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 | © 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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wolframite

A Dictionary of Earth Sciences | 1999 | | © 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. 10 Feb. 2010 <http://www.encyclopedia.com>.

AILSA ALLABY and MICHAEL ALLABY. "wolframite." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (February 10, 2010). http://www.encyclopedia.com/doc/1O13-wolframite.html

AILSA ALLABY and MICHAEL ALLABY. "wolframite." A Dictionary of Earth Sciences. 1999. Retrieved February 10, 2010 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-wolframite.html

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Free newspaper and magazine articles

	Ferberite.(tungstate) Magazine article from: Rocks & Minerals; 7/1/1998
	Memories of China.(Letter to the Editor) Magazine article from: Rocks & Minerals; 5/1/2005
	Reportlinker Adds Global Tungsten Market Analysis. Business Wire; 3/12/2009

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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...
	Queensland Ores to focus on wolframite deposit. News Wire article from: Australasian Business Intelligence; 5/23/2005; 406 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...
	Price difference shrinks between tungsten ores. Magazine article from: American Metal Market; 4/5/1985; ; 700+ words ; ...YORK--The price differential between wolframite and scheelite tungsten ores, which...standard price quotations for scheelite and wolframite, and a proposal to issue separate tungsten...Administration stockpile material. Currently wolframite and scheelite are selling for about...
	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...
	Weak mart causes indefinite shutdown of UC tungsten mine. (Union Carbide) Magazine article from: American Metal Market; 4/3/1985; ; 700+ words ; ...to operate profitably. Currently, wolframite ore is selling for about $75 per ton...At the same time, an overhand in wolframite stocks coupled with an influx of low...ammonium paratungstate were depressing wolframite prices. Calcium-containing scheelite...
	Billiton closing tungsten mine in New Brunswick. (Billiton Canada Ltd.) Magazine article from: American Metal Market; 6/6/1985; ; 700+ words ; ...decision was seen by market observers as a response to an oversupply situation in wolframite and to the bottoming out this month of wolframite prices. Wolframite ore prices hit their lowest level Monday in terms of actual dollars since 1974...
	Tungsten output is still slipping in west. (Tungsten) Magazine article from: American Metal Market; 8/26/1991; ; 700+ words ; ...1990, the Metal Bulletin quotation for wolframite was $37-$53 per metric ton unit...were $56-$60 and $52-$71. The wolframite quotation, which reached a level last...up $7 in one month. Although the wolframite market was quiet at the beginning of...
	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...
	GSA studies split offers for tungsten. (General Services Administration) Magazine article from: American Metal Market; 12/28/1984; ; 700+ words ; ...separating offerings of scheelite and wolframite for the first time. Under the proposal...of tungsten ore would be made, with wolframite tenders opened on the second Tuesday...standard price quotations for scheelite and wolframite. These published price quotes for the...
	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...