Wow, a lot of technical stuff there. Well, techy for me. It would be nice to find some quantifiable way of determining what is what between stones. I guess it would still not matter since the end user will always have a subjective experience of a stone. Quantifying would also lose the mystery of each stone. I mean isn't that part of the mystique with naturals. It goes beyond a chart or gradiation, leaving the visceral component left. The exploration of steel and stone. The adaptation of skill and knowledge to an unidetifiable component that is found in each natural.