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You can check this thread
http://straightrazorpalace.com/hones/77212-help-id-natural-hone.html

I am sorry that all my pics links are gone in old posts since the service provider deleted my...

With brown he probably mentioned purplish, they look brown then and on pictures they look Grey.
I have old fine UK stones like that, with some Green impulses on a few of the stones.

Good stones...