Is this rock anything?Found in Waukegan, IL, Lake Mich shore

Hi, everyone, my grandson, age 10, often opens my rock case to look at my moqui ball. We searched for one for him at the rock and gem show, but came up empty. One vendor gave me his card and told me to check with him later. Unfortunately, I went to call him this morning only to find that I had been holding on to the wrong card. Can one of you help me out? Hoping for a Christmas present. :)

I came upon a very large Petoskey and would like to have some "slabs" cut off the back. Does anyone know where I can go to get it cut? I was thinking a marble/granite fabricator but do not know of any in the area. Suggestions?

Hello everyone! We are vacationing in SD in a few weeks near Spearfish. Does anyone know of a few places where we could do some rock hunting?