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If I'm not mistaken, Gsssson is talking about Carbon Tetrachloride or maybe Trichlorethylene Shouldnt damage the stone at all, but will certainly damage the lungs, liver, and braincells!

The purpose of the thread is to identify the stone and density is a tool in the box of knowledge to help with that. I had no clue slate had that density. The more I read the more I am convinced it...

So, if the numbers ARE accurate, the stone in question could very well be of the Special Stone variety. I have never had an Ark stone above 2.67

Thats a mighty high density there. By looks, I would say a surgical black Ark, but I have never encountered one of that density.

Perhaps it was one of those "For Good Razors" hones? ...