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Shale/slate are quite common material for sharpening stones, the best way is to choose one piece (which is as flat as possible) to lap it and to run a blade over it :)

Regards
Philipp

Yet another one lost guy which has found his new home in my shelf.

a Basalt-Bout, haven't give it a name yet (is that strange?) :D

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Have taken it from a lake in Saxonia, pretty sure it...

Here my another hounded exemplar :)

Its name is "Green Tiger" :) check that out:
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(the surface is whet).

I've found it in my city in one of neighbours garden :D
No clue where it came...

This is my "Allgäu-Slate" :rock: ...

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I've found it in the bavarian mountains, the region "Allgäu".
It was laying around on the walking way together with stones which seemingly were...