AKA Larsonite and McDermitt Geen Jasper. This rough has incredible colors. It is actually wood, algae, mud and other swamp vegetation that was covered by volcanic ash between and 11 and 14 million years ago. Water carrying minerals seeped in creating the green color while it petrified. Polishes very nicely. -WET pic.-(4"x 2"/2.8 oz./5mm thick) sealed fractures... great cutter
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