I was told this comes from a Madagascar River basin with a long name that didn't work well as a "rock name" so Mad River Agate is another name given to it. Anyway, it is found as waterworn agate and can have great fortification as well as dendrites. This slab has great white fortification with very nice black dendrites. -WET pic.-(3"x2"/1.4 oz./5mm thick)no issues..perfect cutter
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