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I think it's a crack but I don't want to pick at it to find out. Looking at how the edge is breaking away along the line it seems a crack. The hone has the earthy smell of a coticule when wet and...

It crossed my mind that it might be manganese deposits and therefore probably natural but then looking at it I decided I thought it was a crack with staining in it. The rest of it just looks so...

I found at a local sale what looks to me to be a "man-made" coticule, meaning the kind made from coticule dust and shaped into a hone with some kind of binder. I've just never actually handled a...