Assertion: carnotite | /r/HasProperty | mined for radium
Facets:
value: in the early 20th century
type: TEMPORAL
value: at times
type: TEMPORAL
value: almost exclusively
type: DEGREE
Source sentences:
text: For years carnotite was mined almost exclusively for its vanadium and radium.
text: At times in the early 20th century, it was mined primarily for radium or vanadium.