I can't get the right sand paper at this time, so I used what I had right now a cutting wheel and P60 paper. This is what I got. It's about the same on the inside as it is the out. It did leave a whitish gray color tho. Sorry about my spelling and punctuation I have been busy trying to multi task and I'm running on no sleep from last night. I really don't know much about this. And haven't had time to study more about it.
Should I still sand it down with finer sand paper, send a pic to a university or do you think it's just a weird rock.