This is about the size of a large marble. I found it a couple of weeks ago at my dig site. I forgot it on the table and brought it home yesterday. Could be a leaverite on the porch.
Id call it a game ball seeing it is small. I think some call the large ones hammer stones. But if they are polished I wouldnt think they would use them as a hammer.
Thanks for the replies/views. My camera is broken as I usually take pics of hammerstones and oddball stuff at the site. But this was small enough to chuck back.