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Topic: Bastnaesite

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	Recovery of neodymium/didymium values from bastnaesite ores - Patent 5338520
		In the case of bastnaesite, as described in Deco Trefoil, p.9, (November-December, 1967), a precalcination of the mineral may be employed, which makes it possible to solubilize only a part of the cerium with the mixture of the other rare earths during the subsequent recovery operation using hydrochloric acid.
		The leaching of bastnaesite with a solution of nitric acid enables the selective solubilization of the trivalent rare earths to the exclusion of the cerium values, the soluble traces of which are principally in tetravalent form.
		The first stage of the process of the invention entails calcining the bastnaesite at a temperature sufficiently high to transform the trivalent rare earths into a form capable of being solubilized in the subsequent nitric acid leaching step and converting the cerium into a form less soluble than the transformed trivalent rare earths.
	www.freepatentsonline.com /5338520.html (5638 words)

	Processes for reacting bastnaesite with metal oxides - Patent 5422332 (Site not responding. Last check: 2007-11-02)
		Bastnaesite materials and Mg[A] (and/or Al[B]) materials can be chemically reacted by use of reactions wherein a Al[B] ingredient such as alumina is made into a sol by use of a mono-protonic acid before Mg[A] (and/or Al[B]) materials is (are) reacted with the bastnaesite material.
		However, bastnaesite compositions have not been widely used as SO.sub.x additive materials because there are far better SO.sub.x catalyst materials (e.g., ceria, vanadia, etc.) and because bastnaesite is not a good long term absorbent because it is not easily regenerated under those conditions found in a fluid catalytic cracking unit or its catalyst regenerator unit.
		In effect, the heavier bastnaesite particles and the lighter spinel particles were "glued together" in the form of a composite particle which is held together by one or more catalyst binder material(s) in order that the resulting composite particles have a density better suited for fluidization.
	www.freepatentsonline.com:9003 /5422332.html (13959 words)

	B 2143 Part I
		Among these are pale-yellow monazite, yellow to brownish-yellow bastnaesite, pale- to dark-blue alkali amphibole, yellow phlogopite, pale-green to green aegirine and aegirine augite, colorless to lavender-purple to dark-purple fluorite, bluish-gray to gray hematite and martite, and dark-gray to fl magnetite.
		Bastnaesite from banded ore sample 796-48,280 (table 14), with an internal isochron age of 496+-13 Ma, is characterized by a high La content (28.64 wt.
		The internal isochron mineral ages of episodes of monazite and bastnaesite mineralization are shown in table 14 and figures 18-22, 32, and 33.
	pubs.usgs.gov /bul/b2143/part1.html (11966 words)

	Mountain Pass Rare Earth Mine
		The "ore" was identified as the rare earth fluorocarbonate bastnaesite.
		The ore consists of 60% carbonate (calcite, dolomite, siderite and ankerite), 20% sulfate (barite and celestite), 10% bastnaesite (rare earth fluorocarbonate) and 10% silicate phases (chiefly quartz).
		Bastnaesite is the principle ore mineral, but minor monazite and perhaps apatite are also recovered in the milling process.
	geology.csupomona.edu /drjessey/fieldtrips/mtp/mtnpass.htm (1406 words)

	Rhodia Electronics & Catalysis
		- Monazite, bastnaesite, xenotime and loparite, the primary ores, generally enriched by means of various physical processes (gravimetry, flotation, magnetic separation), are pulverized more or less finely into 50 mm to 1 mm grains, then chemically attacked by acid or basic reagents.
		A first process consists of precalcinating the bastnaesite in order to oxidize the cerium which is in an insoluble acid form.
		This process consists of attacking ground bastnaesite with concentrated sulfuric acid in a furnace at 300-400 °C. The rare earth sulfates obtained are then dissolved in water.
	www.rhodia-ec.com /site_ec_us/our_expertise/page_production.htm (564 words)

	[No title] (Site not responding. Last check: 2007-11-02)
		The adsorption of sodium oleate and potassium octyl-hydroxamate onto the rare-earths minerals monazite and bastnaesite was investigated through microflotation experiments, zeta potential determinations and infrared spectroscopy.
		The monazite and bastnaesite samples were purified in the laboratory reaching, respectively, final grades of 68.7 and 45.3% RE + ThO
		The results confirm that sodium oleate chemisorbs onto bastnaesite and suggest a physical adsorption mechanism of this reagent onto monazite.
	www.elsevier.com /cdweb/journals/08926875/articles/9/3/089268759600020.abstract.en (108 words)

	SIDEX - Explorer pour les lanthanides au Québec
		Lanthanides are sold as monazite or bastnaesite concentrates, or as mischmetal - a natural blend of rare earth elements (~53% Ce, 25% La, 16% Nd, 4% Pr and 2% others).
		Bastnaesite concentrates contain more REO but no thorium or yttrium.
		LREE in florencite, bastnaesite, monazite; HREE and yttrium as cation substitution in uraninite and coffinite; sulfides = chalcopyrite, pyrite, less commonly bornite and hypogene gold-bearing chalcosite; abundant iron oxides (hematite, magnetite); fluorite may be present
	www.sidex.ca /Vpub/ArtLan/lanthanides-english.htm (1993 words)

