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wolframite

wolframite (wŏŏl´frəmīt´), reddish-brown to grayish-black lustrous mineral, a tungstate of iron and manganese, (Fe,Mn)Wo4, 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." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. 28 Apr. 2017 <http://www.encyclopedia.com>.

"wolframite." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (April 28, 2017). http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/wolframite

"wolframite." The Columbia Encyclopedia, 6th ed.. . Retrieved April 28, 2017 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/wolframite

wolframite

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." World Encyclopedia. . Encyclopedia.com. 28 Apr. 2017 <http://www.encyclopedia.com>.

"wolframite." World Encyclopedia. . Encyclopedia.com. (April 28, 2017). http://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/wolframite

"wolframite." World Encyclopedia. . Retrieved April 28, 2017 from Encyclopedia.com: http://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/wolframite