from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A mineral whose composition is that of a mixed niobate mostly of sodium, calcium and cerium, (Na,Ca)2Nb2O6(OH,F).
from the GNU version of the Collaborative International Dictionary of English
- n. A niobate of calcium, cerium, and other bases, occurring usually in octahedrons of a yellowish or brownish color and resinous luster; -- so called from its becoming grass-green on being subjected to heat under the blowpipe.
from The Century Dictionary and Cyclopedia
- n. A niobotitanate of calcium, cerium, and other bases, occurring in isometric crystals, commonly octahedrons, of a brownish color and resinous luster. It turns yellowish-green under the blowpipe, whence the name.
Sorry, no etymologies found.
The pyrochlore recovery was 76. 5%, yielding a commercial grade of 51% Nb2O5 in the concentrate.
According to Global Witness, some of the most important minerals found in the Kivu's are cassiterite, coltan, gold, pyrochlore and wolframite
PWC is also a shareholder involved in the niobium / tantalum (pyrochlore) mine at Lueshe, North Kivu, at the heart of the Rwandan "Tutsi rebel" occupation in eastern Congo. [