Assertion: chalcedony | /r/HasProperty | diverse
Facets:
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.
text: Chalcedony is fun to collect, since there are so many varieties.