I have a natural hone I bought online some time ago (many 2 years) and I don't know what kind it is.
It is a fine hone, I have used it as a finisher even though it is so small... It gives a wonderful edge! and the size is perfect to travel with...
It is hard, not as hard to lap as a Tam O'Shanter, but it feels har. And it absorbs a little bit of water, but very little compared to other naturals I have experienced.

The pic has a razor to compare the size to...
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When I got it, it was glued to a small paddle strop, but that was old and broke quickly.

Any ideas what it might be?

Thanks,
Jacke