Assertion: osmium | /r/HasProperty | precious metal
Facets:
Source sentences:
text: Osmium is a precious metal.
text: Osmium is both the rarest precious metal as well as the rarest existing element.
text: Osmium, the densest of all metal elements, is a precious metal found in the platinum group.
text: Osmium is a precious metal.
text: Osmium is extremely expensive (it is a precious metal), and 2.