A xenotime is a variety of yellow-brown mineral, also known as yttrium phosphate.

Xenotime is pronounced as "ZEE-noh-tym." The emphasis is on the first syllable.

The minerals containing erbium are xenotime, euxenite, monazite, gadolinite, some clays.

Ytterbium is obtained from other rare earth elements in several rare minerals, gadolinite, monazite and xenotime.

Dysprosium is found in the minerals xenotime, fergusonite, gadolinite, monaziate, and bastnasite. More commonly in monaziate and bastnasite.