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If you mean what's visible in the 7th photo, what I think I see there at the right is a scratch on the edge that extends over bother layers but does not reach the surface of either, and slightly to...

A lot of coticules have what appear to be cracks in them, but in most cases they're from when the sediment was laid down and they've been filled with inclusions and can't be felt - I have one with...

Natural combo without a doubt (or at least, very little doubt) - nice price too!