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Egg looking rock?


littlejetties

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Found this on a sandy bank of the St John's river in NE Florida.  

Thought the interesting cracked "shell" appearance was worth inquiring about. 

Thanks.

20170302_133606.jpg

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I take the liberty to crop your picture for a better view. :)
The outer layer has an interesting pattern.

 

20170302_133606.jpg.eb5ba5b9d316b7888325d598272ccdfd.thumb.jpg.01c2934de7cb314e8d587c219872ca97.jpg

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Here's both sides.  I'm inclined to think it's just mud cracks, turned stone, and tumbled smooth.

IMG_20170302_145317.jpg

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I think this is a geologic stone, that developed cracks, and had minerals seep in to keep the cracks opened. :unsure: 

Definitely not a egg. 

Possibly a concretion.

The cracking often happens with the outer "rinds" of concretions.

Regards, 

    Tim    -  VETERAN SHALE SPLITTER

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