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Pyrochlore

Pyrochlore (Na,Ca)₂Nb₂O₆(OH,F) is 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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Webmineral - Pyrochlore (http://webmineral.com/data/Pyrochlore.shtml)

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