Assertion: natural erbium | /r/AtLocation | chemical combination
Facets:
value: always
type: TEMPORAL
value: with other elements
type: OTHER
Source sentences:
text: Erbium is a silvery-white solid metal when artificially isolated, natural erbium is always found in chemical combination with other elements.
text: Erbium is a silvery-white solid metal when artificially isolated, natural erbium is always found in chemical combination with other elements.