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Feldspar crystal w/ concentric zones, Scaup Lake lava flow Yellowstone

By Yellowstone Volcano Observatory 2018 (approx.)
Crystal with concentric zones, like tree rings, that was found within the Scaup Lake lava flow.
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Crystal with concentric zones, like tree rings, that was found within the Scaup Lake lava flow. This image was taken with a special microscope at Arizona State University that highlights differences in the chemistry of the different parts of the crystal.

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Public Domain.

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