Assertion: chalcedony | /r/CapableOf | preclude proper coverage
Facets:
value: in this article
type: LOCATION
Source sentences:
text: Agates and Jaspers are patterned chalcedonies that are a whole study themselves, and are so diverse as to preclude proper coverage in this article, so for in depth information on them, the best book on the subject in this writers’ opinion is Agates and Jaspers by Ron Gibbs.