Finance, Forex and Investments

what is this small black square rock thats been named indian money?

I am from north carolina, as a child my father would take us camping and we sometimes would go on the search for "indian money" .its a small square black rock, i dont know what it is ,if it forms naturally like this or if it was used as money. i recently took my 2 sons to scout camp and found myself searching for it with them. we found some nice ones. what is this stuff?

Public Comments

1. I have no idea what it is but I can guarantee you it has nothing to do with Indians, but actually with the Native people of north america. Just to clear the whole 'indian' thing up.
2. Black shale? Obsidan...?