What is it? An Odd Geode?

[641Rlucas]

Hi all!

Iowan here, Found this geode-like rock in a creek in Eastern Iowa.... very unique top and bottom though, anyone have any idea of what it is?

Hoping my images loaded!

 

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[BridgetownTreasures]

Welcome from the Pacific Northwest! Very cool piece!

 

[641Rlucas]

Welcome from the Pacific Northwest! Very cool piece!

Thanks, first time. I have other geodes, but just think the top of this is so odd, been racking my brain on the outside, and the odd shape of the inside

 

[Steve1236]

That is a cool piece, I'm curious to is if will fluorescence under uv light? The outside is neat looking, maybe it's a fossil type geode like this one I found in payson Az.

 

[DDancer]

Not a geode but a vuggy chunk of quartz shelf. Vugs are hollows inside of their host material and often area's where crystals will form. The banding is due to different times of mineral formation, like tree rings, and when the solution ran out the last batch of crystals that formed were left lining the vug.