Mill Creek Valley, Ochoco Mtns, Crook County, Oregon
Additional information can be found at Hinkle's Rock Shop: www.oregonthundereggs.com
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Rough Appearance: Small with raised ridges, sometimes with greenish tint.
Mostly quart core, but can come with banded agates sometimes with shadowy effect.
the dentrites along waterlines of the left pair.
I call it "Polar Express" train. It looks like the train's
emerging out of winter fog along snow.