Thread: Not exactly a hone but maybe

So I was in the local craft store looking for something else and happened to slot this bag of what looks like sectioned black river rocks.

I've seen them uncut in landscape applications and wondered if any of them might be usable for honing (does this sound like a sickness to anyone else?)
None of them are very large but I have acquired a fondness for narrow stones lately.

Perhaps a small palm stone???... anyway the whole bag was $4.99 plus sales tax so I figured if it doesn't work out I'm not out much.
Anyone else ever try some harebrained idea like this?