	Rare Earths
		Monazite sand, a by-product of heavy-mineral processing, is the most important mineral source of the rare-earth group.
		Deposits of the minerals bastnaesite and xenotime are also important sources of certain rare earths.
		The rare earths were once scientific curiosities, but modern methods of separation and new applications, particularly in the fields of atomic energy and metals research, make them commercially valuable.
	www.state.ar.us /agc/rare.htm (432 words)

	Bastnaesite, Bastnasite, Bastnäsite
		Prior to a couple of years ago, bastnaesite was something that was only found as crusts, or at some localities as small crystals, such as those from France and Germany.
		If you look closely, you can see what appears to be astrophyllite inclusions, typical of the bastnaesites form this area.
		I have never seen another group of bastnaesite crystals like it, from Trimouns, Pakistan, or anywhere else for that matter.
	www.khyberminerals.com /bastnaesite.htm (358 words)

	[No title] (Site not responding. Last check: 2007-11-02)
		Named after Bastnäs, a mine in South Central Sweden, Bastnaesite is a very rare and exotic mineral.
		Bastnaesite was first discovered in 1966 in the Mountains of Eastern Sayan, Russia.
		Bastnaesite is found as platy to coarse masses and crystals, and is a source of rare-earth elements, including Gadolinium, Samarium, and Neodymium.
	www.gemstv.com /buyersGuide/Bastnaesite.jsp (147 words)

	bastnaesite.html (Site not responding. Last check: 2007-11-02)
		It is also found in similar conditions at the Wimmer Pit #3 south of Rib Mountain.
		The bastnaesite forms earthy patches masses that are difficut to recognize.
		Bastnaesite also occurs at the Red Rock Granite North Pit (along Spring Brook road) and the Ladick Quarry (sec.
	www.uwrf.edu /~wc01/bastnaesite.htm (142 words)

	Search Results for bastnaesite - Encyclopædia Britannica (Site not responding. Last check: 2007-11-02)
		Though numerous minerals rich in rare earths are found in the Earth's crust, many are extremely rare, and many more are found only in small pockets in more massive rocks.
		Carbonatites are igneous rocks that consist largely of the carbonate minerals calcite and dolomite; they sometimes also contain the rare-earth ore minerals bastnaesite, parisite, and monazite, the...
		Neodymium is silvery-white colour and tarnishes in air to form an oxide which chips, exposing the metal to...
	www.britannica.com /search?query=bastnaesite&submit=Find&source=MWTEXT (205 words)

	Block Island Thorium!
		Monazite was reported to occur in granite exposed at the Redstone quarry near Westerly in the Ashaway quadrangle (Jaffe and others, 1959, p.
		At this locality the monazite is accompanied by bastnaesite and uranoan thorianite, but allanite is absent.
		The abundances of the accessory minerals in the granite at the Redstone quarry were estimated by Smith and Cisney (1956, p.
	www.dangerouslaboratories.org /rri.html (340 words)

	NMBGMR Bulletin 67 (Site not responding. Last check: 2007-11-02)
		Lincoln County has yielded a variety of metals and minerals: gold, coal, iron, lead, copper, zinc, fluorite, bastnaesite, gypsum, tungsten.
		Lesser districts, such as the Oscuro, Jicarilla, and Schelerville, have produced gold, copper, and other metals intermittently in the past.
		Mining was revived during WW II and later years to produce iron, fluorspar, and bastnaesite in previously known districts, but mining is now practically at a standstill.
	geoinfo.nmt.edu /publications/bulletins/67/home.html (385 words)

	bastnaesite - OneLook Dictionary Search
		Tip: Click on the first link on a line below to go directly to a page where "bastnaesite" is defined.
		bastnaesite : Encarta® World English Dictionary, North American Edition [home, info]
		bastnaesite : The American Heritage® Dictionary of the English Language [home, info]
	www.onelook.com /?w=bastnaesite (103 words)

	An assortment of Pakistani minerals from various locations (Site not responding. Last check: 2007-11-02)
		A complete hexagonal crystal of bastnaesite, 1 cm across, on matrix.
		This locality, and the bastnaesite from this mine are featured in the latest (May-June 2004) issue of the Mineralogical Record.
		A brilliant emerald green crystal of elbaite, with a sharp termination.
	www.khyberminerals.com /pakistaniminerals.htm (361 words)

	Bastnaesite, Gemstones, Colored Gems, Semi Precious Gems, Gem Cutting, Faceting (Site not responding. Last check: 2007-11-02)
		Bastnaesite, Gemstones, Colored Gems, Semi Precious Gems, Gem Cutting, Faceting
		Bastnaesite, brown, 0.84ct., trillion, VSI, ~5 mm, Pakistan.
		All scanned photographs shown here are for your viewing enjoyment only.
	www.buenavistagemworks.com /gemstones/gempages/bastnaesite.htm (297 words)

