>The material is irrelevant.
It's wasn't to the ancient Egyptians...... it can't be finely carved and polished unless the rock is a hardrock (i.e. high fracture strength).
>To prove your point.
I asked you to prove yours first....... why is this andesite porphyry example of yours beyond Stock's proposed method? Remember you believe the "material is irrelevant".........
>No need to even consider "Meta-Andesite, feldspar phenocrysts"
Do you even know what they are..... since I would love to hear your explanation as to how they got cut on the surface?
>If you are demonstrably successful, we can then apply your
>technique to harder materials.
Oh so now the material is relevant.... why is andesite porphyry so hard (i.e. abrasion hardness) it cannot be shaped by grinding with quartz?
>No I do not have a photo of the consistent wall thickness
Where are you getting that previous claim from then...... the one claiming a "constant wall thickness of only a few mm" for narrow necked vessels?
Archae Solenhofen (firstname.lastname@example.org)