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	wolframite - Encyclopedia.com
		Wolframite is a principle ore of tungsten and given...
		quartz gangue and is associated with wolframite and Fe-oxy-hydroxides as fibrous and...
		This main vein was mineralized with wolframite and scheelite and associated tin and...
	www.encyclopedia.com /doc/1E1-wolframi.html (966 words)

	SME--VIRTUAL ATLAS OF OPAQUE AND ORE MINERALS
		Euhedral cassiterite (medium grey, bottom right) with small inclusions of wolframite (higher reflectance, centre of cassiterite) is replaced by phyllosilicates (white mica) (bottom centre) and quartz.
		Tabular wolframite (light grey-brown and grey-blue) is zoned, the inner zone is blue and the outer zone is grey-brown.
		Wolframite (centre) is simply twinned and zoned with an inner zone which has altered to fine-grained poorly polished scheelite, enclosed within unaltered wolframite.
	www.smenet.org /opaque-ore/plate15.htm (390 words)

	[No title]
		The Mineral, Wolframite, is a principal ore of tungsten.
		Wolframite is commonly found in granite and pegmatite dikes, and is often associated with cassiterite; it also occurs in sulfide veins and placer deposits.
		Other important tungsten compounds are calcium and magnesium tungstates, which are used in fluorescent lighting, and tungsten disulfide, which is used as a high-temperature lubricant at temperatures up to 500 deg C. Tungsten compounds also find uses in the chemical, paint, and tanning industries.
	www.mine-engineer.com /mining/mineral/wolframite.htm (167 words)

	Wolframite - LoveToKnow 1911
		The colour of wolframite is generally dark brownish-fl, the lustre metallic or adamantine, the hardness 5 to 5.5, and the specific gravity 7.1 to 7.5.
		Wolframite may be regarded as an isomorphous mixture, in variable ratio, of iron and manganese tungstates, sometimes with a small proportion of niobic and tantalic acids.
		In consequence of the two minerals, cassiterite and wolframite, having nearly the same density, their separation becomes difficult by the ordinary processes of oredressing, but may be effected by means of magnetic separators, the wolf ramite being attracted by powerful magnets.
	www.1911encyclopedia.org /W/WO/WOLFRAMITE.htm (469 words)

	Playfair Mining Ltd. - Granite Lake Tungsten - Mon Apr 30, 2007
		Wolframite and molybdenite occur in sheeted quartz, quartz-greisen and quartz-pegmatite veins in a 25km2 area between Granite Lake and Meelpaeg Lake in south-central Newfoundland.
		Wolframite crystals and crystal-aggregates up to 3cm across are common A chip samples from the southern side of the hydro canal at the Rio prospect assayed 710 g/t W and 1110 g/t Mo over 5.0m.
		Wolframite occurrences and wolframite-bearing boulders are dominant to the east of the Meelpaeg Lake Fault zone in the tonalite and wolframite- and molybdenite-bearing boulders are found west of the Meelpaeg Lake Fault zone in the Wolf Mountain Granite.
	www.playfairmining.com /s/GraniteLakeTungsten.asp (1554 words)

	Wolframite - Biocrawler (Site not responding. Last check: )
		Wolframite (Fe,Mn)WO, is an iron manganese tungstate mineral that is the intermediate between ferberite (Fe rich) and huebernite (Mn rich).
		Wolframite is found in quartz veins and pegmatites associated with granitic intrusives.
		Before depleted uranium began to be used instead, wolframite was highly valued as the main source of the metal tungsten, a strong and high inertia material with wide uses, namely military.
	www.biocrawler.com /encyclopedia/Wolframite (196 words)

	Wolframite, rock, crystal, mineral, gem stone, birth stones - mineralgallery
		Before depleted uranium began to be used instead, wolframite was highly valued as the main source of the metal tungsten, a strong and high inertia material with many military uses.
		Wolframite (Fe,Mn)WO4, is an iron manganese tungstate mineral that is the intermediate between ferberite (Fe2+ rich) and huebernite (Mn2+ rich).
		Wolframite is found in quartz veins and pegmatites associated with granitic intrusives.
	www.mineralgallery.co.za /wolframite.htm (244 words)

	Tungsten - An Overview
		Wolframite is a general term for iron and manganese tungstates where the iron/manganese ratio can vary.
		Scheelite and/or wolframite is frequently located in rather narrow veins which are slightly inclined and often widen with the depth.
		Wolframite concentrates can also be smelted directly with charcoal or coke in an electric arc furnace to produce ferrotungsten (FeW) which is used as alloying material in steel production.
	www.azom.com /details.asp?ArticleID=1201 (1702 words)

