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Thanks guys, good to know there are other natural stones working like this. It struck me as weird since the stone colour is a greeny/blue, but when you rub it with a diamond plate you get this thick...

Does anyone know of any natural hone that produces a red-ish/brown slurry? I ask because I have a natural stone that's doing the job of honing very well, but the slurry colour is redish brown, due to...