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I'd agree, it doesn't appear to be hard in the sense that a translucent or black stone is - it looks a bit shy of that in density. If it's not a soft arkansas, it could still be conditioned to finish...

What brand of hard do you have? Or what type?

Is it translucent or black? If not, it may be a newer grade hard (which is really not up to par with vintage stones or some of the newer stone cutters...