yttropyrochlore

Etymology
Named after the mineral's supposed yttrium content and resemblance to pyrochlore group minerals

Yttrium + o + pyrochlore

Noun

 * 1)  A discredited pyrochlore mineral containing niobium, hydrogen, and oxygen.

Usage notes
This mineral has been discredited by the International Mineralogical Association. A similar mineral, yttropyrochlore-(Y) was accepted by the IMA in 1977.