Limestone and Cedar

Feldspar

Right now I get my feldspar in a super sack of over a 1000 pounds and it looks like cat litter.

It comes out of North Dakota and it`s a blend of different veins. The reason why I get that is because it`s just pulverised rock; it hasn`t been washed, it hasn`t been de-ironed and they haven`t pulled out the impurities. It glistens with mika, pink granite, and obsidian. When you get a bag of commercial feldspar it`s gone through a lot of refining before it`s crushed and they crush it to a point where it`s 200 mesh or finer. That makes a particular kind of glaze that we are really used to looking at, it`s very uniform. Now, this makes a good glaze but I`m interested in what happens when you are not refining the feldspar as much. I started noticing this when I would study rice ash glazes at the Freer Sackler Museum.

I use a Hammer Mill to take the coarse stone down to about a 60 mesh
Then I use a Ball Mill to take materials from the 60 mesh downwards
Drying feldspar after ball milling
Finished feldspar – note the coarseness of the material