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By the way, what's the size? Charnley forest stones tend to be longer than 20cm/8". It's not a rule, but you see it more often than in most other hones.

It could be CF indeed. But I have seen stones similar to the appearance that were something else, from UK again I think.
I remember reading on an old book that "the white Charnley stones were...

If I'm not mistaken, and I doubt I am as I had a thorough conversation and testing with an expert about this type of stones, they are from Wales, apparently an old man owns the area (I think), cuts...

From the whole post I guess that's the most interesting part....

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Here in Greece we have a quarry with marble hones (photos). They are actual marble (tested), not chalk, and I don't know how but it contains abrasive particles, SiO2 I would say. It's...

Most of LIs are softer than the Charnleys? From my experience and what others say, it's the other way around, but I will not disagree.
I don't think it's beryl. Looks more like a classic UK hone.

I don't think it is an extremely rare stone, more like just rare. It looks like novaculite, if the white lines on the upper side of the first picture are small cracks, like flaking. I don't think UK...