Assertion: mineral bornite | /r/HasProperty | written as 2(cu 2 s)cus.fes
Facets:
value: to show
type: PURPOSE
Source sentences:
text: The mineral bornite (Cu 5 FeS 4 ) is an important source of copper and its composition can be written as 2(Cu 2 S)CuS.FeS to show that copper in the mineral occurs in both monovalent and divalent states.3