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I've tried several of my slabs on knives. The Kentucky hornstone, quartzite and a banded, unknown variety all will definitely cut steel with water and no slurry. they all remove steel rather slowly...

I've seen this mentioned on the forum before, but you can find all kinds of stone already sawn into slabs on ebay and at "knap-ins" where like minded knappers congregate and swap and sell rock. Most...

I have some quartzite sawn into slabs. Haven't tried it yet as a hone.