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Is this a geode?

Ccook06
in Earth Science

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Hello,

I am looking for some help identifying a rock found by my father in Eastern Montana. It is roughly the size of a football and weighs almost 10lbs. It resembles a geode but it has no crystals and is quite smooth throughout the center. This rock has not been cut, it is hollow all the way through. Any help is really appreciated! Thanks!

 

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  • 1 month later...

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