Might need to get some agate slabs at the next gem show! Artist Polke Sigmar's Agate Stone Windows designed for the Grossmünster in Zurich. Sigmar produced 7 cathedral windows made from translucent Agate found around the world.
"This is an advanced form of stained glass, where I use antique/vintage glass inclusions in each piece. All individually foiled and soldered with classic stained glass as the background. I also recycle old window sashes to use as my frames"