Assertion: chalcedony | /r/HasProperty | a microcrystalline quartz
Facets:
Source sentences:
text: Chalcedony is a microcrystalline quartz.
text: Chalcedony is a microcrystalline quartz.
text: Chalcedony is a microcrystalline quartz whereas aventurine is a crystalline quartz with small inclusions of other materials.