wolframite

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wolframite

wolframite , reddish-brown to grayish-black lustrous mineral, a tungstate of iron and manganese, (Fe,Mn)Wo ₄ , occurring in crystals of the monoclinic system. It is the chief ore of the metal tungsten. Widely distributed in nature, it is mined in England, Portugal, Bolivia, Myanmar and the Malay Peninsula, S China, Australia, and W United States.

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wolframite

World Encyclopedia | 2005 | Â© World Encyclopedia 2005, originally published by Oxford University Press 2005. (Hide copyright information) Copyright

wolframite (iron-manganese tungstate) Black to brown mineral, (Fe,Mn)WO₄. It is the chief ore of the metal tungsten. It occurs as crystals in the monoclinic system or as granular masses. It is found in quartz veins and pegmatites associated with granitic rocks and also in hydrothermal veins. Hardness 5–5.5; r.d. 7–7.5.

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

wolframite Ore mineral for tungsten, with the formula (Fe,Mn)WO₄; sp. gr. 7.0–7.5; hardness 5.0–5.5; monoclinic; grey-black to brownish-black; brownish black streak; metallic lustre; crystals normally tabular, prismatic, often bladed, also occurs granular and massive; cleavage perfect {010}; occurs in high-temperature hydrothermal veins, quartz veins, and pegmatites, associated with granitic rocks, with cassiterite, arsenopyrite, tourmaline, scheelite, galena, sphalerite, and quartz.

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AILSA ALLABY and MICHAEL ALLABY. "wolframite." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 11 Nov. 2009 <http://www.encyclopedia.com>.

AILSA ALLABY and MICHAEL ALLABY. "wolframite." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (November 11, 2009). http://www.encyclopedia.com/doc/1O13-wolframite.html

AILSA ALLABY and MICHAEL ALLABY. "wolframite." A Dictionary of Earth Sciences. 1999. Retrieved November 11, 2009 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-wolframite.html

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Free newspaper and magazine articles

	Reportlinker Adds Global Tungsten Market Analysis. Business Wire; 3/12/2009
	Examine the World Tungsten Market. Business Wire; 1/6/2009
	Noront Updates its Double Eagle Project, McFaulds Lake Area Northeastern Ontario; its Burnthill Tungsten Deposit New Brunswick and Inner Mongolian Copper/Gold Project, China. Business Wire; 1/14/2005

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	Chinese ferroalloys.(wolframite reserves disappearing in China)(Brief Article) Magazine article from: Mining Journal; 12/1/2000; 667 words ; Chinese reserves of wolframite, once the main source of tungsten...ferroalloys conference in Paris, said that wolframite now represents only 27% of Chinese...the industry has just 12 years of wolframite supply left at current output rates...
	Four companies bid for wolframite deposit in Kyrgyzstan. Newspaper article from: Russia & CIS Business and Financial Newswire; 11/13/2006; 395 words ; Four companies bid for wolframite deposit in Kyrgyzstan BISHKEK. Nov 13 (Interfax) - Four companies will compete in a tender for the right to develop the Kensu wolframite deposit in Kyrgyzstan, senior official of the Kyrgyz State Agency...
	Queensland Ores to focus on wolframite deposit. News Wire article from: Australasian Business Intelligence; 5/23/2005; 410 words ; ...Ores cover defined copper and gold resources at two sites, plus an exploration permit with an application encompassing ex- wolframite, molybdenite and tin workings. The deputy chairman of MacArthur Coal, Roger Marshall, agreed in April 2005 to chair the...
	Modern Hydrometallurgical Production Methods for Tungsten Magazine article from: JOM; 9/1/2006; ; 700+ words ; ...sufficient abundance to be of economic significance can be divided into the wolframite and scheelite groups. The wolframite group consists of three minerals: ferberite, wolframite, and huebnerite. The iron-rich tungstate (FeWO^sub 4^, WO...
	The San Cristobal district Magazine article from: Mineralogical Record; 7/1/1997; ; 700+ words ; ...chalcopyrite, tetrahedrite-tennantite, wolframite (hubnerite), calcite, siderite...The sequence of deposition is pyrite, wolframite, quartz, chalcopyrite, sphalerite...tungsten stage, consisting of pyrite, wolframite and quartz with trace amounts of sericite...
	Lomonosov Moscow State University reports research in geochemistry. Newspaper article from: Chemicals & Chemistry; 11/21/2008; 700+ words ; ...research from Russia, The Akchatau wolframite deposit in central Kazakhstan is a typical...temperature decrease. The precipitation of wolframite in near-vein greisens is related to...host granites. Boiling does not affect wolframite precipitation but increases the content...
	First Narrows Announces Grab Sample Results From Falls Creek Property Results confirm significant values of tungsten and molybdenum. M2 Presswire; 9/29/2006; 700+ words ; ...associated quartz veins with visible wolframite and molybdenite. Analyses of samples...689199 5178670 Fine to medium grained Wolframite and minor Molybdenite crystals in greisen...greisen with fine to medium grained Wolframite crystals and no visible Molybdenite...
	Reportlinker Adds Global Tungsten Market Analysis. Newspaper article from: Biotech Week; 3/25/2009; 700+ words ; ...7 Properties of Tungsten II-7 Wolframite and Scheelite II-8 Tungstate II...Regions-China, Russia (Scheelite and Wolframite), Canada, Austria, Bolivia, Portugal (Scheelite and Wolframite), Dem P.R. of Korea, Thailand...
	Examine the World Tungsten Market. Business Wire; 1/6/2009; 700+ words ; ...7 Properties of Tungsten II-7 Wolframite and Scheelite II-8 Tungstate II...Regions-China, Russia (Scheelite and Wolframite), Canada, Austria, Bolivia, Portugal (Scheelite and Wolframite), Dem P.R. of Korea, Thailand...
	Study findings from University of Valencia provide new insights into physics. Newspaper article from: Physics Week; 11/11/2008; 666 words ; ...active phonons of the low-pressure wolframite phase. As pressure increases additional...the observed Raman modes in both the wolframite and beta-fergusonite phases. Based...parameters and the atomic positions of wolframite ZnWO4 are also theoretically calculated...