I like how GreenMan’s eyes evoke a more traditional style of mosaic, with smaller tesserae and grout used to fill the interspaces. The grout adds some depth and detail, as in real eyes. The irises are made of malachite. I had to buy display pieces from local crystal shops (there are oodles in Asheville) and slice them down and break them to create the tesserae. I ended up doing them twice. The first time around I made one eye from a single piece of malachite. Doing that I figured out that it would work, so I got another piece. But it was a slightly different hue. I don’t know if anyone else would have noticed the two eyes being slightly different, but I couldn’t let it ride. The source malachite is now well blended between the two eyes.
The whole mosaic is natural stone. Most of the materials are regionally sourced. Lots of stone from North Carolina and Tennessee, though Georgia, Pennsylvania, and New England are also represented. The malachite in the eyes is one of the few materials sourced from an exotic locale. I’m not sure exactly, but I believe it originated in Africa.