Assertion: antimony | /r/AtLocation | native
Facets:
value: sometimes
type: TEMPORAL
Source sentences:
text: This results from the fact that antimony is infrequently found native, but usually combined with sulfur or with heavier metals such as copper, lead and silver.
text: Antimony is sometimes found native, but more frequently it is found in the sulfide stibnite (Sb 2 S 3 ) which is the predominant ore mineral.