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Yes, I agree, looks very like Modines stone.

There are a lot of different types though, FWIW. They vary a lot both in colour, texture and effect - some can be quite coarse, for example, some very...

That rules WOA and WOS out then, Maxim - and just goes to show how difficult it is assessing hones by pictures! I did try the standard MOHS test on CF and Turkey stones, but could detect no...

Those sparse and well spread little dots on the first one are very reminiscent of water of ayr stones - they may look superficially like thuringians. They give a 'silky' feel according to the box...