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There is a lot of info in the "natural stone mystery" thread. I have read it a number of times.

Interesting observation on the sealed edge. It seems that 330mate has a bunch of second hand stones...

Maplelite - I think all the hones are likely to need lapping. If you are considering returning it, I wouldn't do anything to the hone until you settle with the seller. If you lap it, it is yours.

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