Pyrochlore

Pyrochlore (Na,Ca)2Nb2O6(OH,F) is a solid solution between the niobium end member (pyrochlore), and the tantalum end member (microlite). ==Occurrence== The mineral is associated with the metasomatic end stages of magmatic intrusions. Pyrochlore crystals are usually well formed (euhedral), occurring usually as octahedra of a yellowish or brownish c...
Found on http://en.wikipedia.org/wiki/Pyrochlore

Pyrochlore

• (n.) 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.
Found on http://thinkexist.com/dictionary/meaning/pyrochlore/

Pyrochlore

Pyr'o┬Ěchlore noun [ Pyro- + Greek ... 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.
Found on http://www.encyclo.co.uk/webster/P/204

pyrochlore

a complex oxide mineral [(Na, Ca)2Nb2O6(OH,F)] composed of niobium, sodium, and calcium that forms brown to black, glassy octahedral crystals and ... [1 related articles]
Found on http://www.britannica.com/eb/a-z/p/137
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