First of all, Agate and Chalcedony are different names for the same thing. An agate is made of chalcedony. Since most agates are different colors and have different inclusions the whole rock is called an agate. But if you have a clear agate with no inclusions you might want to call that a piece of pure chalcedony. And Chalcedony is a micro or cryptocrystalline form of Quartz. Jasper, Chert, Flint, and Agate are all different formations of Quartz. Bloodstone is a Jasper. Opaque unless cut very thin.

This is another very pretty piece. The colors remind me of Texas Plume agate. I think the internal structures would be called plumes, rather than moss, by most folks. Nice find.

Oops Joe you forgot to add the picture.