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A.k.a., Gary Green Jasper and Larsonite. 14 million years ago, Yellowstone was under Oregon, near what is now the town of McDermitt, and an eruption covered swamp vegetation and mud with ash. The colors are from iron, aluminium, potassium, sodium and calcium.
This end cut's other side gives you an idea what the petrified swamp bog looks like before it's polished. It measures 180x120x34mm and 576g.