Assertion: tellurium | /r/HasProperty | obtained
Facets:
value: from sylvanite
type: OTHER
value: from the ores calaverite
type: LOCATION
value: from krennerite
type: LOCATION
value: by repeating the process
type: MANNER
Source sentences:
text: Tellurium of higher purity is obtained by repeating the process involving the tellurides.
text: Tellurium is obtained from the ores calaverite, krennerite, and sylvanite.