pyrochlore

[pahy-ruh-klawr, -klohr]
noun
a mineral, chiefly composed of niobates of the cerium metals, occurring in syenites in the form of brown crystals.

Origin:
1820–30; < German Pyrochlor. See pyro-, chlor-1

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Encyclopedia Britannica
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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 irregular masses. Tantalum atoms replace niobium atoms in the chemical structure, so that pyrochlore forms a solid-solution series with the mineral microlite [(Na,Ca)2Ta2O6(O,OH,F)]. For detailed physical properties, see oxide mineral (table)

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Pyrochlore is mined mainly by mechanized open pit or underground methods.
Pyrochlore was the principal columbium mineral mined worldwide.
There were no published price quotes for columbium-bearing columbite and
  pyrochlore concentrates.
Thin-films of pyrochlore oxide will be synthesized to quantify the surface
  dissolution in acidic medium.
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