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The gravity test would only let you check the grade of novaculite if that is indeed what it is. There are plenty of other rocks that will have similar density.

Novaculite is one of the odd rocks....

I don't think it's a Moughton if it's improving an 8K edge. That stone is reputed to be a mid grit stone. I was going to go hunt for some a few years ago. I got to the site but found the location to...