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
See also: List of minerals