Assertion: cryolite | /r/ObjectUse | used as active filler
Facets:
value: in grinding wheels
type: LOCATION
Source sentences:
text: Cryolite is offered in two sizes; Cryolite Powder or Cryolite U/F. It is a synthetic mineral that closely approximates the performance of natural Greenland cryolite and is used as an active filler in grinding wheels.