Assertion: lignite | /r/ObjectUse | used in various types of jewelry
Facets:
Source sentences:
text: Jet is a hardened, gem-like form of lignite used in various types of jewelry.
text: Jet is a hardened, gem-like form of lignite used in various types of jewelry.
text: Jet is a hardened, gem-like form of lignite used in various types of jewelry.