Assertion: gold | /r/CapableOf | occur as sylvanite
Facets:
value: sometimes
type: TEMPORAL
Source sentences:
text: Gold sometimes occurs combined with tellurium as the minerals calaverite, krennerite, nagyagite, petzite and sylvanite (see telluride minerals), and as the rare bismuthide maldonite (Au 2 Bi) and antimonide aurostibite (AuSb 2 ).