Definitions
from The Century Dictionary.
- noun 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.
from the GNU version of the Collaborative International Dictionary of English.
- noun (Min.) 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 Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun mineralogy A
mineral whose composition is that of a mixedniobate mostly ofsodium ,calcium andcerium , (Na ,Ca )2Nb 2O 6(OH ,F ).
Etymologies
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Examples
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The pyrochlore recovery was 76. 5%, yielding a commercial grade of 51% Nb2O5 in the concentrate.
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According to Global Witness, some of the most important minerals found in the Kivu's are cassiterite, coltan, gold, pyrochlore and wolframite
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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. [
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