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Funny thing about the Cretan (Turkish?) oilstone : it was indeed a Turkish oilstone until about 1913. Then Crete became de jure part of Greece.

Another good example for stones that thought to be...

Unfortunately, we can't assume that any layered novaculite stone that comes from Canada is a Magog oilstone. The same way, I'm sure that Turkish oilstone in it's majority comes from Crete, and that...

There is also a chance that many of the Hindostan stones that appear above, or anywhere in that matter (without means of identification like a label), are from Canada. And, I think there are more...