Assertion: chalcopyrite | /r/HasProperty | primary ore of copper
Facets:
value: with present
type: OTHER
value: with chalcocite
type: OTHER
value: with some covellite
type: OTHER
Source sentences:
text: Chalcopyrite has been the primary ore of copper since smelting began over five thousand years ago.
text: Chalcopyrite was the primary copper mineral with some covellite and chalcocite present.
text: Chalcopyrite is a primary source of copper.