Fordite, also known as Detroit agate, is actually old automobile paint which has hardened sufficiently to be cut and polished. It was formed from the build up of layers of enamel paint slag on tracks and skids on which cars were hand spray-painted (a now automated process), which have been baked numerous times. In recent times the material has been recycled as eco-friendly jewelry.
Things like this piece of Galaxy opal are proof of God for me. I don't think it's a coincidence that this thing formed on the earth, yet looks just like the galaxy above the earth.