Pyrochlore
Pronunciation : Pyr"o*chlore
Part of Speech : n.
Etymology : [Pyro- + Gr. (Min.)
Definition : Defn: 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.
Source : Webster's Unabridged Dictionary, 1913