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That's very interesting indeed.

The images taken under a microscope that I've seen on that coticule / Ardennes website did not show a particular cristal shape from what I remember, but then again...

Surely the Norton hones are 4000 and 8000 grid according to the CAMI or FEPA standards? The coticule is a natural stone and as such I would imagine its abrasiveness to be somewhat variable. Could...