from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A cerium fluoride mineral found in Sweden.
from The Century Dictionary and Cyclopedia
- n. A fluoride of cerium and the allied metals, occurring massive and in hexagonal crystals in Sweden and Colorado (tysonite). It is often altered to a fluocarbonate called bastnasite or hamartite.
It also occurs as phosphate in monazite, and as fluoride in fluocerite.