Hello everybody I live in Arizona and I have a lot of strange rocks. The ones pictured may or may not have been found in Arizona as they were a garage sale find in Phoenix several months ago. I found these and others at a garage sale in a sandwich bag that was stuffed in a flower pot and both were filled with rocks (some tumbled) and sea glass. When I hold a flashlight underneath them they all three are translucent as well as partially opaque. Any help would be greatly appreciated.