	Process for recovering high purity tungsten compositions from wolframite ores - Patent 4092400
		The ground wolframite ore is generally contained in a slurry having a solids concentration of about 150 to 300 grams per liter, preferably 200 to 250 grams per liter.
		The wolframite concentrate was dry ground to 100% minus 100-mesh in a ball mill.
		Bamin concentrate, a high-arsenic wolframite ore, was doped with molybdenite to increase the molybdenum content, then pressure leached to determine the extent to which arsenic and molybdenum dissolved.
	www.freepatentsonline.com /4092400.html (6022 words)

	It's Elemental - The Element Tungsten
		The name Wolfram comes from the mineral wolframite, in which it was discovered.
		Wolframite means "the devourer of tin" since the mineral interferes with the smelting of tin.
		Tungsten was discovered by Juan José and Fausto Elhuyar, Spanish chemists and brothers, in 1783 in samples of the mineral wolframite ((Fe, Mn)WO Today, tungsten is primarily obtained from wolframite and scheelite (CaWO
	education.jlab.org /itselemental/ele074.html (343 words)

	Tungsten Wire History
		In 1783 the Spanish brothers, J. and F. d'Elhujar, published the results of their investigations on wolframite carried out with the Swede, T. Bergmann, while they were working in his laboratory.
		All these meanings are assumed to be associated with the early difficulties of extracting tin from cassiterite when it was contaminated with wolframite; the two minerals are frequently found together, and the wolfram was thought to eat the tin as a wolf eats sheep.
		For many years tungsten remained one of the rare elements, and it was not until 1847, when Oxland took out a patent for the manufacture of sodium tungstate, tungstic acid, and tungsten from cassiterite (tinstone), that the element became of any industrial importance.
	www.tungsten.com /tunghist.html (1805 words)

	Old Tungsten Mine Trumbell Connecticut
		The old tungsten mine in Trumbull is a locality well known to collectors, especially by reason of the fine large pseudomorphs of wolframite after scheelite which have at times been found there.
		The tungsten minerals are reported to have occurred along the lower contact of a thick bed of coarsely crystalline white marble which is interbedded with a deep green amphibolite schist.
		Tungsten minerals were not seen in the exposed portions of these veins but one might expect wolframite and scheelite in this association and these veins probably represent the same period of mineralization as the tungsten ores.
	www.minsocam.org /MSA/collectors_corner/arc/cntrumbell.htm (1042 words)

	Principal Metals-Tungsten
		Scheele, in 1781, found that a new acid could be made from tungsten (a name first applied about 1758 to a mineral now known as scheelite).
		The de Elhuyar brothers found acid in wolframite in 1783 that was identical to the acid of tungsten (tungstic acid) of Scheele, and in that year they succeeded in obtaining the element by reduction of this acid with charcoal.
		Tungsten occurs in wolframite, scheelite, huebnertie, and ferberite.
	www.principalmetals.com /utilities/74.htm (361 words)

	Amazon.com: wolframite (Site not responding. Last check: )
		Anomalous low-density wolframite and fluid inclusion control of density, evidence from fluid inclusion content of water and carbon dioxide (SuDoc I 19.76:89-679) by Gary P. Landis (Unknown Binding - 1990)
		Determination of calcium in wolframite concentrates by fluorescent x-ray spectrography (Report of investigations) by William Joseph Campbell (Unknown Binding - 1958)
		extraction of tungsten from Zinnwald wolframite, and in wiikite and bazz-...
	www.amazon.com /s?ie=UTF8&keywords=wolframite&tag=icongroupinterna&index=blended&link_code=qs&page=1 (753 words)

	Alan Guisewite's Mineral Collection Images: Miscellaneous Systematic Tungstates Page
		This ferberite cluster on muscovite is from the Yaogangxian Mine, Yizhang County, Hunan Province, China.
		The manganese-rich member of the wolframite series is hübnerite - this micro topped with quartz crystals is from the Black Pine Mine, Granite County, Montana.
		Wolframite is the midmember of the ferberite-hubnerite series and is often used generically for all three.
	www.cs.cmu.edu /~adg/adg-pstimages.html (1005 words)

	The Elements: Tungsten
		Tungsten (Swedish, tung sten, heavy stone); also known as WOLFRAM (from wolframite, said to be named from wolf rahm or spumi lupi, because the ore interfered with smelting of tin and was supposed to devour the tin), W; at.
		The de Elhuyar brothers found an acid in wolframite in 1783 that was identical to the acid of tung sten (tungstic acid) of Scheele, and in that year they succeeded in obtaining the element by reduction of this acid with charcoal.
		Tungsten occurs in wolframite, (Fe, Mn)WO4; scheelite, CaWO4; huebnerite, MnWO4; and ferberite, FeWO4.
	www.cmbi.kun.nl /~ott/elements/tungsten.html (443 words)

