from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A yellow or yellowish-green mineral, essentially WO3, often occurring with tungsten ores.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An orthorhombic hydrous tungsten oxide mineral formed by the weathering of other tungsten-containing minerals.
from the GNU version of the Collaborative International Dictionary of English
- n. The oxide of tungsten, a yellow mineral occurring in a pulverulent form. It is often associated with wolfram.
from The Century Dictionary and Cyclopedia
- n. Native oxid of tungsten, occurring in pulverulent form, of a bright-yellow color, usually in connection with wolfram, the tungstate of iron and manganese. Also called tungstic ocher.
In some tungsten deposits a hydrated oxide called tungstite has been formed as a canary-yellow coating at the surface.