These beautiful specimens are rare survivors of a small find that produced GREAT carving rough for cabochons and jewelry made of chalcedony (its gemmy and transparent/translucent!), to the detriment of the original specimens from our point of view! Charlie saved some from the wrecker, though, and these are a few selected from a flat we have of this rare and beautiful old material from the 1980s. This one is particularly nice because it is a good-sized plate with excellent translucency and good horizons abou the edge. In person, you'd displayit set down a bit, to better show off the crystals!