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A piece glued ontop is possible, but it probably just looks that way. The part that was inside the box has clean sides and the portruding top is dark because it was exposed to oil, swarf and slurry,...

Perhaps that was mine, it came in a 14 1/2" box. After searching for your CF I discovered I bought one from him as well :p

Yeah I know him, I found his blog a while back and talked with him a bit. I showed him this forum so he could posts stones from his collection if he was unsure what they were. Apparently he was...

That CF is huge, mainaman, I don't understand how I could have missed it :D How much does it weigh?