🔎 UNIDENTIFIED Found in a creek in West Des Moines, IA a couple years back. I know next to nothing about rocks and have no clue what this could be.

[Dooodyoursmart]

 

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[Midden-marauder]

Cool rock, no idea but it's a sweet find!

 

[Moesia]

Nodule

 

[Bucket Lister]

It's... metamorphic. A few different things going on there. I believe the yellowish part is older than the whiter part, the yellowish having cracked and later filled in by the lighter material.

Could be really pretty if it can survive tumbling! 😉

 

[VickyRenee]

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This looks kind of like a septarian rock.