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That is one pretty hunk of stone ! I'd keep that whether it worked for razors, knives or not.

Tom I have a limited, to say the least, knowledge of geology but it seems that quartz or garnet are the usual abrasives in hones that are well known for their effectiveness in sharpening and...

I don't know about the one in the data base. I just did an advanced search for "jade" under hones and came up with a few threads where the word was used in passing but no jade hones. Send a PM to A_S...