About 1.5 feet tall, 1 foot deep and 2 foot wide. Very heavy and very hard. I will get a better picture posted asap. You can read a newspaper thru it. Was left to me by my uncle years ago but never told me where or how he got it. I'm desperate to know what it is and why he kept it so long. Please help. Thank you.
I should also add that I am from South Dakota but I can't tell you for sure that's where it was found.