Assertion: tungsten | /r/AtLocation | the mineral wolframite
Facets:
value: originally
type: MANNER
Source sentences:
text: Tungsten was originally found in the mineral wolframite.
text: Tungsten is found mainly in the minerals wolframite (iron–manganese tungstate (Fe,Mn)WO 4 , which is a solid solution of the two minerals ferberite FeWO 4 , and hübnerite MnWO 4 ) and scheelite (calcium tungstate (CaWO 4 ).