from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Any of several red-brown to black minerals with the general formula (Fe,Mn)WO4, which constitute a major source of tungsten.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A mineral that consists of a tungstate of iron and manganese; (Fe,Mn)WO4.
from the GNU version of the Collaborative International Dictionary of English
- n. Tungstate of iron and manganese, generally of a brownish or grayish black color, submetallic luster, and high specific gravity. It occurs in cleavable masses, and also crystallized. Called also wolfram.
from The Century Dictionary and Cyclopedia
- n. See wolfram.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a mineral consisting of iron and manganese tungstate in crystalline form; the principal ore of tungsten; found in quartz veins associated with granitic rocks
From German Wolframit, from Wolfram, tungsten (Wiktionary)