Fordite: a rare mineral only found in old Detroit auto-painting facilities

"Fordite" is an anthropocenic mineral "formed from the built up of layers of enamel paint slag on tracks and skids on which cars were hand spray-painted (a now automated process),…

"Fordite" is an anthropocenic mineral "formed from the built 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."
(via JWZ)