n. [ Pyro- + Gr. &unr_; 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. [ 1913 Webster ]
n. [ Pyro- + Gr. &unr_; 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. [ 1913 Webster ]
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