I went away with the family across to the Lake District for a few days. Walking up the hills I find myself looking at the rocks thinking "I wonder what glaze ingredient that one is" I started seeing whiteish what I assumed were feldspars or possibly quartz so picked up a few to melt in the kiln.
Any ideas what they could be? Sorry for the slightly bad quality, I am slowly learning how to use a camera.
Turns out I can't link so many photos to my post so there are two more in the gallery - http://community.cer.../5048-img-6761/
It's a really beautiful place to go.