Thanks again, folks. NC field hunter, I do not know my minerals and stones....sorry. I have wondered if it might be petrified wood......highly polished......isn't there what they call agatized petrified wood? If it's jasper, well I just don't have a clue. I have seen a few discoidals (always called them chunky stones), but nothing that was this polished. I looked at several websites after rock suggested a bit of research, and did see other very nice, polished pieces. I hate to even ask this question, but would anyone have an idea as to its value?