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Yes it is a finishing stone. Grit is not really possible to tell you as it is a natural stone

Then I am going to same probably a translucent ark.

I would go back to the barber and ask him if he used oil, water, lather or spit on that hone. And then you should do the same.

As to...

If it is a translucent ark it will be good for your razors. I am just not sure if it is an ark

Does it feel smooth on both sides or is one side rougher