Meaning of pyrochlore

py•ro•chlore

Pronunciation: (pī'ru-klôr", -klōr"), [key]
— n.
  1. a mineral, chiefly composed of niobates of the cerium metals, occurring in syenites in the form of brown crystals.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.