Amethyst Stalactite Slices are very rare and they are only found in Uruguay. Slices are cut and polished from columns of amethyst ( stalactites) that developed millions of years ago inside amethyst geodes.
Amethyst geodes started as gas pockets in hot boiling lava where fluid silica and iron particles found their way inside to give the Amethyst it's purple color. When the lava cooled off, the silica trapped inside formed the quartz crystals. 50 million years or so later, amethyst geodes are now mined from very hard lava basalt.
Fordite orDetroit agate,
Fordite, also known as Detroit agate, is old automobile paint which has hardened sufficiently to be cut and polished. It was 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. The old factory methods that created this incredible material are long gone.