Pota Mara

'Pota mara' is a big white marble. When I was a kid we used to call them that way. I have no idea if the name persisted and I don't know where it came from. We all liked them and traded them for at least three or four regular marbles. You could win a lot of marbles if you offered your Pota Mara as a target. Kids would try to hit it at least five times leaving you with that many marbles. A Pota Mara was a well of riches.