wolframite

[wool-fruh-mahyt, vawl-]
noun
a mineral, iron manganese tungstate, (Fe,Mn)WO 4 , occurring in heavy grayish-black to brownish-black tabular or bladed crystals: an important ore of tungsten.
Also, wolfram.


Origin:
1865–70; wolfram + -ite1

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To wolframite
Collins
World English Dictionary
wolframite (ˈwʊlfrəˌmaɪt)
 
n
a black to reddish-brown mineral consisting of tungstates of iron and manganese in monoclinic crystalline form: it occurs mainly in quartz veins and is the chief ore of tungsten. Formula: (Fe,Mn)WO4

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
Encyclopedia Britannica
Encyclopedia

wolframite

chief ore of tungsten, commonly associated with tin ore in and around granite. Such occurrences include Cornwall, Eng.; northwestern Spain and northern Portugal; eastern Germany; Myanmar (Burma); the Malay Peninsula; and Australia.

Learn more about wolframite with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
Cite This Source
Example sentences
Scheelite and wolframite are the principal minerals currently mined for tungsten.
Large imperfect crystals of wolframite embedded in quartz and chalcopyrite.
Two kinds of tungsten-bearing mineral rocks, called wolframite and scheelite, are mined commercially.
Quartz-wolframite, quartz-sulfide, and quartz-carbonate stages are identified.
Copyright © 2014 Dictionary.com, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature