Assertion: chalcopyrite | /r/HasProperty | yellow mineral
Facets:
value: historically
type: TEMPORAL
value: sometimes
type: TEMPORAL
value: with the chemical composition
type: OTHER
value: with copper iron sulfide
type: OTHER
Source sentences:
text: Chalcopyrite is a brassy yellow mineral with the chemical composition CuFeS2, or copper iron sulfide.
text: It was sometimes historically referred to as "yellow copper".