Paul,
Thanks for the science info on the pottery side of this. I've done quite a bit of research into this as well, but my knowledge base is still quite weak in comparison. I knew these were crystalline structures, what's amazing to me is the variability, I guess from different cooling rates, minerals, Ect. What's awesome to know about the Tofukuji pots that feature this glaze, is that they were all fired in either a friends kiln, or the local public kiln. No control over placement or cool rates...
Ryan