Quote Originally Posted by eKretz View Post
At some angles/views it does kind of resemble one of those Cretan hones.
It does indeed, but from the 4th pic, 1st post with the missing big flakes, the Cretan stone doesn't flake/break like this, it splits into two parts very easily.
BUT you can find this kind of shapes from stones "collected from the wild" i.e. people walking the hill, finding random pieces and sell them (should this happened, it must have been decades ago at least though).
Now, for the possibility to be a stone from my general area, Cretan or "Turkish" oilstone, they are indeed a pain to lap, harder than Charnleys, at least most of them. I have seen a type with completely different characteristics that kind of look again like Turkish oilstone without the presence of pores, but let's not go there as my knowledge is insufficient.
Can you try to generate slurry from it when dry vs wet? Soaked wet stones are a real PITA on that, but it's easier when they are dry, try it with sandpaper.
Also, the pattern with the lines, can you say that it's a result of oil residue, on the dark places, but the white parts have been successfully cleaned from that? Because that could indeed increase the chance for the stone to be one.