I was given this the other day from a friend. i havent used it yet, only had time to lap it and try to clean it. I will try it out this weekend, but i am a little confused as to what stone it is. Sorry the pics arent great,Attachment 93287Attachment 93288Attachment 93289Attachment 93290 but it was the best i could do at 12am at night. Any help would be appreciated, thanks!