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pyrochlore

[pahy-ruh-klawr, -klohr] /ˈpaɪ rəˌklɔr, -ˌkloʊr/
noun
1.
a mineral, chiefly composed of niobates of the cerium metals, occurring in syenites in the form of brown crystals.
Origin
1820-1830
1820-30; < German Pyrochlor. See pyro-, chlor-1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for pyrochlore
  • pyrochlore is mined mainly by mechanized open pit or underground methods.
  • pyrochlore phases are attractive for this application for several reasons.
  • 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.
  • Niobium-bearing minerals, especially pyrochlore and niobium-bearing rutile, may be abundant.
Encyclopedia Article for 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)

Learn more about pyrochlore with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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