	WOLFRAMITE, or WOLFRAM - Online Information article about WOLFRAMITE, or WOLFRAM
		NEVADA (a Spanish word meaning " snow-clad " or " snowy land," originally applied to a snow-capped mountain range on the Pacific slope)
		Wolframite has in some cases resulted from the alteration of See also:
		Thus there is a manganous tungstate (MnWO4) known as hi bnerite, a name given by E.
	encyclopedia.jrank.org /WIL_YAK/WOLFRAMITE_or_WOLFRAM.html (645 words)

	Definition of wolframite - Merriam-Webster Online Dictionary
		Learn more about "wolframite" and related topics at Britannica.com
		Find more about "wolframite" instantly with Live Search
		See a map of "wolframite" in the Visual Thesaurus
	www.m-w.com /dictionary/wolframite (52 words)

	Tungsten \| World of Scientific Discovery
		In nature, tungsten is mainly found in the minerals scheelite and wolframite.
		Recognizing that this was the same acid that Scheele had produced just two years earlier, the d'Elhuyar brothers reduced the acid and discovered the new metal, tungsten.
		Because it was first obtained from wolframite, tungsten is also called wolfram.
	www.bookrags.com /research/tungsten-wsd (587 words)

	tungsten.htm
		A sample of Wolframite, the mineral Tungsten was first isolated from.
		Discovered how: the de Elhuyar brothers found an acid in wolframite in 1783 that they succeeded in reducing to the elemental metal with charcoal.
		wolframite in 1783 that was identical to the acid of tungsten (tungstic acid) of Scheele, and in that year they succeeded in obtaining the element by reduction of this acid with charcoal.
	www.sd61.bc.ca /school/colquitz/tungsten.htm (579 words)

	Wolframite Mineral Data
		Comments: Dark gray, tabular crystals of wolframite to 2 cm.
		Warning: this large pop-up is very compute intensive and may not work well with some computers.
		Escobar C, Cid-Dresdner H, Kittl P, Dumler I, American Mineralogist, 56 (1971) p.489-498, The relation between light wolframite and common wolframite, sample: light wolframite
	www.webmineral.com /data/Wolframite.shtml (220 words)

	Wolframite
		R9-01, Wolframite, 14 x 12 x 14 cm, $350
		Three Wolframite crystals, fl, no damage, up to 7.3 cm, grow into clear Quartz, associated with Mica.
		Does the Wolframite crystal look like being held by a hand?
	www.greatwallct.com /wolframi.htm (37 words)

	Mineral Information Institute - TUNGSTEN
		It has the highest melting temperature of any metal (3422 degrees C, 6192 degrees F), and the second highest of all elements (Carbon is highest).
		Tungsten was discovered in 1758 by Axel Fredrik Cronstadt; in 1781 Carl Wilhelm Scheele isoldated a tungsten oxide, and in 1783 the Spanish chemists (and brothers) Fausto and Juan Jose de Elhuyar first separated tungsten from the mineral wolframite.
		Tungsten is retrieved from the ore minerals scheelite (CaWO
	www.mii.org /Minerals/phototung.html (499 words)

	CRCPress Periodic Table Online: Cadmium
		Origin of name: Swedish, tung sten, heavy stone; also known as wolfram (from wolframite, said to be named from wolf rahm or spumi lupi, because the ore interfered with the smelting of tin and was supposed to devour the tin)
		In 1779 Peter Woulfe examined the mineral now known as wolframite and concluded it must contain a new substance.
		The de Elhuyar brothers found an acid in wolframite in 1783 that was identical to the acid of tungsten (tungstic acid) of Scheele, and in that year they succeeded in obtaining the element by reduction of this acid with charcoal.
	www.chemnetbase.com /periodic_table/elements/tungsten.htm (397 words)

	CRCPress Periodic Table Online: Cadmium
		Origin of name: Swedish, tung sten, heavy stone; also known as wolfram (from wolframite, said to be named from wolf rahm or spumi lupi, because the ore interfered with the smelting of tin and was supposed to devour the tin)
		Scheele, in 1781, found that a new acid could be made from tung sten (a name first applied about 1758 to a mineral now known as scheelite).
		The de Elhuyar brothers found an acid in wolframite in 1783 that was identical to the acid of tungsten (tungstic acid) of Scheele, and in that year they succeeded in obtaining the element by reduction of this acid with charcoal.
	chemnetbase.com /periodic_table/elements/tungsten.htm (397 words)

	74 Tungsten
		In 1779 Peter Woulfe (1727-1803/5) cooked wolframite in the acid of salt (HCl) and upon finding a rich yellow color suggested it might contained something new.
		The word wolfram, deriving from the German wolf’s rahm, is how wolframite was traditionally known by the saxon miners.
		Since the symbol of the element is W it is logical and self-explanatory that it derives from wolfram and not from tungsten.
	elements.vanderkrogt.net /elem/w.html (701 words)

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