That looks like a St Laurant which can be similar in polishing to a Nero Marquina.
It is a soft and sensitive stone and polishes up to factory or better.
Just take your time with it and you will be fine,

Sent from my iPhone

On Feb 16, 2015, at 9:49 PM, "Roger Konarski (via sccpartners list)" <> wrote:

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  I was looking for input on polishing this stone to factory. Is this a easy or a tough stone to restore and pop nice glass clarity. Please see the attached pictures.
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