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What is this?!?!

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I got this from an auction when a natural museum closed down. It was in a lot box that I had bid on and won. Any information would be helpful. This picture does not do it justice. The brown in this image is actually more of a red. I was told it's some sort of crystallized coral. Someone also said it could be river opal. I have no idea. Please help. Thanks.

asked Mar 5, 2017 by Talltalltimbers (120 points)

1 Answer

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Looks like a concretion, or a geode which ground water has seeped into and crystalized. The crystal could be quartz, chalcedony, agate...
answered Apr 4, 2017 by Weasel (51,170 points)

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