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You do have a point. How hard is this stone? Mine, the one I was saying it looks like this one, is the hardest stone I have ever seen. The back side of the stone was rough, and it looked more like...

Looks like a Llyn Idwal (UK). I have one that looks like yours. With the 1/10th of its thickness. For me, it works best if it's lapped to a very fine degree, 5000 grit sandpaper or higher. Really...