This is technically not a fake or a forgery. The real offense here is the intent to pass car paint off as a mineral.
It is NOT an agate and not approved by the IMA. In short, it is car paint, really. Some entrepreneur decided to take advantage of its beauty and recycle these slabs of car paint. They even go as far as to say the mines are dry. I am sure it is tongue in cheek.
So how is it “made”?
http://fordite.com/Home_Page.html shares the process, “The over sprayed paint in the painting bays gradually built up on the tracks and skids that the car frames were painted on. Over time, many colorful layers built up there. These layers were hardened repeatedly in the ovens that the car bodies went into to cure the paint. Some of these deeper layers were even baked 100 times. Eventually, the paint build-up would become obstructing, or too thick and heavy, and had to be removed.
As the story goes, some crafty workers with an eye for beauty realized that this unique byproduct was worth salvaging. It was super-cured, patterned like psychedelic agate, and could be cut and polished with relative ease!”
Is it pretty? sure! Each piece has a unique set of colors and patterns. Is it a mineral or crystal? No.