Assertion: fluorine's compound | /r/HasProperty | rare
Facets:
value: in nature
type: LOCATION
value: extremely
type: DEGREE
value: naturally
type: DEGREE
Source sentences:
text: Natural organic compounds that contain fluorine are rare because living organisms -- with a few exceptions -- do not produce them.
text: Naturally occurring organofluorine compounds are extremely rare, yet man-made fluoride compounds are common: for example, twenty percent of all commercialized pharmaceuticals contain fluorine, including Lipitor and Prozac.
text: Because organofluorine compounds are rare in nature, the fluorine atom would be in the form of the fluoride ion as a source (like sodium fluoride).