including the local occurrence frequency, origin of the mineral name, and its physical attributes.
		Browse a profile of riebeckite that includes its crystal system, chemical formula, color, density, and the type and location of the mineral occurrence.
	www.calbearssearch.com /p/browse/us1/us317914/us263953/us330812/us553452/us10180861/us10181552/us10181571 (243 words)

	Syenites From the Cuddapah Basin
		The alkali syenites (found at Racherla, Idamakallu and Giddalur) are mainly composed of riebeckite (arfvedsonite), ilmenite, orthoclase and the subalkaline syenites (located at Gundlapalle) comprise hedenbergite, and microcline-perthite.
		In contrast to the leucocratic and sub-alkaline syenite of Gundlapalle, the RIG syenites are mesocratic and unequivocally alkaline.
		The abundance of alkali amphibole, riebeckite- arfvedsonite, in these rocks demonstrates that the magma was hydrous and alkaline, as against the anhydrous and subalkaline character of the Gundlapalle syenite magma.
	www.ausafsayeed.com /research.html (4284 words)

	Riebeckite
		Riebeckite is better known as crocidolite and has psuedomorphed into the well known tigers eye.
		Guides to Riebeckite - Browse resources regarding the chemical and physical attributes of this mineral.
		The field examination and preliminary laboratory study of radioactive albite-riebeckite--granite from four Nigerian localities are presented.
	www.toprocks.net /MineralList/78/Riebeckite.asp (336 words)

	[No title]
		- (Si : Riebeckite occurs in primary igneous rocks of acidic and intermediate composition.
		This comparison eliminated riebeckite, magnesioriebeckite, glaucophane, and eckermannite, or their solid solutions as possibilities.
		The plagioclase, chlorite, and mica components of the pattern are too weak for the determination of compostion or structure type.
	speclab.cr.usgs.gov /spectral.lib04/DESCRIPT/riebeckite.HS326.html (305 words)

	Amazon.com: riebeckite (Site not responding. Last check: 2007-11-05)
		A - Na, Mg, AI Riebeckite A = Na, Fe Magnesioriebeckite...
		3.48 6 1.725 1.729 1.737 Riebeckite Na2Fe5(Si8022)(OH)2 monocl 3.3 5 1.675...
		of the five amphiboles: crocidolite (riebeckite), amosite (cummingtonite- grunerite), anthophyllite, tremolite,...
	www.amazon.com /s?ie=UTF8&keywords=riebeckite&index=blended&page=1 (910 words)

	Conditions of riebeckite formation in the iron-formation of the Dales Gorge Member, Hamersley Group, Western Australia ...
		Conditions of riebeckite formation in the iron-formation of the Dales Gorge Member, Hamersley Group, Western Australia -- Miyano and Klein 68 (56): 517 -- American Mineralogist
		Where riebeckite coexists with carbonates, its stability field is enlarged by a decrease of total carbonate at constant pH.
		Riebeckite assemblages in the Dales Gorge Member can be divided into two groups, carbonate-free and carbonate-bearing.--Modified journal abstract.
	ammin.geoscienceworld.org /cgi/content/abstract/68/5-6/517 (174 words)

	GemRocks: Hawk's Eye & Tiger's Eye
		This approach seems warranted because both are formed by the replacement of crocidolite (asbestiform riebeckite) by silica (quartz).
		crystallization of the amphibole, initially in the form of massive riebeckite, occurred with little or no addition of material and under conditions of moderate temperature and pressure consequent on the burial of the ironstones to moderate depths.
		Whatever the correct origin(s?), at least in South Africa, where the gemrock material comprises relatively thick slabs, tiger's-eye appears to have been formed from hawk's-eye as the result of the breakdown -- chiefly oxidation -- of crocidolite, with preservation of the original fibrous nature of the overall mass.
	www.cst.cmich.edu /users/dietr1rv/hawkseye.htm (2361 words)

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