This hunk APPEARS to have been cut, maybe not, it might have sat against something smooth for ages. I find many oddities from the lake people say shouldn't be there lol. I tried the magnet test, it has a very slight pull in some spots but the magnets do not stick or stay anywhere on it. The weight is "unnaturally" heavy for a a stone of egual size. It is extremely heavy. I took it to a gemologist today but he wasn't in so have to go back tomorrow.