Wow! 40 years! Did the metal splinter bother you?
You are right about safety though, a piece of the metal sledge broke off and struck my safety glasses. If I kept up my efforts to break the Jade then I was going to be taking more damage than the stone...
A while back I broke a big piece of Leland Blue slag glass (for Photo #132) and the piece exploded violently and the glass shards went through my leather gloves like tissue paper-it was a bloody mess. I thought I pulled all the glass out of my hands, but, I missed one and it is still in the joint of my finger. I have a circular scar nodule that formed around it-and it does not bother me, even when weightlifting.![]()