Assertion: chalcocite | /r/HasProperty | important copper mineral
Facets:
value: economically
type: MANNER
value: in the world
type: LOCATION
Source sentences:
text: Chalcocite is an economically important copper mineral.
text: Chalcocite is an economically important mineral of copper.
text: Bornite (Cu 5 FeS 4 ), covellite (CuS) and chalcocite (Cu 2 S) are important sources of copper in the world and many ore bodies also contain some malachite (CuCO 3 .Cu(OH) 2 ), azurite (Cu 3 (CO 3 )2.Cu(OH) 2 ), cuprite (Cu 2 O), tenorite (CuO) and native copper.