SIZE: Medium Organic Oval. BLACK CHALCEDONY is a translucent agate. From Brewster County, TX, these are a new Local Stone favorite. With its combination of black & blue chalcedony and clear agate, it’s hard to find any other stone in the world that has such unique patterns. It’s like modern art in space. With its geometric 3D patterns appearing as they are floating (or exploding) in dark space. It has the spiritual qualities of stars and the deep heavens, making these stones of high magic and spirit. They emit the aura of deep imagination and creativity within a perfect elegance. It’s worth it to magnify the photos of these stones just to see their unmatched radiance and charm. These are premium Local Stone one-of-a-kinds!