Assertion: chalcedony | /r/HasProperty | sio
Facets:
Source sentences:
text: Fire agate is a type of chalcedony (SiO 2 ) which contains multiple, extremely thin layers of the iron oxide minerals of Goethite (FeO(OH)) and Limonite (FeO(OH)·nH 2 0) imbedded within, and commonly completely enclosed by, semi-transparent to translucent layers of cryptocrystalline chalcedony.