Assertion: cerium | /r/HasProperty | found as a trace element
Facets:
value: in several minerals
type: LOCATION
Source sentences:
text: It is found as a trace element in several minerals, but only two, bastnasite, LnFCO 3 , and monazite, (Ln, Th)PO 4 (where Ln = a lanthanide element, such as lanthanum, praseodymium, neodymium, or cerium), which are approximately 30 percent and 22 to 25 percent cerium, respectively, are the principal sources of this element.