Some more small unknowns and my trusty Coticule, old, hard, won't slurry by it self and a natural combo, nice!
The one on the left is the finer of them but no way close to the stones above.
The right one is not as fine, almost gritty but these two used in progression is a good deal, fast and gives a nice edge.

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All pics bigger in this link; imgur: the simple image sharer