Pyr″o‐chlore (?), n. [Pyro- + Gr. � pale green.] (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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.