Quote Originally Posted by ppetresen View Post
For the large triangular one I actually would have guessed La Dressant Upper Layer but it sounds like you've maybe excluded it already. Still, as Kees pointed out there is lots of variation between stones of the same layer and La Dressant is a particularly diverse layer.
I was not aware stones from La Dressante layer may have such grainy surface.
From what I know the appearance within one layer is quite similar to all stones but their sharpening properties (speed on slurry/water, fineness) may vary.
But I don’t own a large number of specimens from any layer to being able to be certain on that.