almost any stone or other abrasive material will work fine for sharpening. you might even be able to get it shaving sharp if you have a way to remove the burr...something like alot of stropping on some pants would probably work fine.
I always wear a belt, so I usually use it to strop a knife, and since most of mine are Carbon, I can use just about any stone - I always get them to shave, the carbon steel is easy to sharpen, hence it is the perfect outdoor/survival blade.
Slate, mudstone and shale split very nicely into flat sheets. All are good for light grinding, especially slate. The other two can be a little soft at times.
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