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pyrochlore
CIDE DICTIONARY
pyrochlore, n. [Pyro- + Gr. pale green.].
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. [1913 Webster]
For further exploring for "pyrochlore" in Webster Dictionary Online