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Thank all of you guys for sharing your knowledge. I have learned a quite a bit. I am still not sure what it is but I have some ideas of what it might be.

Charlie

My guess would be clay, The stone powders when dry sanding it on sandpaper. I would say it was closer to soft than hard. I know my answers are vague but thats the best I can guess.

Charlie

I bought this stone at a antique store. Here are some pictures of my new stone between to my hindostan (I think it is a hindostan) and a coticule. I am trying to figure out what the stone in the...