	Bastnaesite Gem Rough
		This faceting rough is very hard to get, and is only going to get harder to find in the months and years ahead.
		I have recently seen one carat slightly included bastnaesite cut stones selling for $500+ct. This price will most likely go even higher in the near future as the mines are starting to become depleted of Bastnaesite and are expected to be exhausted in the very near future if not already.
		This rare Bastnaesite facet rough is being sold by the single stone.
	www.gemstonesandrough.com /html/bastnaesite_gem_rough.html (206 words)

	B 2143 Part III
		REE's evidently were the first ore elements introduced, at about 555 Ma, along with P and F. The solutions containing these elements had random spatial and time distribution and produced disseminated ores containing monazite or bastnaesite or mixtures of these two major REE minerals.
		During the peak periods of ore formation, REE's, Fe, P (to form monazite and apatite), Na, Si (to form aegirine augite), F (to form bastnaesite and fluorite), and Ba (to form barite) were brought in by different hydrothermal solutions in order to produce the wide variety of banded ores.
		Na, K, and Si (to form alkali amphiboles) were also introduced during the peak and waning phases of REE mineralization, but deposited in different parts of the orebodies than the above assemblage.
	pubs.usgs.gov /bul/b2143/part3.html (2372 words)

	Carbonatites in Southern Malawi (Bulletin No. 15) (Site not responding. Last check: 2007-11-02)
		The carbonatites are believed to have developed n continental shield areas where rifting provided access to highly differentiated fractions of these parental ultrabasic magmas.
		Minerals and rocks of economic interest at the carbonatitic centres comprise apatite, baryte, bastnaesite, florencite, fluorite, magnetite, manganese oxides, monazite, pyrochlore, sphalerite, strontianite, limestone and nepheline-syenite.
		Of these the most important are apatite and bastnaesite at the Tundulu Complex, monazie and strontianite at the Kangankunde Complex, and pyrochloe at the Chilwa Island Complex.
	www.sadc-fanr.org.zw /rrsu/clrnghse/malawi/CarbonatitesMalawi.htm (451 words)

	Documento senza titolo
		THIS PAGE IS DEDICATE TO good sample showing a rombic, fresh crystal on chlorite and red, exagonal, tabular bastnaesite crystals
		05 - HINGGANITE - a large crystal on red orthoclase with a lot of bastnaesite crystals
		09 - HINGGANITE - goor prismatic, rombic crystal with chlorite and bastnaesite
	www.mineralservice.com /eng/shop/cuasso_al_monte.htm (141 words)

	[No title] (Site not responding. Last check: 2007-11-02)
		Process for separation of bastnaesite from weathered bastnaesite barite fluorite ores
		A method for beneficiation of bastnaesite ore, comprising:
		selectively floating and removing, bastnaesite from the fluorite tailing slurry which results in a bastnaesite float concentrate.
	www.uspto.gov /web/patents/patog/week14/OG/html/1293-1/US06874640-20050405.html (150 words)

	Douglas W. Fuerstenau
		"The Role of Inorganic and Organic Additives in Bastnaesite Ore Flotation," (with Pradip), in FLOTATION HEUTE, Industrielle Anwendung und neuere Entwicklungen, GDMB, Clausthal-Zellerfeld, Heft 48, pp.
		"Alkyl Hydroxamates as Collectors for the Flotation of Bastnaesite Rare-Earth Ores," (with Pradip), in Rare Earths, Extraction, Preparation and Applications, R. Bautista and M. Wong, Ed., The Minerals, Metals and Materials Society, Warrendale, Pa., pp.
		"The Surface Chemistry of Bastnaesite, Barite and Calcite in Aqueous Carbonate Solutions," (with Pradip and R. Herrera-Urbina), Colloids and Surfaces, Vol.
	www.mse.berkeley.edu /faculty/Fuerstenau/Fuerstenaubio.html (9692 words)

	Bastnaesite--Adamsminerals.com--Your online mineral specimen resource --Minerals A-E (Site not responding. Last check: 2007-11-02)
		BAS-12 Bastnaesite Ce--NM--Nice 3cm+ specimens with yellow needles in fluorite.
		Please feel free to click our tabs above to browse minerals by name.
		For more up to date localities email me at adam@nospamadamsminerals.com.
	www.adamsminerals.com /bastnaesite.htm (33 words)

	Definition of bastnaesite - Merriam-Webster Online Dictionary
		Click here to search for another word in the Merriam-Webster Online Dictionary.
		For More Information on "bastnaesite " go to Britannica.com
		Get the Top 10 Search Results for "bastnaesite "
	www.m-w.com /cgi-bin/dictionary?book=Dictionary&va=bastnaesite (85 words)

	The Good Samarium (Site not responding. Last check: 2007-11-02)
		Samarium is a lanthanoid and the hardest member of the cerium group of rare earth metals.
		Its main commercial sources are the minerals monazite and bastnaesite, although it also exists in other ores such as the samarskite from which it takes its name.
		The full form of samarium's electron configuration is
	www.chemistry.pomona.edu /Chemistry/periodic_table/Elements/Samarium/samarium.htm (243 words)

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