If you were really into gift shops as a kid, you probably loved to look at all the shiny geodes. But those little geodes are nothing compared to the mother of all geodes, found is in Put In Bay, Ohio. So let's talk about how this geode formed and the gorgeous sky-blue celestine crystals that we find inside it.

Correction:
0:38 Oops! "Lake Erie" is spelled incorrectly here.

Hosted by: Hank Green
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Sources:
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