These are secondary crystals shapes which formed in my glazes during the winter of 2007-08. I’d never noticed these in my glazes prior to this time period, and thought that some were faults due to colorant impurities, insufficient sieving of the glaze, etc.
The crystal in reference here is the darker blue one:
These are some of the first ones I noticed, with mostly perfect triangular shapes –these particular crystals did not show until after the glaze was reduced:
This one is like a kaleidescope. It also reminds me of the water crystals photographed by Dr. Masaru Emoto:
These two formed rectangular shapes:
I’ll be updating with more info and images as they come…