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[?].

External Link

• Webmineral - Pyrochlore (http://webmineral.com/data/Pyrochlore.shtml)

See also: List of minerals