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Thanks for the replies. I do not think it is marble as it will abrade well tempered tools as well as any other stone. I have one stone that I am sure is a LI and they are nothing like these, not hard...

trouble is the postage will be $90:tu

I now somehow have 2 of these stones and have not been able to find any information on them anywhere. I would say they are rather like the DT in feel and grit, but not the finest finishers, but...